Merge branch 'oprofile-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'oprofile-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: oprofile: select RING_BUFFER ring_buffer: adding EXPORT_SYMBOLs oprofile: fix lost sample counter oprofile: remove nr_available_slots() oprofile: port to the new ring_buffer ring_buffer: add remaining cpu functions to ring_buffer.h oprofile: moving cpu_buffer_reset() to cpu_buffer.h oprofile: adding cpu_buffer_entries() oprofile: adding cpu_buffer_write_commit() oprofile: adding cpu buffer r/w access functions ftrace: remove unused function arg in trace_iterator_increment() ring_buffer: update description for ring_buffer_alloc() oprofile: set values to default when creating oprofilefs oprofile: implement switch/case in buffer_sync.c x86/oprofile: cleanup IBS init/exit functions in op_model_amd.c x86/oprofile: reordering IBS code in op_model_amd.c oprofile: fix typo oprofile: whitspace changes only oprofile: update comment for oprofile_add_sample() oprofile: comment cleanup
This commit is contained in:
Linus Torvalds
commit
526ea064f9
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@ -6,6 +6,8 @@ config OPROFILE
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tristate "OProfile system profiling (EXPERIMENTAL)"
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depends on PROFILING
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depends on HAVE_OPROFILE
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select TRACING
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select RING_BUFFER
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help
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OProfile is a profiling system capable of profiling the
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whole system, include the kernel, kernel modules, libraries,
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@ -65,11 +65,13 @@ static unsigned long reset_value[NUM_COUNTERS];
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#define IBS_FETCH_BEGIN 3
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#define IBS_OP_BEGIN 4
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/* The function interface needs to be fixed, something like add
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data. Should then be added to linux/oprofile.h. */
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/*
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* The function interface needs to be fixed, something like add
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* data. Should then be added to linux/oprofile.h.
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*/
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extern void
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oprofile_add_ibs_sample(struct pt_regs *const regs,
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unsigned int *const ibs_sample, int ibs_code);
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oprofile_add_ibs_sample(struct pt_regs * const regs,
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unsigned int * const ibs_sample, int ibs_code);
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struct ibs_fetch_sample {
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/* MSRC001_1031 IBS Fetch Linear Address Register */
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@ -104,11 +106,6 @@ struct ibs_op_sample {
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unsigned int ibs_dc_phys_high;
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};
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/*
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* unitialize the APIC for the IBS interrupts if needed on AMD Family10h+
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*/
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static void clear_ibs_nmi(void);
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static int ibs_allowed; /* AMD Family10h and later */
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struct op_ibs_config {
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@ -223,7 +220,7 @@ op_amd_handle_ibs(struct pt_regs * const regs,
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(unsigned int *)&ibs_fetch,
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IBS_FETCH_BEGIN);
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/*reenable the IRQ */
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/* reenable the IRQ */
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rdmsr(MSR_AMD64_IBSFETCHCTL, low, high);
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high &= ~IBS_FETCH_HIGH_VALID_BIT;
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high |= IBS_FETCH_HIGH_ENABLE;
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@ -331,8 +328,10 @@ static void op_amd_stop(struct op_msrs const * const msrs)
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unsigned int low, high;
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int i;
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/* Subtle: stop on all counters to avoid race with
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* setting our pm callback */
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/*
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* Subtle: stop on all counters to avoid race with setting our
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* pm callback
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*/
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for (i = 0 ; i < NUM_COUNTERS ; ++i) {
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if (!reset_value[i])
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continue;
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@ -343,13 +342,15 @@ static void op_amd_stop(struct op_msrs const * const msrs)
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#ifdef CONFIG_OPROFILE_IBS
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if (ibs_allowed && ibs_config.fetch_enabled) {
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low = 0; /* clear max count and enable */
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/* clear max count and enable */
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low = 0;
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high = 0;
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wrmsr(MSR_AMD64_IBSFETCHCTL, low, high);
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}
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if (ibs_allowed && ibs_config.op_enabled) {
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low = 0; /* clear max count and enable */
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/* clear max count and enable */
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low = 0;
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high = 0;
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wrmsr(MSR_AMD64_IBSOPCTL, low, high);
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}
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@ -370,18 +371,7 @@ static void op_amd_shutdown(struct op_msrs const * const msrs)
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}
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}
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#ifndef CONFIG_OPROFILE_IBS
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/* no IBS support */
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static int op_amd_init(struct oprofile_operations *ops)
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{
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return 0;
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}
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static void op_amd_exit(void) {}
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#else
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#ifdef CONFIG_OPROFILE_IBS
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static u8 ibs_eilvt_off;
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@ -395,7 +385,7 @@ static inline void apic_clear_ibs_nmi_per_cpu(void *arg)
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setup_APIC_eilvt_ibs(0, APIC_EILVT_MSG_FIX, 1);
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}
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static int pfm_amd64_setup_eilvt(void)
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static int init_ibs_nmi(void)
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{
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#define IBSCTL_LVTOFFSETVAL (1 << 8)
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#define IBSCTL 0x1cc
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@ -443,18 +433,22 @@ static int pfm_amd64_setup_eilvt(void)
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return 0;
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}
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/*
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* initialize the APIC for the IBS interrupts
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* if available (AMD Family10h rev B0 and later)
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*/
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static void setup_ibs(void)
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/* uninitialize the APIC for the IBS interrupts if needed */
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static void clear_ibs_nmi(void)
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{
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if (ibs_allowed)
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on_each_cpu(apic_clear_ibs_nmi_per_cpu, NULL, 1);
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}
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/* initialize the APIC for the IBS interrupts if available */
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static void ibs_init(void)
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{
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ibs_allowed = boot_cpu_has(X86_FEATURE_IBS);
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if (!ibs_allowed)
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return;
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if (pfm_amd64_setup_eilvt()) {
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if (init_ibs_nmi()) {
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ibs_allowed = 0;
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return;
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}
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@ -462,14 +456,12 @@ static void setup_ibs(void)
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printk(KERN_INFO "oprofile: AMD IBS detected\n");
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}
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/*
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* unitialize the APIC for the IBS interrupts if needed on AMD Family10h
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* rev B0 and later */
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static void clear_ibs_nmi(void)
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static void ibs_exit(void)
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{
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if (ibs_allowed)
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on_each_cpu(apic_clear_ibs_nmi_per_cpu, NULL, 1);
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if (!ibs_allowed)
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return;
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clear_ibs_nmi();
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}
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static int (*create_arch_files)(struct super_block *sb, struct dentry *root);
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@ -519,7 +511,7 @@ static int setup_ibs_files(struct super_block *sb, struct dentry *root)
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static int op_amd_init(struct oprofile_operations *ops)
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{
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setup_ibs();
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ibs_init();
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create_arch_files = ops->create_files;
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ops->create_files = setup_ibs_files;
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return 0;
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@ -527,10 +519,21 @@ static int op_amd_init(struct oprofile_operations *ops)
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static void op_amd_exit(void)
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{
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clear_ibs_nmi();
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ibs_exit();
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}
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#endif
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#else
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/* no IBS support */
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static int op_amd_init(struct oprofile_operations *ops)
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{
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return 0;
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}
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static void op_amd_exit(void) {}
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#endif /* CONFIG_OPROFILE_IBS */
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struct op_x86_model_spec const op_amd_spec = {
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.init = op_amd_init,
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@ -268,18 +268,6 @@ lookup_dcookie(struct mm_struct *mm, unsigned long addr, off_t *offset)
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return cookie;
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}
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static void increment_tail(struct oprofile_cpu_buffer *b)
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{
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unsigned long new_tail = b->tail_pos + 1;
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rmb(); /* be sure fifo pointers are synchromized */
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if (new_tail < b->buffer_size)
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b->tail_pos = new_tail;
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else
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b->tail_pos = 0;
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}
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static unsigned long last_cookie = INVALID_COOKIE;
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static void add_cpu_switch(int i)
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@ -331,28 +319,25 @@ static void add_trace_begin(void)
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#define IBS_FETCH_CODE_SIZE 2
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#define IBS_OP_CODE_SIZE 5
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#define IBS_EIP(offset) \
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(((struct op_sample *)&cpu_buf->buffer[(offset)])->eip)
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#define IBS_EVENT(offset) \
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(((struct op_sample *)&cpu_buf->buffer[(offset)])->event)
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/*
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* Add IBS fetch and op entries to event buffer
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*/
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static void add_ibs_begin(struct oprofile_cpu_buffer *cpu_buf, int code,
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struct mm_struct *mm)
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static void add_ibs_begin(int cpu, int code, struct mm_struct *mm)
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{
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unsigned long rip;
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int i, count;
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unsigned long ibs_cookie = 0;
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off_t offset;
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struct op_sample *sample;
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increment_tail(cpu_buf); /* move to RIP entry */
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rip = IBS_EIP(cpu_buf->tail_pos);
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sample = cpu_buffer_read_entry(cpu);
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if (!sample)
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goto Error;
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rip = sample->eip;
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#ifdef __LP64__
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rip += IBS_EVENT(cpu_buf->tail_pos) << 32;
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rip += sample->event << 32;
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#endif
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if (mm) {
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@ -376,8 +361,8 @@ static void add_ibs_begin(struct oprofile_cpu_buffer *cpu_buf, int code,
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add_event_entry(offset); /* Offset from Dcookie */
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/* we send the Dcookie offset, but send the raw Linear Add also*/
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add_event_entry(IBS_EIP(cpu_buf->tail_pos));
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add_event_entry(IBS_EVENT(cpu_buf->tail_pos));
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add_event_entry(sample->eip);
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add_event_entry(sample->event);
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if (code == IBS_FETCH_CODE)
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count = IBS_FETCH_CODE_SIZE; /*IBS FETCH is 2 int64s*/
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@ -385,10 +370,17 @@ static void add_ibs_begin(struct oprofile_cpu_buffer *cpu_buf, int code,
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count = IBS_OP_CODE_SIZE; /*IBS OP is 5 int64s*/
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for (i = 0; i < count; i++) {
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increment_tail(cpu_buf);
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add_event_entry(IBS_EIP(cpu_buf->tail_pos));
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add_event_entry(IBS_EVENT(cpu_buf->tail_pos));
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sample = cpu_buffer_read_entry(cpu);
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if (!sample)
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goto Error;
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add_event_entry(sample->eip);
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add_event_entry(sample->event);
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}
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return;
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Error:
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return;
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}
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#endif
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@ -466,33 +458,6 @@ static inline int is_code(unsigned long val)
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}
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/* "acquire" as many cpu buffer slots as we can */
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static unsigned long get_slots(struct oprofile_cpu_buffer *b)
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{
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unsigned long head = b->head_pos;
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unsigned long tail = b->tail_pos;
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/*
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* Subtle. This resets the persistent last_task
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* and in_kernel values used for switching notes.
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* BUT, there is a small window between reading
|
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* head_pos, and this call, that means samples
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* can appear at the new head position, but not
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* be prefixed with the notes for switching
|
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* kernel mode or a task switch. This small hole
|
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* can lead to mis-attribution or samples where
|
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* we don't know if it's in the kernel or not,
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* at the start of an event buffer.
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*/
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cpu_buffer_reset(b);
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|
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if (head >= tail)
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return head - tail;
|
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|
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return head + (b->buffer_size - tail);
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}
|
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|
||||
|
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/* Move tasks along towards death. Any tasks on dead_tasks
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* will definitely have no remaining references in any
|
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* CPU buffers at this point, because we use two lists,
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||||
|
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@ -559,61 +524,61 @@ typedef enum {
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|||
*/
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||||
void sync_buffer(int cpu)
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{
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struct oprofile_cpu_buffer *cpu_buf = &per_cpu(cpu_buffer, cpu);
|
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struct mm_struct *mm = NULL;
|
||||
struct mm_struct *oldmm;
|
||||
struct task_struct *new;
|
||||
unsigned long cookie = 0;
|
||||
int in_kernel = 1;
|
||||
sync_buffer_state state = sb_buffer_start;
|
||||
#ifndef CONFIG_OPROFILE_IBS
|
||||
unsigned int i;
|
||||
unsigned long available;
|
||||
#endif
|
||||
|
||||
mutex_lock(&buffer_mutex);
|
||||
|
||||
add_cpu_switch(cpu);
|
||||
|
||||
/* Remember, only we can modify tail_pos */
|
||||
|
||||
#ifndef CONFIG_OPROFILE_IBS
|
||||
available = get_slots(cpu_buf);
|
||||
cpu_buffer_reset(cpu);
|
||||
available = cpu_buffer_entries(cpu);
|
||||
|
||||
for (i = 0; i < available; ++i) {
|
||||
#else
|
||||
while (get_slots(cpu_buf)) {
|
||||
#endif
|
||||
struct op_sample *s = &cpu_buf->buffer[cpu_buf->tail_pos];
|
||||
struct op_sample *s = cpu_buffer_read_entry(cpu);
|
||||
if (!s)
|
||||
break;
|
||||
|
||||
if (is_code(s->eip)) {
|
||||
if (s->event <= CPU_IS_KERNEL) {
|
||||
switch (s->event) {
|
||||
case 0:
|
||||
case CPU_IS_KERNEL:
|
||||
/* kernel/userspace switch */
|
||||
in_kernel = s->event;
|
||||
if (state == sb_buffer_start)
|
||||
state = sb_sample_start;
|
||||
add_kernel_ctx_switch(s->event);
|
||||
} else if (s->event == CPU_TRACE_BEGIN) {
|
||||
break;
|
||||
case CPU_TRACE_BEGIN:
|
||||
state = sb_bt_start;
|
||||
add_trace_begin();
|
||||
break;
|
||||
#ifdef CONFIG_OPROFILE_IBS
|
||||
} else if (s->event == IBS_FETCH_BEGIN) {
|
||||
case IBS_FETCH_BEGIN:
|
||||
state = sb_bt_start;
|
||||
add_ibs_begin(cpu_buf, IBS_FETCH_CODE, mm);
|
||||
} else if (s->event == IBS_OP_BEGIN) {
|
||||
add_ibs_begin(cpu, IBS_FETCH_CODE, mm);
|
||||
break;
|
||||
case IBS_OP_BEGIN:
|
||||
state = sb_bt_start;
|
||||
add_ibs_begin(cpu_buf, IBS_OP_CODE, mm);
|
||||
add_ibs_begin(cpu, IBS_OP_CODE, mm);
|
||||
break;
|
||||
#endif
|
||||
} else {
|
||||
struct mm_struct *oldmm = mm;
|
||||
|
||||
default:
|
||||
/* userspace context switch */
|
||||
oldmm = mm;
|
||||
new = (struct task_struct *)s->event;
|
||||
|
||||
release_mm(oldmm);
|
||||
mm = take_tasks_mm(new);
|
||||
if (mm != oldmm)
|
||||
cookie = get_exec_dcookie(mm);
|
||||
add_user_ctx_switch(new, cookie);
|
||||
break;
|
||||
}
|
||||
} else if (state >= sb_bt_start &&
|
||||
!add_sample(mm, s, in_kernel)) {
|
||||
|
|
@ -622,8 +587,6 @@ void sync_buffer(int cpu)
|
|||
atomic_inc(&oprofile_stats.bt_lost_no_mapping);
|
||||
}
|
||||
}
|
||||
|
||||
increment_tail(cpu_buf);
|
||||
}
|
||||
release_mm(mm);
|
||||
|
||||
|
|
|
|||
|
|
@ -28,6 +28,25 @@
|
|||
#include "buffer_sync.h"
|
||||
#include "oprof.h"
|
||||
|
||||
#define OP_BUFFER_FLAGS 0
|
||||
|
||||
/*
|
||||
* Read and write access is using spin locking. Thus, writing to the
|
||||
* buffer by NMI handler (x86) could occur also during critical
|
||||
* sections when reading the buffer. To avoid this, there are 2
|
||||
* buffers for independent read and write access. Read access is in
|
||||
* process context only, write access only in the NMI handler. If the
|
||||
* read buffer runs empty, both buffers are swapped atomically. There
|
||||
* is potentially a small window during swapping where the buffers are
|
||||
* disabled and samples could be lost.
|
||||
*
|
||||
* Using 2 buffers is a little bit overhead, but the solution is clear
|
||||
* and does not require changes in the ring buffer implementation. It
|
||||
* can be changed to a single buffer solution when the ring buffer
|
||||
* access is implemented as non-locking atomic code.
|
||||
*/
|
||||
struct ring_buffer *op_ring_buffer_read;
|
||||
struct ring_buffer *op_ring_buffer_write;
|
||||
DEFINE_PER_CPU(struct oprofile_cpu_buffer, cpu_buffer);
|
||||
|
||||
static void wq_sync_buffer(struct work_struct *work);
|
||||
|
|
@ -37,12 +56,12 @@ static int work_enabled;
|
|||
|
||||
void free_cpu_buffers(void)
|
||||
{
|
||||
int i;
|
||||
|
||||
for_each_possible_cpu(i) {
|
||||
vfree(per_cpu(cpu_buffer, i).buffer);
|
||||
per_cpu(cpu_buffer, i).buffer = NULL;
|
||||
}
|
||||
if (op_ring_buffer_read)
|
||||
ring_buffer_free(op_ring_buffer_read);
|
||||
op_ring_buffer_read = NULL;
|
||||
if (op_ring_buffer_write)
|
||||
ring_buffer_free(op_ring_buffer_write);
|
||||
op_ring_buffer_write = NULL;
|
||||
}
|
||||
|
||||
unsigned long oprofile_get_cpu_buffer_size(void)
|
||||
|
|
@ -64,14 +83,16 @@ int alloc_cpu_buffers(void)
|
|||
|
||||
unsigned long buffer_size = fs_cpu_buffer_size;
|
||||
|
||||
op_ring_buffer_read = ring_buffer_alloc(buffer_size, OP_BUFFER_FLAGS);
|
||||
if (!op_ring_buffer_read)
|
||||
goto fail;
|
||||
op_ring_buffer_write = ring_buffer_alloc(buffer_size, OP_BUFFER_FLAGS);
|
||||
if (!op_ring_buffer_write)
|
||||
goto fail;
|
||||
|
||||
for_each_possible_cpu(i) {
|
||||
struct oprofile_cpu_buffer *b = &per_cpu(cpu_buffer, i);
|
||||
|
||||
b->buffer = vmalloc_node(sizeof(struct op_sample) * buffer_size,
|
||||
cpu_to_node(i));
|
||||
if (!b->buffer)
|
||||
goto fail;
|
||||
|
||||
b->last_task = NULL;
|
||||
b->last_is_kernel = -1;
|
||||
b->tracing = 0;
|
||||
|
|
@ -124,57 +145,31 @@ void end_cpu_work(void)
|
|||
flush_scheduled_work();
|
||||
}
|
||||
|
||||
/* Resets the cpu buffer to a sane state. */
|
||||
void cpu_buffer_reset(struct oprofile_cpu_buffer *cpu_buf)
|
||||
{
|
||||
/* reset these to invalid values; the next sample
|
||||
* collected will populate the buffer with proper
|
||||
* values to initialize the buffer
|
||||
*/
|
||||
cpu_buf->last_is_kernel = -1;
|
||||
cpu_buf->last_task = NULL;
|
||||
}
|
||||
|
||||
/* compute number of available slots in cpu_buffer queue */
|
||||
static unsigned long nr_available_slots(struct oprofile_cpu_buffer const *b)
|
||||
{
|
||||
unsigned long head = b->head_pos;
|
||||
unsigned long tail = b->tail_pos;
|
||||
|
||||
if (tail > head)
|
||||
return (tail - head) - 1;
|
||||
|
||||
return tail + (b->buffer_size - head) - 1;
|
||||
}
|
||||
|
||||
static void increment_head(struct oprofile_cpu_buffer *b)
|
||||
{
|
||||
unsigned long new_head = b->head_pos + 1;
|
||||
|
||||
/* Ensure anything written to the slot before we
|
||||
* increment is visible */
|
||||
wmb();
|
||||
|
||||
if (new_head < b->buffer_size)
|
||||
b->head_pos = new_head;
|
||||
else
|
||||
b->head_pos = 0;
|
||||
}
|
||||
|
||||
static inline void
|
||||
static inline int
|
||||
add_sample(struct oprofile_cpu_buffer *cpu_buf,
|
||||
unsigned long pc, unsigned long event)
|
||||
{
|
||||
struct op_sample *entry = &cpu_buf->buffer[cpu_buf->head_pos];
|
||||
entry->eip = pc;
|
||||
entry->event = event;
|
||||
increment_head(cpu_buf);
|
||||
struct op_entry entry;
|
||||
int ret;
|
||||
|
||||
ret = cpu_buffer_write_entry(&entry);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
entry.sample->eip = pc;
|
||||
entry.sample->event = event;
|
||||
|
||||
ret = cpu_buffer_write_commit(&entry);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline void
|
||||
static inline int
|
||||
add_code(struct oprofile_cpu_buffer *buffer, unsigned long value)
|
||||
{
|
||||
add_sample(buffer, ESCAPE_CODE, value);
|
||||
return add_sample(buffer, ESCAPE_CODE, value);
|
||||
}
|
||||
|
||||
/* This must be safe from any context. It's safe writing here
|
||||
|
|
@ -198,11 +193,6 @@ static int log_sample(struct oprofile_cpu_buffer *cpu_buf, unsigned long pc,
|
|||
return 0;
|
||||
}
|
||||
|
||||
if (nr_available_slots(cpu_buf) < 3) {
|
||||
cpu_buf->sample_lost_overflow++;
|
||||
return 0;
|
||||
}
|
||||
|
||||
is_kernel = !!is_kernel;
|
||||
|
||||
task = current;
|
||||
|
|
@ -210,26 +200,29 @@ static int log_sample(struct oprofile_cpu_buffer *cpu_buf, unsigned long pc,
|
|||
/* notice a switch from user->kernel or vice versa */
|
||||
if (cpu_buf->last_is_kernel != is_kernel) {
|
||||
cpu_buf->last_is_kernel = is_kernel;
|
||||
add_code(cpu_buf, is_kernel);
|
||||
if (add_code(cpu_buf, is_kernel))
|
||||
goto fail;
|
||||
}
|
||||
|
||||
/* notice a task switch */
|
||||
if (cpu_buf->last_task != task) {
|
||||
cpu_buf->last_task = task;
|
||||
add_code(cpu_buf, (unsigned long)task);
|
||||
if (add_code(cpu_buf, (unsigned long)task))
|
||||
goto fail;
|
||||
}
|
||||
|
||||
add_sample(cpu_buf, pc, event);
|
||||
if (add_sample(cpu_buf, pc, event))
|
||||
goto fail;
|
||||
|
||||
return 1;
|
||||
|
||||
fail:
|
||||
cpu_buf->sample_lost_overflow++;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int oprofile_begin_trace(struct oprofile_cpu_buffer *cpu_buf)
|
||||
{
|
||||
if (nr_available_slots(cpu_buf) < 4) {
|
||||
cpu_buf->sample_lost_overflow++;
|
||||
return 0;
|
||||
}
|
||||
|
||||
add_code(cpu_buf, CPU_TRACE_BEGIN);
|
||||
cpu_buf->tracing = 1;
|
||||
return 1;
|
||||
|
|
@ -253,8 +246,10 @@ void oprofile_add_ext_sample(unsigned long pc, struct pt_regs * const regs,
|
|||
if (!oprofile_begin_trace(cpu_buf))
|
||||
return;
|
||||
|
||||
/* if log_sample() fail we can't backtrace since we lost the source
|
||||
* of this event */
|
||||
/*
|
||||
* if log_sample() fail we can't backtrace since we lost the
|
||||
* source of this event
|
||||
*/
|
||||
if (log_sample(cpu_buf, pc, is_kernel, event))
|
||||
oprofile_ops.backtrace(regs, backtrace_depth);
|
||||
oprofile_end_trace(cpu_buf);
|
||||
|
|
@ -272,49 +267,55 @@ void oprofile_add_sample(struct pt_regs * const regs, unsigned long event)
|
|||
|
||||
#define MAX_IBS_SAMPLE_SIZE 14
|
||||
|
||||
void oprofile_add_ibs_sample(struct pt_regs *const regs,
|
||||
unsigned int *const ibs_sample, int ibs_code)
|
||||
void oprofile_add_ibs_sample(struct pt_regs * const regs,
|
||||
unsigned int * const ibs_sample, int ibs_code)
|
||||
{
|
||||
int is_kernel = !user_mode(regs);
|
||||
struct oprofile_cpu_buffer *cpu_buf = &__get_cpu_var(cpu_buffer);
|
||||
struct task_struct *task;
|
||||
int fail = 0;
|
||||
|
||||
cpu_buf->sample_received++;
|
||||
|
||||
if (nr_available_slots(cpu_buf) < MAX_IBS_SAMPLE_SIZE) {
|
||||
/* we can't backtrace since we lost the source of this event */
|
||||
cpu_buf->sample_lost_overflow++;
|
||||
return;
|
||||
}
|
||||
|
||||
/* notice a switch from user->kernel or vice versa */
|
||||
if (cpu_buf->last_is_kernel != is_kernel) {
|
||||
if (add_code(cpu_buf, is_kernel))
|
||||
goto fail;
|
||||
cpu_buf->last_is_kernel = is_kernel;
|
||||
add_code(cpu_buf, is_kernel);
|
||||
}
|
||||
|
||||
/* notice a task switch */
|
||||
if (!is_kernel) {
|
||||
task = current;
|
||||
if (cpu_buf->last_task != task) {
|
||||
if (add_code(cpu_buf, (unsigned long)task))
|
||||
goto fail;
|
||||
cpu_buf->last_task = task;
|
||||
add_code(cpu_buf, (unsigned long)task);
|
||||
}
|
||||
}
|
||||
|
||||
add_code(cpu_buf, ibs_code);
|
||||
add_sample(cpu_buf, ibs_sample[0], ibs_sample[1]);
|
||||
add_sample(cpu_buf, ibs_sample[2], ibs_sample[3]);
|
||||
add_sample(cpu_buf, ibs_sample[4], ibs_sample[5]);
|
||||
fail = fail || add_code(cpu_buf, ibs_code);
|
||||
fail = fail || add_sample(cpu_buf, ibs_sample[0], ibs_sample[1]);
|
||||
fail = fail || add_sample(cpu_buf, ibs_sample[2], ibs_sample[3]);
|
||||
fail = fail || add_sample(cpu_buf, ibs_sample[4], ibs_sample[5]);
|
||||
|
||||
if (ibs_code == IBS_OP_BEGIN) {
|
||||
add_sample(cpu_buf, ibs_sample[6], ibs_sample[7]);
|
||||
add_sample(cpu_buf, ibs_sample[8], ibs_sample[9]);
|
||||
add_sample(cpu_buf, ibs_sample[10], ibs_sample[11]);
|
||||
fail = fail || add_sample(cpu_buf, ibs_sample[6], ibs_sample[7]);
|
||||
fail = fail || add_sample(cpu_buf, ibs_sample[8], ibs_sample[9]);
|
||||
fail = fail || add_sample(cpu_buf, ibs_sample[10], ibs_sample[11]);
|
||||
}
|
||||
|
||||
if (fail)
|
||||
goto fail;
|
||||
|
||||
if (backtrace_depth)
|
||||
oprofile_ops.backtrace(regs, backtrace_depth);
|
||||
|
||||
return;
|
||||
|
||||
fail:
|
||||
cpu_buf->sample_lost_overflow++;
|
||||
return;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
|
@ -332,21 +333,21 @@ void oprofile_add_trace(unsigned long pc)
|
|||
if (!cpu_buf->tracing)
|
||||
return;
|
||||
|
||||
if (nr_available_slots(cpu_buf) < 1) {
|
||||
cpu_buf->tracing = 0;
|
||||
cpu_buf->sample_lost_overflow++;
|
||||
return;
|
||||
}
|
||||
/*
|
||||
* broken frame can give an eip with the same value as an
|
||||
* escape code, abort the trace if we get it
|
||||
*/
|
||||
if (pc == ESCAPE_CODE)
|
||||
goto fail;
|
||||
|
||||
/* broken frame can give an eip with the same value as an escape code,
|
||||
* abort the trace if we get it */
|
||||
if (pc == ESCAPE_CODE) {
|
||||
cpu_buf->tracing = 0;
|
||||
cpu_buf->backtrace_aborted++;
|
||||
return;
|
||||
}
|
||||
if (add_sample(cpu_buf, pc, 0))
|
||||
goto fail;
|
||||
|
||||
add_sample(cpu_buf, pc, 0);
|
||||
return;
|
||||
fail:
|
||||
cpu_buf->tracing = 0;
|
||||
cpu_buf->backtrace_aborted++;
|
||||
return;
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
|
|||
|
|
@ -15,6 +15,7 @@
|
|||
#include <linux/workqueue.h>
|
||||
#include <linux/cache.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/ring_buffer.h>
|
||||
|
||||
struct task_struct;
|
||||
|
||||
|
|
@ -32,6 +33,12 @@ struct op_sample {
|
|||
unsigned long event;
|
||||
};
|
||||
|
||||
struct op_entry {
|
||||
struct ring_buffer_event *event;
|
||||
struct op_sample *sample;
|
||||
unsigned long irq_flags;
|
||||
};
|
||||
|
||||
struct oprofile_cpu_buffer {
|
||||
volatile unsigned long head_pos;
|
||||
volatile unsigned long tail_pos;
|
||||
|
|
@ -39,7 +46,6 @@ struct oprofile_cpu_buffer {
|
|||
struct task_struct *last_task;
|
||||
int last_is_kernel;
|
||||
int tracing;
|
||||
struct op_sample *buffer;
|
||||
unsigned long sample_received;
|
||||
unsigned long sample_lost_overflow;
|
||||
unsigned long backtrace_aborted;
|
||||
|
|
@ -48,9 +54,68 @@ struct oprofile_cpu_buffer {
|
|||
struct delayed_work work;
|
||||
};
|
||||
|
||||
extern struct ring_buffer *op_ring_buffer_read;
|
||||
extern struct ring_buffer *op_ring_buffer_write;
|
||||
DECLARE_PER_CPU(struct oprofile_cpu_buffer, cpu_buffer);
|
||||
|
||||
void cpu_buffer_reset(struct oprofile_cpu_buffer *cpu_buf);
|
||||
/*
|
||||
* Resets the cpu buffer to a sane state.
|
||||
*
|
||||
* reset these to invalid values; the next sample collected will
|
||||
* populate the buffer with proper values to initialize the buffer
|
||||
*/
|
||||
static inline void cpu_buffer_reset(int cpu)
|
||||
{
|
||||
struct oprofile_cpu_buffer *cpu_buf = &per_cpu(cpu_buffer, cpu);
|
||||
|
||||
cpu_buf->last_is_kernel = -1;
|
||||
cpu_buf->last_task = NULL;
|
||||
}
|
||||
|
||||
static inline int cpu_buffer_write_entry(struct op_entry *entry)
|
||||
{
|
||||
entry->event = ring_buffer_lock_reserve(op_ring_buffer_write,
|
||||
sizeof(struct op_sample),
|
||||
&entry->irq_flags);
|
||||
if (entry->event)
|
||||
entry->sample = ring_buffer_event_data(entry->event);
|
||||
else
|
||||
entry->sample = NULL;
|
||||
|
||||
if (!entry->sample)
|
||||
return -ENOMEM;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline int cpu_buffer_write_commit(struct op_entry *entry)
|
||||
{
|
||||
return ring_buffer_unlock_commit(op_ring_buffer_write, entry->event,
|
||||
entry->irq_flags);
|
||||
}
|
||||
|
||||
static inline struct op_sample *cpu_buffer_read_entry(int cpu)
|
||||
{
|
||||
struct ring_buffer_event *e;
|
||||
e = ring_buffer_consume(op_ring_buffer_read, cpu, NULL);
|
||||
if (e)
|
||||
return ring_buffer_event_data(e);
|
||||
if (ring_buffer_swap_cpu(op_ring_buffer_read,
|
||||
op_ring_buffer_write,
|
||||
cpu))
|
||||
return NULL;
|
||||
e = ring_buffer_consume(op_ring_buffer_read, cpu, NULL);
|
||||
if (e)
|
||||
return ring_buffer_event_data(e);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* "acquire" as many cpu buffer slots as we can */
|
||||
static inline unsigned long cpu_buffer_entries(int cpu)
|
||||
{
|
||||
return ring_buffer_entries_cpu(op_ring_buffer_read, cpu)
|
||||
+ ring_buffer_entries_cpu(op_ring_buffer_write, cpu);
|
||||
}
|
||||
|
||||
/* transient events for the CPU buffer -> event buffer */
|
||||
#define CPU_IS_KERNEL 1
|
||||
|
|
|
|||
|
|
@ -14,9 +14,13 @@
|
|||
#include "oprofile_stats.h"
|
||||
#include "oprof.h"
|
||||
|
||||
unsigned long fs_buffer_size = 131072;
|
||||
unsigned long fs_cpu_buffer_size = 8192;
|
||||
unsigned long fs_buffer_watershed = 32768; /* FIXME: tune */
|
||||
#define FS_BUFFER_SIZE_DEFAULT 131072
|
||||
#define FS_CPU_BUFFER_SIZE_DEFAULT 8192
|
||||
#define FS_BUFFER_WATERSHED_DEFAULT 32768 /* FIXME: tune */
|
||||
|
||||
unsigned long fs_buffer_size;
|
||||
unsigned long fs_cpu_buffer_size;
|
||||
unsigned long fs_buffer_watershed;
|
||||
|
||||
static ssize_t depth_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
|
||||
{
|
||||
|
|
@ -120,6 +124,11 @@ static const struct file_operations dump_fops = {
|
|||
|
||||
void oprofile_create_files(struct super_block *sb, struct dentry *root)
|
||||
{
|
||||
/* reinitialize default values */
|
||||
fs_buffer_size = FS_BUFFER_SIZE_DEFAULT;
|
||||
fs_cpu_buffer_size = FS_CPU_BUFFER_SIZE_DEFAULT;
|
||||
fs_buffer_watershed = FS_BUFFER_WATERSHED_DEFAULT;
|
||||
|
||||
oprofilefs_create_file(sb, root, "enable", &enable_fops);
|
||||
oprofilefs_create_file_perm(sb, root, "dump", &dump_fops, 0666);
|
||||
oprofilefs_create_file(sb, root, "buffer", &event_buffer_fops);
|
||||
|
|
|
|||
|
|
@ -86,8 +86,7 @@ int oprofile_arch_init(struct oprofile_operations * ops);
|
|||
void oprofile_arch_exit(void);
|
||||
|
||||
/**
|
||||
* Add a sample. This may be called from any context. Pass
|
||||
* smp_processor_id() as cpu.
|
||||
* Add a sample. This may be called from any context.
|
||||
*/
|
||||
void oprofile_add_sample(struct pt_regs * const regs, unsigned long event);
|
||||
|
||||
|
|
|
|||
|
|
@ -118,6 +118,8 @@ void ring_buffer_record_enable_cpu(struct ring_buffer *buffer, int cpu);
|
|||
|
||||
unsigned long ring_buffer_entries(struct ring_buffer *buffer);
|
||||
unsigned long ring_buffer_overruns(struct ring_buffer *buffer);
|
||||
unsigned long ring_buffer_entries_cpu(struct ring_buffer *buffer, int cpu);
|
||||
unsigned long ring_buffer_overrun_cpu(struct ring_buffer *buffer, int cpu);
|
||||
|
||||
u64 ring_buffer_time_stamp(int cpu);
|
||||
void ring_buffer_normalize_time_stamp(int cpu, u64 *ts);
|
||||
|
|
|
|||
|
|
@ -69,6 +69,7 @@ void tracing_on(void)
|
|||
{
|
||||
set_bit(RB_BUFFERS_ON_BIT, &ring_buffer_flags);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(tracing_on);
|
||||
|
||||
/**
|
||||
* tracing_off - turn off all tracing buffers
|
||||
|
|
@ -82,6 +83,7 @@ void tracing_off(void)
|
|||
{
|
||||
clear_bit(RB_BUFFERS_ON_BIT, &ring_buffer_flags);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(tracing_off);
|
||||
|
||||
/**
|
||||
* tracing_off_permanent - permanently disable ring buffers
|
||||
|
|
@ -111,12 +113,14 @@ u64 ring_buffer_time_stamp(int cpu)
|
|||
|
||||
return time;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_time_stamp);
|
||||
|
||||
void ring_buffer_normalize_time_stamp(int cpu, u64 *ts)
|
||||
{
|
||||
/* Just stupid testing the normalize function and deltas */
|
||||
*ts >>= DEBUG_SHIFT;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_normalize_time_stamp);
|
||||
|
||||
#define RB_EVNT_HDR_SIZE (sizeof(struct ring_buffer_event))
|
||||
#define RB_ALIGNMENT_SHIFT 2
|
||||
|
|
@ -166,6 +170,7 @@ unsigned ring_buffer_event_length(struct ring_buffer_event *event)
|
|||
{
|
||||
return rb_event_length(event);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_event_length);
|
||||
|
||||
/* inline for ring buffer fast paths */
|
||||
static inline void *
|
||||
|
|
@ -187,6 +192,7 @@ void *ring_buffer_event_data(struct ring_buffer_event *event)
|
|||
{
|
||||
return rb_event_data(event);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_event_data);
|
||||
|
||||
#define for_each_buffer_cpu(buffer, cpu) \
|
||||
for_each_cpu_mask(cpu, buffer->cpumask)
|
||||
|
|
@ -427,7 +433,7 @@ extern int ring_buffer_page_too_big(void);
|
|||
|
||||
/**
|
||||
* ring_buffer_alloc - allocate a new ring_buffer
|
||||
* @size: the size in bytes that is needed.
|
||||
* @size: the size in bytes per cpu that is needed.
|
||||
* @flags: attributes to set for the ring buffer.
|
||||
*
|
||||
* Currently the only flag that is available is the RB_FL_OVERWRITE
|
||||
|
|
@ -490,6 +496,7 @@ struct ring_buffer *ring_buffer_alloc(unsigned long size, unsigned flags)
|
|||
kfree(buffer);
|
||||
return NULL;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_alloc);
|
||||
|
||||
/**
|
||||
* ring_buffer_free - free a ring buffer.
|
||||
|
|
@ -505,6 +512,7 @@ ring_buffer_free(struct ring_buffer *buffer)
|
|||
|
||||
kfree(buffer);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_free);
|
||||
|
||||
static void rb_reset_cpu(struct ring_buffer_per_cpu *cpu_buffer);
|
||||
|
||||
|
|
@ -680,6 +688,7 @@ int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size)
|
|||
mutex_unlock(&buffer->mutex);
|
||||
return -ENOMEM;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_resize);
|
||||
|
||||
static inline int rb_null_event(struct ring_buffer_event *event)
|
||||
{
|
||||
|
|
@ -1304,6 +1313,7 @@ ring_buffer_lock_reserve(struct ring_buffer *buffer,
|
|||
ftrace_preempt_enable(resched);
|
||||
return NULL;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_lock_reserve);
|
||||
|
||||
static void rb_commit(struct ring_buffer_per_cpu *cpu_buffer,
|
||||
struct ring_buffer_event *event)
|
||||
|
|
@ -1350,6 +1360,7 @@ int ring_buffer_unlock_commit(struct ring_buffer *buffer,
|
|||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_unlock_commit);
|
||||
|
||||
/**
|
||||
* ring_buffer_write - write data to the buffer without reserving
|
||||
|
|
@ -1411,6 +1422,7 @@ int ring_buffer_write(struct ring_buffer *buffer,
|
|||
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_write);
|
||||
|
||||
static inline int rb_per_cpu_empty(struct ring_buffer_per_cpu *cpu_buffer)
|
||||
{
|
||||
|
|
@ -1437,6 +1449,7 @@ void ring_buffer_record_disable(struct ring_buffer *buffer)
|
|||
{
|
||||
atomic_inc(&buffer->record_disabled);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_record_disable);
|
||||
|
||||
/**
|
||||
* ring_buffer_record_enable - enable writes to the buffer
|
||||
|
|
@ -1449,6 +1462,7 @@ void ring_buffer_record_enable(struct ring_buffer *buffer)
|
|||
{
|
||||
atomic_dec(&buffer->record_disabled);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_record_enable);
|
||||
|
||||
/**
|
||||
* ring_buffer_record_disable_cpu - stop all writes into the cpu_buffer
|
||||
|
|
@ -1470,6 +1484,7 @@ void ring_buffer_record_disable_cpu(struct ring_buffer *buffer, int cpu)
|
|||
cpu_buffer = buffer->buffers[cpu];
|
||||
atomic_inc(&cpu_buffer->record_disabled);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_record_disable_cpu);
|
||||
|
||||
/**
|
||||
* ring_buffer_record_enable_cpu - enable writes to the buffer
|
||||
|
|
@ -1489,6 +1504,7 @@ void ring_buffer_record_enable_cpu(struct ring_buffer *buffer, int cpu)
|
|||
cpu_buffer = buffer->buffers[cpu];
|
||||
atomic_dec(&cpu_buffer->record_disabled);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_record_enable_cpu);
|
||||
|
||||
/**
|
||||
* ring_buffer_entries_cpu - get the number of entries in a cpu buffer
|
||||
|
|
@ -1505,6 +1521,7 @@ unsigned long ring_buffer_entries_cpu(struct ring_buffer *buffer, int cpu)
|
|||
cpu_buffer = buffer->buffers[cpu];
|
||||
return cpu_buffer->entries;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_entries_cpu);
|
||||
|
||||
/**
|
||||
* ring_buffer_overrun_cpu - get the number of overruns in a cpu_buffer
|
||||
|
|
@ -1521,6 +1538,7 @@ unsigned long ring_buffer_overrun_cpu(struct ring_buffer *buffer, int cpu)
|
|||
cpu_buffer = buffer->buffers[cpu];
|
||||
return cpu_buffer->overrun;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_overrun_cpu);
|
||||
|
||||
/**
|
||||
* ring_buffer_entries - get the number of entries in a buffer
|
||||
|
|
@ -1543,6 +1561,7 @@ unsigned long ring_buffer_entries(struct ring_buffer *buffer)
|
|||
|
||||
return entries;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_entries);
|
||||
|
||||
/**
|
||||
* ring_buffer_overrun_cpu - get the number of overruns in buffer
|
||||
|
|
@ -1565,6 +1584,7 @@ unsigned long ring_buffer_overruns(struct ring_buffer *buffer)
|
|||
|
||||
return overruns;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_overruns);
|
||||
|
||||
static void rb_iter_reset(struct ring_buffer_iter *iter)
|
||||
{
|
||||
|
|
@ -1600,6 +1620,7 @@ void ring_buffer_iter_reset(struct ring_buffer_iter *iter)
|
|||
rb_iter_reset(iter);
|
||||
spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_iter_reset);
|
||||
|
||||
/**
|
||||
* ring_buffer_iter_empty - check if an iterator has no more to read
|
||||
|
|
@ -1614,6 +1635,7 @@ int ring_buffer_iter_empty(struct ring_buffer_iter *iter)
|
|||
return iter->head_page == cpu_buffer->commit_page &&
|
||||
iter->head == rb_commit_index(cpu_buffer);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_iter_empty);
|
||||
|
||||
static void
|
||||
rb_update_read_stamp(struct ring_buffer_per_cpu *cpu_buffer,
|
||||
|
|
@ -1880,6 +1902,7 @@ rb_buffer_peek(struct ring_buffer *buffer, int cpu, u64 *ts)
|
|||
|
||||
return NULL;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_peek);
|
||||
|
||||
static struct ring_buffer_event *
|
||||
rb_iter_peek(struct ring_buffer_iter *iter, u64 *ts)
|
||||
|
|
@ -1940,6 +1963,7 @@ rb_iter_peek(struct ring_buffer_iter *iter, u64 *ts)
|
|||
|
||||
return NULL;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_iter_peek);
|
||||
|
||||
/**
|
||||
* ring_buffer_peek - peek at the next event to be read
|
||||
|
|
@ -2017,6 +2041,7 @@ ring_buffer_consume(struct ring_buffer *buffer, int cpu, u64 *ts)
|
|||
|
||||
return event;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_consume);
|
||||
|
||||
/**
|
||||
* ring_buffer_read_start - start a non consuming read of the buffer
|
||||
|
|
@ -2059,6 +2084,7 @@ ring_buffer_read_start(struct ring_buffer *buffer, int cpu)
|
|||
|
||||
return iter;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_read_start);
|
||||
|
||||
/**
|
||||
* ring_buffer_finish - finish reading the iterator of the buffer
|
||||
|
|
@ -2075,6 +2101,7 @@ ring_buffer_read_finish(struct ring_buffer_iter *iter)
|
|||
atomic_dec(&cpu_buffer->record_disabled);
|
||||
kfree(iter);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_read_finish);
|
||||
|
||||
/**
|
||||
* ring_buffer_read - read the next item in the ring buffer by the iterator
|
||||
|
|
@ -2101,6 +2128,7 @@ ring_buffer_read(struct ring_buffer_iter *iter, u64 *ts)
|
|||
|
||||
return event;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_read);
|
||||
|
||||
/**
|
||||
* ring_buffer_size - return the size of the ring buffer (in bytes)
|
||||
|
|
@ -2110,6 +2138,7 @@ unsigned long ring_buffer_size(struct ring_buffer *buffer)
|
|||
{
|
||||
return BUF_PAGE_SIZE * buffer->pages;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_size);
|
||||
|
||||
static void
|
||||
rb_reset_cpu(struct ring_buffer_per_cpu *cpu_buffer)
|
||||
|
|
@ -2156,6 +2185,7 @@ void ring_buffer_reset_cpu(struct ring_buffer *buffer, int cpu)
|
|||
|
||||
spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_reset_cpu);
|
||||
|
||||
/**
|
||||
* ring_buffer_reset - reset a ring buffer
|
||||
|
|
@ -2168,6 +2198,7 @@ void ring_buffer_reset(struct ring_buffer *buffer)
|
|||
for_each_buffer_cpu(buffer, cpu)
|
||||
ring_buffer_reset_cpu(buffer, cpu);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_reset);
|
||||
|
||||
/**
|
||||
* rind_buffer_empty - is the ring buffer empty?
|
||||
|
|
@ -2186,6 +2217,7 @@ int ring_buffer_empty(struct ring_buffer *buffer)
|
|||
}
|
||||
return 1;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_empty);
|
||||
|
||||
/**
|
||||
* ring_buffer_empty_cpu - is a cpu buffer of a ring buffer empty?
|
||||
|
|
@ -2202,6 +2234,7 @@ int ring_buffer_empty_cpu(struct ring_buffer *buffer, int cpu)
|
|||
cpu_buffer = buffer->buffers[cpu];
|
||||
return rb_per_cpu_empty(cpu_buffer);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_empty_cpu);
|
||||
|
||||
/**
|
||||
* ring_buffer_swap_cpu - swap a CPU buffer between two ring buffers
|
||||
|
|
@ -2250,6 +2283,7 @@ int ring_buffer_swap_cpu(struct ring_buffer *buffer_a,
|
|||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ring_buffer_swap_cpu);
|
||||
|
||||
static void rb_remove_entries(struct ring_buffer_per_cpu *cpu_buffer,
|
||||
struct buffer_data_page *bpage)
|
||||
|
|
|
|||
|
|
@ -1310,7 +1310,7 @@ enum trace_file_type {
|
|||
TRACE_FILE_ANNOTATE = 2,
|
||||
};
|
||||
|
||||
static void trace_iterator_increment(struct trace_iterator *iter, int cpu)
|
||||
static void trace_iterator_increment(struct trace_iterator *iter)
|
||||
{
|
||||
/* Don't allow ftrace to trace into the ring buffers */
|
||||
ftrace_disable_cpu();
|
||||
|
|
@ -1389,7 +1389,7 @@ static void *find_next_entry_inc(struct trace_iterator *iter)
|
|||
iter->ent = __find_next_entry(iter, &iter->cpu, &iter->ts);
|
||||
|
||||
if (iter->ent)
|
||||
trace_iterator_increment(iter, iter->cpu);
|
||||
trace_iterator_increment(iter);
|
||||
|
||||
return iter->ent ? iter : NULL;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue