x86, perf_counter, bts: Optimize BTS overflow handling
Draining the BTS buffer on a buffer overflow interrupt takes too long resulting in a kernel lockup when tracing the kernel. Restructure perf_counter sampling into sample creation and sample output. Prepare a single reference sample for BTS sampling and update the from and to address fields when draining the BTS buffer. Drain the entire BTS buffer between a single perf_output_begin() / perf_output_end() pair. Signed-off-by: Markus Metzger <markus.t.metzger@intel.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <20090915130023.A16204@sedona.ch.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Markus Metzger
Ingo Molnar
parent
4b77a72977
commit
5622f295b5
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@ -36,10 +36,10 @@ static u64 perf_counter_mask __read_mostly;
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#define BTS_RECORD_SIZE 24
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/* The size of a per-cpu BTS buffer in bytes: */
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#define BTS_BUFFER_SIZE (BTS_RECORD_SIZE * 1024)
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#define BTS_BUFFER_SIZE (BTS_RECORD_SIZE * 2048)
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/* The BTS overflow threshold in bytes from the end of the buffer: */
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#define BTS_OVFL_TH (BTS_RECORD_SIZE * 64)
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#define BTS_OVFL_TH (BTS_RECORD_SIZE * 128)
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/*
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@ -1488,8 +1488,7 @@ void perf_counter_print_debug(void)
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local_irq_restore(flags);
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}
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static void intel_pmu_drain_bts_buffer(struct cpu_hw_counters *cpuc,
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struct perf_sample_data *data)
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static void intel_pmu_drain_bts_buffer(struct cpu_hw_counters *cpuc)
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{
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struct debug_store *ds = cpuc->ds;
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struct bts_record {
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@ -1498,8 +1497,11 @@ static void intel_pmu_drain_bts_buffer(struct cpu_hw_counters *cpuc,
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u64 flags;
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};
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struct perf_counter *counter = cpuc->counters[X86_PMC_IDX_FIXED_BTS];
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unsigned long orig_ip = data->regs->ip;
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struct bts_record *at, *top;
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struct perf_output_handle handle;
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struct perf_event_header header;
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struct perf_sample_data data;
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struct pt_regs regs;
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if (!counter)
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return;
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@ -1510,19 +1512,38 @@ static void intel_pmu_drain_bts_buffer(struct cpu_hw_counters *cpuc,
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at = (struct bts_record *)(unsigned long)ds->bts_buffer_base;
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top = (struct bts_record *)(unsigned long)ds->bts_index;
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if (top <= at)
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return;
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ds->bts_index = ds->bts_buffer_base;
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for (; at < top; at++) {
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data->regs->ip = at->from;
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data->addr = at->to;
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perf_counter_output(counter, 1, data);
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data.period = counter->hw.last_period;
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data.addr = 0;
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regs.ip = 0;
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/*
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* Prepare a generic sample, i.e. fill in the invariant fields.
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* We will overwrite the from and to address before we output
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* the sample.
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*/
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perf_prepare_sample(&header, &data, counter, ®s);
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if (perf_output_begin(&handle, counter,
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header.size * (top - at), 1, 1))
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return;
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for (; at < top; at++) {
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data.ip = at->from;
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data.addr = at->to;
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perf_output_sample(&handle, &header, &data, counter);
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}
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data->regs->ip = orig_ip;
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data->addr = 0;
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perf_output_end(&handle);
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/* There's new data available. */
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counter->hw.interrupts++;
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counter->pending_kill = POLL_IN;
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}
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@ -1552,13 +1573,9 @@ static void x86_pmu_disable(struct perf_counter *counter)
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x86_perf_counter_update(counter, hwc, idx);
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/* Drain the remaining BTS records. */
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if (unlikely(idx == X86_PMC_IDX_FIXED_BTS)) {
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struct perf_sample_data data;
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struct pt_regs regs;
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if (unlikely(idx == X86_PMC_IDX_FIXED_BTS))
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intel_pmu_drain_bts_buffer(cpuc);
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data.regs = ®s;
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intel_pmu_drain_bts_buffer(cpuc, &data);
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}
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cpuc->counters[idx] = NULL;
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clear_bit(idx, cpuc->used_mask);
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@ -1619,7 +1636,6 @@ static int p6_pmu_handle_irq(struct pt_regs *regs)
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int idx, handled = 0;
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u64 val;
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data.regs = regs;
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data.addr = 0;
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cpuc = &__get_cpu_var(cpu_hw_counters);
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@ -1644,7 +1660,7 @@ static int p6_pmu_handle_irq(struct pt_regs *regs)
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if (!x86_perf_counter_set_period(counter, hwc, idx))
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continue;
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if (perf_counter_overflow(counter, 1, &data))
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if (perf_counter_overflow(counter, 1, &data, regs))
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p6_pmu_disable_counter(hwc, idx);
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}
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@ -1665,13 +1681,12 @@ static int intel_pmu_handle_irq(struct pt_regs *regs)
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int bit, loops;
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u64 ack, status;
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data.regs = regs;
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data.addr = 0;
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cpuc = &__get_cpu_var(cpu_hw_counters);
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perf_disable();
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intel_pmu_drain_bts_buffer(cpuc, &data);
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intel_pmu_drain_bts_buffer(cpuc);
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status = intel_pmu_get_status();
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if (!status) {
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perf_enable();
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@ -1702,7 +1717,7 @@ again:
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data.period = counter->hw.last_period;
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if (perf_counter_overflow(counter, 1, &data))
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if (perf_counter_overflow(counter, 1, &data, regs))
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intel_pmu_disable_counter(&counter->hw, bit);
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}
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@ -1729,7 +1744,6 @@ static int amd_pmu_handle_irq(struct pt_regs *regs)
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int idx, handled = 0;
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u64 val;
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data.regs = regs;
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data.addr = 0;
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cpuc = &__get_cpu_var(cpu_hw_counters);
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@ -1754,7 +1768,7 @@ static int amd_pmu_handle_irq(struct pt_regs *regs)
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if (!x86_perf_counter_set_period(counter, hwc, idx))
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continue;
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if (perf_counter_overflow(counter, 1, &data))
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if (perf_counter_overflow(counter, 1, &data, regs))
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amd_pmu_disable_counter(hwc, idx);
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}
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@ -691,6 +691,17 @@ struct perf_cpu_context {
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int recursion[4];
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};
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struct perf_output_handle {
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struct perf_counter *counter;
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struct perf_mmap_data *data;
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unsigned long head;
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unsigned long offset;
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int nmi;
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int sample;
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int locked;
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unsigned long flags;
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};
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#ifdef CONFIG_PERF_COUNTERS
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/*
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@ -722,16 +733,38 @@ extern int hw_perf_group_sched_in(struct perf_counter *group_leader,
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extern void perf_counter_update_userpage(struct perf_counter *counter);
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struct perf_sample_data {
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struct pt_regs *regs;
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u64 type;
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u64 ip;
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struct {
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u32 pid;
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u32 tid;
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} tid_entry;
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u64 time;
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u64 addr;
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u64 id;
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u64 stream_id;
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struct {
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u32 cpu;
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u32 reserved;
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} cpu_entry;
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u64 period;
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struct perf_callchain_entry *callchain;
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struct perf_raw_record *raw;
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};
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extern void perf_output_sample(struct perf_output_handle *handle,
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struct perf_event_header *header,
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struct perf_sample_data *data,
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struct perf_counter *counter);
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extern void perf_prepare_sample(struct perf_event_header *header,
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struct perf_sample_data *data,
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struct perf_counter *counter,
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struct pt_regs *regs);
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extern int perf_counter_overflow(struct perf_counter *counter, int nmi,
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struct perf_sample_data *data);
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extern void perf_counter_output(struct perf_counter *counter, int nmi,
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struct perf_sample_data *data);
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struct perf_sample_data *data,
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struct pt_regs *regs);
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/*
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* Return 1 for a software counter, 0 for a hardware counter
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@ -781,6 +814,12 @@ extern void perf_tpcounter_event(int event_id, u64 addr, u64 count,
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#define perf_instruction_pointer(regs) instruction_pointer(regs)
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#endif
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extern int perf_output_begin(struct perf_output_handle *handle,
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struct perf_counter *counter, unsigned int size,
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int nmi, int sample);
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extern void perf_output_end(struct perf_output_handle *handle);
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extern void perf_output_copy(struct perf_output_handle *handle,
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const void *buf, unsigned int len);
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#else
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static inline void
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perf_counter_task_sched_in(struct task_struct *task, int cpu) { }
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@ -807,7 +846,28 @@ static inline void perf_counter_mmap(struct vm_area_struct *vma) { }
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static inline void perf_counter_comm(struct task_struct *tsk) { }
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static inline void perf_counter_fork(struct task_struct *tsk) { }
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static inline void perf_counter_init(void) { }
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static inline int
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perf_output_begin(struct perf_output_handle *handle, struct perf_counter *c,
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unsigned int size, int nmi, int sample) { }
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static inline void perf_output_end(struct perf_output_handle *handle) { }
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static inline void
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perf_output_copy(struct perf_output_handle *handle,
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const void *buf, unsigned int len) { }
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static inline void
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perf_output_sample(struct perf_output_handle *handle,
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struct perf_event_header *header,
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struct perf_sample_data *data,
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struct perf_counter *counter) { }
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static inline void
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perf_prepare_sample(struct perf_event_header *header,
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struct perf_sample_data *data,
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struct perf_counter *counter,
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struct pt_regs *regs) { }
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#endif
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#define perf_output_put(handle, x) \
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perf_output_copy((handle), &(x), sizeof(x))
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#endif /* __KERNEL__ */
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#endif /* _LINUX_PERF_COUNTER_H */
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@ -2512,18 +2512,6 @@ __weak struct perf_callchain_entry *perf_callchain(struct pt_regs *regs)
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/*
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* Output
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*/
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struct perf_output_handle {
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struct perf_counter *counter;
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struct perf_mmap_data *data;
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unsigned long head;
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unsigned long offset;
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int nmi;
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int sample;
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int locked;
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unsigned long flags;
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};
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static bool perf_output_space(struct perf_mmap_data *data, unsigned long tail,
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unsigned long offset, unsigned long head)
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{
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@ -2633,8 +2621,8 @@ out:
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local_irq_restore(handle->flags);
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}
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static void perf_output_copy(struct perf_output_handle *handle,
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const void *buf, unsigned int len)
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void perf_output_copy(struct perf_output_handle *handle,
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const void *buf, unsigned int len)
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{
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unsigned int pages_mask;
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unsigned int offset;
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@ -2669,12 +2657,9 @@ static void perf_output_copy(struct perf_output_handle *handle,
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WARN_ON_ONCE(((long)(handle->head - handle->offset)) < 0);
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}
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#define perf_output_put(handle, x) \
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perf_output_copy((handle), &(x), sizeof(x))
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static int perf_output_begin(struct perf_output_handle *handle,
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struct perf_counter *counter, unsigned int size,
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int nmi, int sample)
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int perf_output_begin(struct perf_output_handle *handle,
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struct perf_counter *counter, unsigned int size,
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int nmi, int sample)
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{
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struct perf_counter *output_counter;
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struct perf_mmap_data *data;
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@ -2756,7 +2741,7 @@ out:
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return -ENOSPC;
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}
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static void perf_output_end(struct perf_output_handle *handle)
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void perf_output_end(struct perf_output_handle *handle)
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{
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struct perf_counter *counter = handle->counter;
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struct perf_mmap_data *data = handle->data;
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@ -2870,82 +2855,151 @@ static void perf_output_read(struct perf_output_handle *handle,
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perf_output_read_one(handle, counter);
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}
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void perf_counter_output(struct perf_counter *counter, int nmi,
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struct perf_sample_data *data)
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void perf_output_sample(struct perf_output_handle *handle,
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struct perf_event_header *header,
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struct perf_sample_data *data,
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struct perf_counter *counter)
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{
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u64 sample_type = data->type;
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perf_output_put(handle, *header);
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if (sample_type & PERF_SAMPLE_IP)
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perf_output_put(handle, data->ip);
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if (sample_type & PERF_SAMPLE_TID)
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perf_output_put(handle, data->tid_entry);
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if (sample_type & PERF_SAMPLE_TIME)
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perf_output_put(handle, data->time);
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if (sample_type & PERF_SAMPLE_ADDR)
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perf_output_put(handle, data->addr);
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if (sample_type & PERF_SAMPLE_ID)
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perf_output_put(handle, data->id);
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if (sample_type & PERF_SAMPLE_STREAM_ID)
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perf_output_put(handle, data->stream_id);
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if (sample_type & PERF_SAMPLE_CPU)
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perf_output_put(handle, data->cpu_entry);
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if (sample_type & PERF_SAMPLE_PERIOD)
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perf_output_put(handle, data->period);
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if (sample_type & PERF_SAMPLE_READ)
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perf_output_read(handle, counter);
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if (sample_type & PERF_SAMPLE_CALLCHAIN) {
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if (data->callchain) {
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int size = 1;
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if (data->callchain)
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size += data->callchain->nr;
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size *= sizeof(u64);
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perf_output_copy(handle, data->callchain, size);
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} else {
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u64 nr = 0;
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perf_output_put(handle, nr);
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}
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}
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if (sample_type & PERF_SAMPLE_RAW) {
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if (data->raw) {
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perf_output_put(handle, data->raw->size);
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perf_output_copy(handle, data->raw->data,
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data->raw->size);
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} else {
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struct {
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u32 size;
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u32 data;
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} raw = {
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.size = sizeof(u32),
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.data = 0,
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};
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perf_output_put(handle, raw);
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}
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}
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}
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void perf_prepare_sample(struct perf_event_header *header,
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struct perf_sample_data *data,
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struct perf_counter *counter,
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struct pt_regs *regs)
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{
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int ret;
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u64 sample_type = counter->attr.sample_type;
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struct perf_output_handle handle;
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struct perf_event_header header;
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u64 ip;
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struct {
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u32 pid, tid;
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} tid_entry;
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struct perf_callchain_entry *callchain = NULL;
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int callchain_size = 0;
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u64 time;
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struct {
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u32 cpu, reserved;
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} cpu_entry;
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header.type = PERF_EVENT_SAMPLE;
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header.size = sizeof(header);
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data->type = sample_type;
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header.misc = 0;
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header.misc |= perf_misc_flags(data->regs);
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header->type = PERF_EVENT_SAMPLE;
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header->size = sizeof(*header);
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header->misc = 0;
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header->misc |= perf_misc_flags(regs);
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if (sample_type & PERF_SAMPLE_IP) {
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ip = perf_instruction_pointer(data->regs);
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header.size += sizeof(ip);
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data->ip = perf_instruction_pointer(regs);
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header->size += sizeof(data->ip);
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}
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if (sample_type & PERF_SAMPLE_TID) {
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/* namespace issues */
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tid_entry.pid = perf_counter_pid(counter, current);
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tid_entry.tid = perf_counter_tid(counter, current);
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data->tid_entry.pid = perf_counter_pid(counter, current);
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data->tid_entry.tid = perf_counter_tid(counter, current);
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header.size += sizeof(tid_entry);
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header->size += sizeof(data->tid_entry);
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}
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if (sample_type & PERF_SAMPLE_TIME) {
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/*
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* Maybe do better on x86 and provide cpu_clock_nmi()
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*/
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time = sched_clock();
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data->time = sched_clock();
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header.size += sizeof(u64);
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header->size += sizeof(data->time);
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}
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if (sample_type & PERF_SAMPLE_ADDR)
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header.size += sizeof(u64);
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header->size += sizeof(data->addr);
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if (sample_type & PERF_SAMPLE_ID)
|
||||
header.size += sizeof(u64);
|
||||
if (sample_type & PERF_SAMPLE_ID) {
|
||||
data->id = primary_counter_id(counter);
|
||||
|
||||
if (sample_type & PERF_SAMPLE_STREAM_ID)
|
||||
header.size += sizeof(u64);
|
||||
header->size += sizeof(data->id);
|
||||
}
|
||||
|
||||
if (sample_type & PERF_SAMPLE_STREAM_ID) {
|
||||
data->stream_id = counter->id;
|
||||
|
||||
header->size += sizeof(data->stream_id);
|
||||
}
|
||||
|
||||
if (sample_type & PERF_SAMPLE_CPU) {
|
||||
header.size += sizeof(cpu_entry);
|
||||
data->cpu_entry.cpu = raw_smp_processor_id();
|
||||
data->cpu_entry.reserved = 0;
|
||||
|
||||
cpu_entry.cpu = raw_smp_processor_id();
|
||||
cpu_entry.reserved = 0;
|
||||
header->size += sizeof(data->cpu_entry);
|
||||
}
|
||||
|
||||
if (sample_type & PERF_SAMPLE_PERIOD)
|
||||
header.size += sizeof(u64);
|
||||
header->size += sizeof(data->period);
|
||||
|
||||
if (sample_type & PERF_SAMPLE_READ)
|
||||
header.size += perf_counter_read_size(counter);
|
||||
header->size += perf_counter_read_size(counter);
|
||||
|
||||
if (sample_type & PERF_SAMPLE_CALLCHAIN) {
|
||||
callchain = perf_callchain(data->regs);
|
||||
int size = 1;
|
||||
|
||||
if (callchain) {
|
||||
callchain_size = (1 + callchain->nr) * sizeof(u64);
|
||||
header.size += callchain_size;
|
||||
} else
|
||||
header.size += sizeof(u64);
|
||||
data->callchain = perf_callchain(regs);
|
||||
|
||||
if (data->callchain)
|
||||
size += data->callchain->nr;
|
||||
|
||||
header->size += size * sizeof(u64);
|
||||
}
|
||||
|
||||
if (sample_type & PERF_SAMPLE_RAW) {
|
||||
|
|
@ -2957,69 +3011,23 @@ void perf_counter_output(struct perf_counter *counter, int nmi,
|
|||
size += sizeof(u32);
|
||||
|
||||
WARN_ON_ONCE(size & (sizeof(u64)-1));
|
||||
header.size += size;
|
||||
header->size += size;
|
||||
}
|
||||
}
|
||||
|
||||
ret = perf_output_begin(&handle, counter, header.size, nmi, 1);
|
||||
if (ret)
|
||||
static void perf_counter_output(struct perf_counter *counter, int nmi,
|
||||
struct perf_sample_data *data,
|
||||
struct pt_regs *regs)
|
||||
{
|
||||
struct perf_output_handle handle;
|
||||
struct perf_event_header header;
|
||||
|
||||
perf_prepare_sample(&header, data, counter, regs);
|
||||
|
||||
if (perf_output_begin(&handle, counter, header.size, nmi, 1))
|
||||
return;
|
||||
|
||||
perf_output_put(&handle, header);
|
||||
|
||||
if (sample_type & PERF_SAMPLE_IP)
|
||||
perf_output_put(&handle, ip);
|
||||
|
||||
if (sample_type & PERF_SAMPLE_TID)
|
||||
perf_output_put(&handle, tid_entry);
|
||||
|
||||
if (sample_type & PERF_SAMPLE_TIME)
|
||||
perf_output_put(&handle, time);
|
||||
|
||||
if (sample_type & PERF_SAMPLE_ADDR)
|
||||
perf_output_put(&handle, data->addr);
|
||||
|
||||
if (sample_type & PERF_SAMPLE_ID) {
|
||||
u64 id = primary_counter_id(counter);
|
||||
|
||||
perf_output_put(&handle, id);
|
||||
}
|
||||
|
||||
if (sample_type & PERF_SAMPLE_STREAM_ID)
|
||||
perf_output_put(&handle, counter->id);
|
||||
|
||||
if (sample_type & PERF_SAMPLE_CPU)
|
||||
perf_output_put(&handle, cpu_entry);
|
||||
|
||||
if (sample_type & PERF_SAMPLE_PERIOD)
|
||||
perf_output_put(&handle, data->period);
|
||||
|
||||
if (sample_type & PERF_SAMPLE_READ)
|
||||
perf_output_read(&handle, counter);
|
||||
|
||||
if (sample_type & PERF_SAMPLE_CALLCHAIN) {
|
||||
if (callchain)
|
||||
perf_output_copy(&handle, callchain, callchain_size);
|
||||
else {
|
||||
u64 nr = 0;
|
||||
perf_output_put(&handle, nr);
|
||||
}
|
||||
}
|
||||
|
||||
if (sample_type & PERF_SAMPLE_RAW) {
|
||||
if (data->raw) {
|
||||
perf_output_put(&handle, data->raw->size);
|
||||
perf_output_copy(&handle, data->raw->data, data->raw->size);
|
||||
} else {
|
||||
struct {
|
||||
u32 size;
|
||||
u32 data;
|
||||
} raw = {
|
||||
.size = sizeof(u32),
|
||||
.data = 0,
|
||||
};
|
||||
perf_output_put(&handle, raw);
|
||||
}
|
||||
}
|
||||
perf_output_sample(&handle, &header, data, counter);
|
||||
|
||||
perf_output_end(&handle);
|
||||
}
|
||||
|
|
@ -3501,7 +3509,8 @@ static void perf_log_throttle(struct perf_counter *counter, int enable)
|
|||
*/
|
||||
|
||||
static int __perf_counter_overflow(struct perf_counter *counter, int nmi,
|
||||
int throttle, struct perf_sample_data *data)
|
||||
int throttle, struct perf_sample_data *data,
|
||||
struct pt_regs *regs)
|
||||
{
|
||||
int events = atomic_read(&counter->event_limit);
|
||||
struct hw_perf_counter *hwc = &counter->hw;
|
||||
|
|
@ -3557,14 +3566,15 @@ static int __perf_counter_overflow(struct perf_counter *counter, int nmi,
|
|||
perf_counter_disable(counter);
|
||||
}
|
||||
|
||||
perf_counter_output(counter, nmi, data);
|
||||
perf_counter_output(counter, nmi, data, regs);
|
||||
return ret;
|
||||
}
|
||||
|
||||
int perf_counter_overflow(struct perf_counter *counter, int nmi,
|
||||
struct perf_sample_data *data)
|
||||
struct perf_sample_data *data,
|
||||
struct pt_regs *regs)
|
||||
{
|
||||
return __perf_counter_overflow(counter, nmi, 1, data);
|
||||
return __perf_counter_overflow(counter, nmi, 1, data, regs);
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -3602,7 +3612,8 @@ again:
|
|||
}
|
||||
|
||||
static void perf_swcounter_overflow(struct perf_counter *counter,
|
||||
int nmi, struct perf_sample_data *data)
|
||||
int nmi, struct perf_sample_data *data,
|
||||
struct pt_regs *regs)
|
||||
{
|
||||
struct hw_perf_counter *hwc = &counter->hw;
|
||||
int throttle = 0;
|
||||
|
|
@ -3615,7 +3626,8 @@ static void perf_swcounter_overflow(struct perf_counter *counter,
|
|||
return;
|
||||
|
||||
for (; overflow; overflow--) {
|
||||
if (__perf_counter_overflow(counter, nmi, throttle, data)) {
|
||||
if (__perf_counter_overflow(counter, nmi, throttle,
|
||||
data, regs)) {
|
||||
/*
|
||||
* We inhibit the overflow from happening when
|
||||
* hwc->interrupts == MAX_INTERRUPTS.
|
||||
|
|
@ -3634,7 +3646,8 @@ static void perf_swcounter_unthrottle(struct perf_counter *counter)
|
|||
}
|
||||
|
||||
static void perf_swcounter_add(struct perf_counter *counter, u64 nr,
|
||||
int nmi, struct perf_sample_data *data)
|
||||
int nmi, struct perf_sample_data *data,
|
||||
struct pt_regs *regs)
|
||||
{
|
||||
struct hw_perf_counter *hwc = &counter->hw;
|
||||
|
||||
|
|
@ -3643,11 +3656,11 @@ static void perf_swcounter_add(struct perf_counter *counter, u64 nr,
|
|||
if (!hwc->sample_period)
|
||||
return;
|
||||
|
||||
if (!data->regs)
|
||||
if (!regs)
|
||||
return;
|
||||
|
||||
if (!atomic64_add_negative(nr, &hwc->period_left))
|
||||
perf_swcounter_overflow(counter, nmi, data);
|
||||
perf_swcounter_overflow(counter, nmi, data, regs);
|
||||
}
|
||||
|
||||
static int perf_swcounter_is_counting(struct perf_counter *counter)
|
||||
|
|
@ -3706,7 +3719,8 @@ static int perf_swcounter_match(struct perf_counter *counter,
|
|||
static void perf_swcounter_ctx_event(struct perf_counter_context *ctx,
|
||||
enum perf_type_id type,
|
||||
u32 event, u64 nr, int nmi,
|
||||
struct perf_sample_data *data)
|
||||
struct perf_sample_data *data,
|
||||
struct pt_regs *regs)
|
||||
{
|
||||
struct perf_counter *counter;
|
||||
|
||||
|
|
@ -3715,8 +3729,8 @@ static void perf_swcounter_ctx_event(struct perf_counter_context *ctx,
|
|||
|
||||
rcu_read_lock();
|
||||
list_for_each_entry_rcu(counter, &ctx->event_list, event_entry) {
|
||||
if (perf_swcounter_match(counter, type, event, data->regs))
|
||||
perf_swcounter_add(counter, nr, nmi, data);
|
||||
if (perf_swcounter_match(counter, type, event, regs))
|
||||
perf_swcounter_add(counter, nr, nmi, data, regs);
|
||||
}
|
||||
rcu_read_unlock();
|
||||
}
|
||||
|
|
@ -3737,7 +3751,8 @@ static int *perf_swcounter_recursion_context(struct perf_cpu_context *cpuctx)
|
|||
|
||||
static void do_perf_swcounter_event(enum perf_type_id type, u32 event,
|
||||
u64 nr, int nmi,
|
||||
struct perf_sample_data *data)
|
||||
struct perf_sample_data *data,
|
||||
struct pt_regs *regs)
|
||||
{
|
||||
struct perf_cpu_context *cpuctx = &get_cpu_var(perf_cpu_context);
|
||||
int *recursion = perf_swcounter_recursion_context(cpuctx);
|
||||
|
|
@ -3750,7 +3765,7 @@ static void do_perf_swcounter_event(enum perf_type_id type, u32 event,
|
|||
barrier();
|
||||
|
||||
perf_swcounter_ctx_event(&cpuctx->ctx, type, event,
|
||||
nr, nmi, data);
|
||||
nr, nmi, data, regs);
|
||||
rcu_read_lock();
|
||||
/*
|
||||
* doesn't really matter which of the child contexts the
|
||||
|
|
@ -3758,7 +3773,7 @@ static void do_perf_swcounter_event(enum perf_type_id type, u32 event,
|
|||
*/
|
||||
ctx = rcu_dereference(current->perf_counter_ctxp);
|
||||
if (ctx)
|
||||
perf_swcounter_ctx_event(ctx, type, event, nr, nmi, data);
|
||||
perf_swcounter_ctx_event(ctx, type, event, nr, nmi, data, regs);
|
||||
rcu_read_unlock();
|
||||
|
||||
barrier();
|
||||
|
|
@ -3772,11 +3787,11 @@ void __perf_swcounter_event(u32 event, u64 nr, int nmi,
|
|||
struct pt_regs *regs, u64 addr)
|
||||
{
|
||||
struct perf_sample_data data = {
|
||||
.regs = regs,
|
||||
.addr = addr,
|
||||
};
|
||||
|
||||
do_perf_swcounter_event(PERF_TYPE_SOFTWARE, event, nr, nmi, &data);
|
||||
do_perf_swcounter_event(PERF_TYPE_SOFTWARE, event, nr, nmi,
|
||||
&data, regs);
|
||||
}
|
||||
|
||||
static void perf_swcounter_read(struct perf_counter *counter)
|
||||
|
|
@ -3813,6 +3828,7 @@ static enum hrtimer_restart perf_swcounter_hrtimer(struct hrtimer *hrtimer)
|
|||
{
|
||||
enum hrtimer_restart ret = HRTIMER_RESTART;
|
||||
struct perf_sample_data data;
|
||||
struct pt_regs *regs;
|
||||
struct perf_counter *counter;
|
||||
u64 period;
|
||||
|
||||
|
|
@ -3820,17 +3836,17 @@ static enum hrtimer_restart perf_swcounter_hrtimer(struct hrtimer *hrtimer)
|
|||
counter->pmu->read(counter);
|
||||
|
||||
data.addr = 0;
|
||||
data.regs = get_irq_regs();
|
||||
regs = get_irq_regs();
|
||||
/*
|
||||
* In case we exclude kernel IPs or are somehow not in interrupt
|
||||
* context, provide the next best thing, the user IP.
|
||||
*/
|
||||
if ((counter->attr.exclude_kernel || !data.regs) &&
|
||||
if ((counter->attr.exclude_kernel || !regs) &&
|
||||
!counter->attr.exclude_user)
|
||||
data.regs = task_pt_regs(current);
|
||||
regs = task_pt_regs(current);
|
||||
|
||||
if (data.regs) {
|
||||
if (perf_counter_overflow(counter, 0, &data))
|
||||
if (regs) {
|
||||
if (perf_counter_overflow(counter, 0, &data, regs))
|
||||
ret = HRTIMER_NORESTART;
|
||||
}
|
||||
|
||||
|
|
@ -3966,15 +3982,17 @@ void perf_tpcounter_event(int event_id, u64 addr, u64 count, void *record,
|
|||
};
|
||||
|
||||
struct perf_sample_data data = {
|
||||
.regs = get_irq_regs(),
|
||||
.addr = addr,
|
||||
.raw = &raw,
|
||||
};
|
||||
|
||||
if (!data.regs)
|
||||
data.regs = task_pt_regs(current);
|
||||
struct pt_regs *regs = get_irq_regs();
|
||||
|
||||
do_perf_swcounter_event(PERF_TYPE_TRACEPOINT, event_id, count, 1, &data);
|
||||
if (!regs)
|
||||
regs = task_pt_regs(current);
|
||||
|
||||
do_perf_swcounter_event(PERF_TYPE_TRACEPOINT, event_id, count, 1,
|
||||
&data, regs);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(perf_tpcounter_event);
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue