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Nothing major this round. Mostly small clean ups and fixes. 

Some visible changes:
 
  A new flag was added to distinguish traces done in NMI context.
 
  Preempt tracer now shows functions where preemption is disabled but
  interrupts are still enabled.
 
 Other notes:
 
  Updates were done to function tracing to allow better performance
  with perf.
 
  Infrastructure code has been added to allow for a new histogram
  feature for recording live trace event histograms that can be
  configured by simple user commands. The feature itself was just
  finished, but needs a round in linux-next before being pulled.
  This only includes some infrastructure changes that will be needed.
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Merge tag 'trace-v4.6' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull tracing updates from Steven Rostedt:
 "Nothing major this round.  Mostly small clean ups and fixes.

  Some visible changes:

   - A new flag was added to distinguish traces done in NMI context.

   - Preempt tracer now shows functions where preemption is disabled but
     interrupts are still enabled.

  Other notes:

   - Updates were done to function tracing to allow better performance
     with perf.

   - Infrastructure code has been added to allow for a new histogram
     feature for recording live trace event histograms that can be
     configured by simple user commands.  The feature itself was just
     finished, but needs a round in linux-next before being pulled.

     This only includes some infrastructure changes that will be needed"

* tag 'trace-v4.6' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (22 commits)
  tracing: Record and show NMI state
  tracing: Fix trace_printk() to print when not using bprintk()
  tracing: Remove redundant reset per-CPU buff in irqsoff tracer
  x86: ftrace: Fix the misleading comment for arch/x86/kernel/ftrace.c
  tracing: Fix crash from reading trace_pipe with sendfile
  tracing: Have preempt(irqs)off trace preempt disabled functions
  tracing: Fix return while holding a lock in register_tracer()
  ftrace: Use kasprintf() in ftrace_profile_tracefs()
  ftrace: Update dynamic ftrace calls only if necessary
  ftrace: Make ftrace_hash_rec_enable return update bool
  tracing: Fix typoes in code comment and printk in trace_nop.c
  tracing, writeback: Replace cgroup path to cgroup ino
  tracing: Use flags instead of bool in trigger structure
  tracing: Add an unreg_all() callback to trigger commands
  tracing: Add needs_rec flag to event triggers
  tracing: Add a per-event-trigger 'paused' field
  tracing: Add get_syscall_name()
  tracing: Add event record param to trigger_ops.func()
  tracing: Make event trigger functions available
  tracing: Make ftrace_event_field checking functions available
  ...
This commit is contained in:
Linus Torvalds 2016-03-24 10:52:25 -07:00
parent faea72dd0f 7e6867bf83
commit e46b4e2b46
17 changed files with 280 additions and 235 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/kernel/ftrace.c
View File

@ -1,5 +1,5 @@
/*
* Code for replacing ftrace calls with jumps.
* Dynamic function tracing support.
*
* Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com>
*

6
include/linux/kernel.h
View File

@ -618,7 +618,7 @@ do { \
#define do_trace_printk(fmt, args...) \
do { \
static const char *trace_printk_fmt \
static const char *trace_printk_fmt __used \
__attribute__((section("__trace_printk_fmt"))) = \
__builtin_constant_p(fmt) ? fmt : NULL; \
\
@ -662,7 +662,7 @@ int __trace_printk(unsigned long ip, const char *fmt, ...);
*/
#define trace_puts(str) ({ \
static const char *trace_printk_fmt \
static const char *trace_printk_fmt __used \
__attribute__((section("__trace_printk_fmt"))) = \
__builtin_constant_p(str) ? str : NULL; \
\
@ -684,7 +684,7 @@ extern void trace_dump_stack(int skip);
#define ftrace_vprintk(fmt, vargs) \
do { \
if (__builtin_constant_p(fmt)) { \
static const char *trace_printk_fmt \
static const char *trace_printk_fmt __used \
__attribute__((section("__trace_printk_fmt"))) = \
__builtin_constant_p(fmt) ? fmt : NULL; \
\

7
include/linux/trace_events.h
View File

@ -420,7 +420,8 @@ extern int call_filter_check_discard(struct trace_event_call *call, void *rec,
extern enum event_trigger_type event_triggers_call(struct trace_event_file *file,
void *rec);
extern void event_triggers_post_call(struct trace_event_file *file,
enum event_trigger_type tt);
enum event_trigger_type tt,
void *rec);
bool trace_event_ignore_this_pid(struct trace_event_file *trace_file);
@ -507,7 +508,7 @@ event_trigger_unlock_commit(struct trace_event_file *file,
trace_buffer_unlock_commit(file->tr, buffer, event, irq_flags, pc);
if (tt)
event_triggers_post_call(file, tt);
event_triggers_post_call(file, tt, entry);
}
/**
@ -540,7 +541,7 @@ event_trigger_unlock_commit_regs(struct trace_event_file *file,
irq_flags, pc, regs);
if (tt)
event_triggers_post_call(file, tt);
event_triggers_post_call(file, tt, entry);
}
#ifdef CONFIG_BPF_EVENTS

42
include/trace/events/kmem.h
View File

@ -140,42 +140,19 @@ DEFINE_EVENT(kmem_free, kfree,
TP_ARGS(call_site, ptr)
);
DEFINE_EVENT_CONDITION(kmem_free, kmem_cache_free,
DEFINE_EVENT(kmem_free, kmem_cache_free,
TP_PROTO(unsigned long call_site, const void *ptr),
TP_ARGS(call_site, ptr),
/*
* This trace can be potentially called from an offlined cpu.
* Since trace points use RCU and RCU should not be used from
* offline cpus, filter such calls out.
* While this trace can be called from a preemptable section,
* it has no impact on the condition since tasks can migrate
* only from online cpus to other online cpus. Thus its safe
* to use raw_smp_processor_id.
*/
TP_CONDITION(cpu_online(raw_smp_processor_id()))
TP_ARGS(call_site, ptr)
);
TRACE_EVENT_CONDITION(mm_page_free,
TRACE_EVENT(mm_page_free,
TP_PROTO(struct page *page, unsigned int order),
TP_ARGS(page, order),
/*
* This trace can be potentially called from an offlined cpu.
* Since trace points use RCU and RCU should not be used from
* offline cpus, filter such calls out.
* While this trace can be called from a preemptable section,
* it has no impact on the condition since tasks can migrate
* only from online cpus to other online cpus. Thus its safe
* to use raw_smp_processor_id.
*/
TP_CONDITION(cpu_online(raw_smp_processor_id())),
TP_STRUCT__entry(
__field( unsigned long, pfn )
__field( unsigned int, order )
@ -276,23 +253,12 @@ DEFINE_EVENT(mm_page, mm_page_alloc_zone_locked,
TP_ARGS(page, order, migratetype)
);
TRACE_EVENT_CONDITION(mm_page_pcpu_drain,
TRACE_EVENT(mm_page_pcpu_drain,
TP_PROTO(struct page *page, unsigned int order, int migratetype),
TP_ARGS(page, order, migratetype),
/*
* This trace can be potentially called from an offlined cpu.
* Since trace points use RCU and RCU should not be used from
* offline cpus, filter such calls out.
* While this trace can be called from a preemptable section,
* it has no impact on the condition since tasks can migrate
* only from online cpus to other online cpus. Thus its safe
* to use raw_smp_processor_id.
*/
TP_CONDITION(cpu_online(raw_smp_processor_id())),
TP_STRUCT__entry(
__field( unsigned long, pfn )
__field( unsigned int, order )

4
include/trace/events/tlb.h
View File

@ -34,13 +34,11 @@ TLB_FLUSH_REASON
#define EM(a,b) { a, b },
#define EMe(a,b) { a, b }
TRACE_EVENT_CONDITION(tlb_flush,
TRACE_EVENT(tlb_flush,
TP_PROTO(int reason, unsigned long pages),
TP_ARGS(reason, pages),
TP_CONDITION(cpu_online(smp_processor_id())),
TP_STRUCT__entry(
__field( int, reason)
__field(unsigned long, pages)

121
include/trace/events/writeback.h
View File

@ -134,58 +134,28 @@ DEFINE_EVENT(writeback_dirty_inode_template, writeback_dirty_inode,
#ifdef CREATE_TRACE_POINTS
#ifdef CONFIG_CGROUP_WRITEBACK
static inline size_t __trace_wb_cgroup_size(struct bdi_writeback *wb)
static inline unsigned int __trace_wb_assign_cgroup(struct bdi_writeback *wb)
{
return kernfs_path_len(wb->memcg_css->cgroup->kn) + 1;
return wb->memcg_css->cgroup->kn->ino;
}
static inline void __trace_wb_assign_cgroup(char *buf, struct bdi_writeback *wb)
{
struct cgroup *cgrp = wb->memcg_css->cgroup;
char *path;
path = cgroup_path(cgrp, buf, kernfs_path_len(cgrp->kn) + 1);
WARN_ON_ONCE(path != buf);
}
static inline size_t __trace_wbc_cgroup_size(struct writeback_control *wbc)
static inline unsigned int __trace_wbc_assign_cgroup(struct writeback_control *wbc)
{
if (wbc->wb)
return __trace_wb_cgroup_size(wbc->wb);
return __trace_wb_assign_cgroup(wbc->wb);
else
return 2;
return -1U;
}
static inline void __trace_wbc_assign_cgroup(char *buf,
struct writeback_control *wbc)
{
if (wbc->wb)
__trace_wb_assign_cgroup(buf, wbc->wb);
else
strcpy(buf, "/");
}
#else /* CONFIG_CGROUP_WRITEBACK */
static inline size_t __trace_wb_cgroup_size(struct bdi_writeback *wb)
static inline unsigned int __trace_wb_assign_cgroup(struct bdi_writeback *wb)
{
return 2;
return -1U;
}
static inline void __trace_wb_assign_cgroup(char *buf, struct bdi_writeback *wb)
static inline unsigned int __trace_wbc_assign_cgroup(struct writeback_control *wbc)
{
strcpy(buf, "/");
}
static inline size_t __trace_wbc_cgroup_size(struct writeback_control *wbc)
{
return 2;
}
static inline void __trace_wbc_assign_cgroup(char *buf,
struct writeback_control *wbc)
{
strcpy(buf, "/");
return -1U;
}
#endif /* CONFIG_CGROUP_WRITEBACK */
@ -201,7 +171,7 @@ DECLARE_EVENT_CLASS(writeback_write_inode_template,
__array(char, name, 32)
__field(unsigned long, ino)
__field(int, sync_mode)
__dynamic_array(char, cgroup, __trace_wbc_cgroup_size(wbc))
__field(unsigned int, cgroup_ino)
),
TP_fast_assign(
@ -209,14 +179,14 @@ DECLARE_EVENT_CLASS(writeback_write_inode_template,
dev_name(inode_to_bdi(inode)->dev), 32);
__entry->ino = inode->i_ino;
__entry->sync_mode = wbc->sync_mode;
__trace_wbc_assign_cgroup(__get_str(cgroup), wbc);
__entry->cgroup_ino = __trace_wbc_assign_cgroup(wbc);
),
TP_printk("bdi %s: ino=%lu sync_mode=%d cgroup=%s",
TP_printk("bdi %s: ino=%lu sync_mode=%d cgroup_ino=%u",
__entry->name,
__entry->ino,
__entry->sync_mode,
__get_str(cgroup)
__entry->cgroup_ino
)
);
@ -246,7 +216,7 @@ DECLARE_EVENT_CLASS(writeback_work_class,
__field(int, range_cyclic)
__field(int, for_background)
__field(int, reason)
__dynamic_array(char, cgroup, __trace_wb_cgroup_size(wb))
__field(unsigned int, cgroup_ino)
),
TP_fast_assign(
strncpy(__entry->name,
@ -258,10 +228,10 @@ DECLARE_EVENT_CLASS(writeback_work_class,
__entry->range_cyclic = work->range_cyclic;
__entry->for_background = work->for_background;
__entry->reason = work->reason;
__trace_wb_assign_cgroup(__get_str(cgroup), wb);
__entry->cgroup_ino = __trace_wb_assign_cgroup(wb);
),
TP_printk("bdi %s: sb_dev %d:%d nr_pages=%ld sync_mode=%d "
"kupdate=%d range_cyclic=%d background=%d reason=%s cgroup=%s",
"kupdate=%d range_cyclic=%d background=%d reason=%s cgroup_ino=%u",
__entry->name,
MAJOR(__entry->sb_dev), MINOR(__entry->sb_dev),
__entry->nr_pages,
@ -270,7 +240,7 @@ DECLARE_EVENT_CLASS(writeback_work_class,
__entry->range_cyclic,
__entry->for_background,
__print_symbolic(__entry->reason, WB_WORK_REASON),
__get_str(cgroup)
__entry->cgroup_ino
)
);
#define DEFINE_WRITEBACK_WORK_EVENT(name) \
@ -300,15 +270,15 @@ DECLARE_EVENT_CLASS(writeback_class,
TP_ARGS(wb),
TP_STRUCT__entry(
__array(char, name, 32)
__dynamic_array(char, cgroup, __trace_wb_cgroup_size(wb))
__field(unsigned int, cgroup_ino)
),
TP_fast_assign(
strncpy(__entry->name, dev_name(wb->bdi->dev), 32);
__trace_wb_assign_cgroup(__get_str(cgroup), wb);
__entry->cgroup_ino = __trace_wb_assign_cgroup(wb);
),
TP_printk("bdi %s: cgroup=%s",
TP_printk("bdi %s: cgroup_ino=%u",
__entry->name,
__get_str(cgroup)
__entry->cgroup_ino
)
);
#define DEFINE_WRITEBACK_EVENT(name) \
@ -347,7 +317,7 @@ DECLARE_EVENT_CLASS(wbc_class,
__field(int, range_cyclic)
__field(long, range_start)
__field(long, range_end)
__dynamic_array(char, cgroup, __trace_wbc_cgroup_size(wbc))
__field(unsigned int, cgroup_ino)
),
TP_fast_assign(
@ -361,12 +331,12 @@ DECLARE_EVENT_CLASS(wbc_class,
__entry->range_cyclic = wbc->range_cyclic;
__entry->range_start = (long)wbc->range_start;
__entry->range_end = (long)wbc->range_end;
__trace_wbc_assign_cgroup(__get_str(cgroup), wbc);
__entry->cgroup_ino = __trace_wbc_assign_cgroup(wbc);
),
TP_printk("bdi %s: towrt=%ld skip=%ld mode=%d kupd=%d "
"bgrd=%d reclm=%d cyclic=%d "
"start=0x%lx end=0x%lx cgroup=%s",
"start=0x%lx end=0x%lx cgroup_ino=%u",
__entry->name,
__entry->nr_to_write,
__entry->pages_skipped,
@ -377,7 +347,7 @@ DECLARE_EVENT_CLASS(wbc_class,
__entry->range_cyclic,
__entry->range_start,
__entry->range_end,
__get_str(cgroup)
__entry->cgroup_ino
)
)
@ -398,7 +368,7 @@ TRACE_EVENT(writeback_queue_io,
__field(long, age)
__field(int, moved)
__field(int, reason)
__dynamic_array(char, cgroup, __trace_wb_cgroup_size(wb))
__field(unsigned int, cgroup_ino)
),
TP_fast_assign(
unsigned long *older_than_this = work->older_than_this;
@ -408,15 +378,15 @@ TRACE_EVENT(writeback_queue_io,
(jiffies - *older_than_this) * 1000 / HZ : -1;
__entry->moved = moved;
__entry->reason = work->reason;
__trace_wb_assign_cgroup(__get_str(cgroup), wb);
__entry->cgroup_ino = __trace_wb_assign_cgroup(wb);
),
TP_printk("bdi %s: older=%lu age=%ld enqueue=%d reason=%s cgroup=%s",
TP_printk("bdi %s: older=%lu age=%ld enqueue=%d reason=%s cgroup_ino=%u",
__entry->name,
__entry->older, /* older_than_this in jiffies */
__entry->age, /* older_than_this in relative milliseconds */
__entry->moved,
__print_symbolic(__entry->reason, WB_WORK_REASON),
__get_str(cgroup)
__entry->cgroup_ino
)
);
@ -484,7 +454,7 @@ TRACE_EVENT(bdi_dirty_ratelimit,
__field(unsigned long, dirty_ratelimit)
__field(unsigned long, task_ratelimit)
__field(unsigned long, balanced_dirty_ratelimit)
__dynamic_array(char, cgroup, __trace_wb_cgroup_size(wb))
__field(unsigned int, cgroup_ino)
),
TP_fast_assign(
@ -496,13 +466,13 @@ TRACE_EVENT(bdi_dirty_ratelimit,
__entry->task_ratelimit = KBps(task_ratelimit);
__entry->balanced_dirty_ratelimit =
KBps(wb->balanced_dirty_ratelimit);
__trace_wb_assign_cgroup(__get_str(cgroup), wb);
__entry->cgroup_ino = __trace_wb_assign_cgroup(wb);
),
TP_printk("bdi %s: "
"write_bw=%lu awrite_bw=%lu dirty_rate=%lu "
"dirty_ratelimit=%lu task_ratelimit=%lu "
"balanced_dirty_ratelimit=%lu cgroup=%s",
"balanced_dirty_ratelimit=%lu cgroup_ino=%u",
__entry->bdi,
__entry->write_bw, /* write bandwidth */
__entry->avg_write_bw, /* avg write bandwidth */
@ -510,7 +480,7 @@ TRACE_EVENT(bdi_dirty_ratelimit,
__entry->dirty_ratelimit, /* base ratelimit */
__entry->task_ratelimit, /* ratelimit with position control */
__entry->balanced_dirty_ratelimit, /* the balanced ratelimit */
__get_str(cgroup)
__entry->cgroup_ino
)
);
@ -548,7 +518,7 @@ TRACE_EVENT(balance_dirty_pages,
__field( long, pause)
__field(unsigned long, period)
__field( long, think)
__dynamic_array(char, cgroup, __trace_wb_cgroup_size(wb))
__field(unsigned int, cgroup_ino)
),
TP_fast_assign(
@ -571,7 +541,7 @@ TRACE_EVENT(balance_dirty_pages,
__entry->period = period * 1000 / HZ;
__entry->pause = pause * 1000 / HZ;
__entry->paused = (jiffies - start_time) * 1000 / HZ;
__trace_wb_assign_cgroup(__get_str(cgroup), wb);
__entry->cgroup_ino = __trace_wb_assign_cgroup(wb);
),
@ -580,7 +550,7 @@ TRACE_EVENT(balance_dirty_pages,
"bdi_setpoint=%lu bdi_dirty=%lu "
"dirty_ratelimit=%lu task_ratelimit=%lu "
"dirtied=%u dirtied_pause=%u "
"paused=%lu pause=%ld period=%lu think=%ld cgroup=%s",
"paused=%lu pause=%ld period=%lu think=%ld cgroup_ino=%u",
__entry->bdi,
__entry->limit,
__entry->setpoint,
@ -595,7 +565,7 @@ TRACE_EVENT(balance_dirty_pages,
__entry->pause, /* ms */
__entry->period, /* ms */
__entry->think, /* ms */
__get_str(cgroup)
__entry->cgroup_ino
)
);
@ -609,8 +579,7 @@ TRACE_EVENT(writeback_sb_inodes_requeue,
__field(unsigned long, ino)
__field(unsigned long, state)
__field(unsigned long, dirtied_when)
__dynamic_array(char, cgroup,
__trace_wb_cgroup_size(inode_to_wb(inode)))
__field(unsigned int, cgroup_ino)
),
TP_fast_assign(
@ -619,16 +588,16 @@ TRACE_EVENT(writeback_sb_inodes_requeue,
__entry->ino = inode->i_ino;
__entry->state = inode->i_state;
__entry->dirtied_when = inode->dirtied_when;
__trace_wb_assign_cgroup(__get_str(cgroup), inode_to_wb(inode));
__entry->cgroup_ino = __trace_wb_assign_cgroup(inode_to_wb(inode));
),
TP_printk("bdi %s: ino=%lu state=%s dirtied_when=%lu age=%lu cgroup=%s",
TP_printk("bdi %s: ino=%lu state=%s dirtied_when=%lu age=%lu cgroup_ino=%u",
__entry->name,
__entry->ino,
show_inode_state(__entry->state),
__entry->dirtied_when,
(jiffies - __entry->dirtied_when) / HZ,
__get_str(cgroup)
__entry->cgroup_ino
)
);
@ -684,7 +653,7 @@ DECLARE_EVENT_CLASS(writeback_single_inode_template,
__field(unsigned long, writeback_index)
__field(long, nr_to_write)
__field(unsigned long, wrote)
__dynamic_array(char, cgroup, __trace_wbc_cgroup_size(wbc))
__field(unsigned int, cgroup_ino)
),
TP_fast_assign(
@ -696,11 +665,11 @@ DECLARE_EVENT_CLASS(writeback_single_inode_template,
__entry->writeback_index = inode->i_mapping->writeback_index;
__entry->nr_to_write = nr_to_write;
__entry->wrote = nr_to_write - wbc->nr_to_write;
__trace_wbc_assign_cgroup(__get_str(cgroup), wbc);
__entry->cgroup_ino = __trace_wbc_assign_cgroup(wbc);
),
TP_printk("bdi %s: ino=%lu state=%s dirtied_when=%lu age=%lu "
"index=%lu to_write=%ld wrote=%lu cgroup=%s",
"index=%lu to_write=%ld wrote=%lu cgroup_ino=%u",
__entry->name,
__entry->ino,
show_inode_state(__entry->state),
@ -709,7 +678,7 @@ DECLARE_EVENT_CLASS(writeback_single_inode_template,
__entry->writeback_index,
__entry->nr_to_write,
__entry->wrote,
__get_str(cgroup)
__entry->cgroup_ino
)
);

41
kernel/trace/ftrace.c
View File

@ -1030,8 +1030,7 @@ static __init void ftrace_profile_tracefs(struct dentry *d_tracer)
for_each_possible_cpu(cpu) {
stat = &per_cpu(ftrace_profile_stats, cpu);
/* allocate enough for function name + cpu number */
name = kmalloc(32, GFP_KERNEL);
name = kasprintf(GFP_KERNEL, "function%d", cpu);
if (!name) {
/*
* The files created are permanent, if something happens
@ -1043,7 +1042,6 @@ static __init void ftrace_profile_tracefs(struct dentry *d_tracer)
return;
}
stat->stat = function_stats;
snprintf(name, 32, "function%d", cpu);
stat->stat.name = name;
ret = register_stat_tracer(&stat->stat);
if (ret) {
@ -1609,7 +1607,7 @@ static bool test_rec_ops_needs_regs(struct dyn_ftrace *rec)
return keep_regs;
}
static void __ftrace_hash_rec_update(struct ftrace_ops *ops,
static bool __ftrace_hash_rec_update(struct ftrace_ops *ops,
int filter_hash,
bool inc)
{
@ -1617,12 +1615,13 @@ static void __ftrace_hash_rec_update(struct ftrace_ops *ops,
struct ftrace_hash *other_hash;
struct ftrace_page *pg;
struct dyn_ftrace *rec;
bool update = false;
int count = 0;
int all = 0;
/* Only update if the ops has been registered */
if (!(ops->flags & FTRACE_OPS_FL_ENABLED))
return;
return false;
/*
* In the filter_hash case:
@ -1649,7 +1648,7 @@ static void __ftrace_hash_rec_update(struct ftrace_ops *ops,
* then there's nothing to do.
*/
if (ftrace_hash_empty(hash))
return;
return false;
}
do_for_each_ftrace_rec(pg, rec) {
@ -1693,7 +1692,7 @@ static void __ftrace_hash_rec_update(struct ftrace_ops *ops,
if (inc) {
rec->flags++;
if (FTRACE_WARN_ON(ftrace_rec_count(rec) == FTRACE_REF_MAX))
return;
return false;
/*
* If there's only a single callback registered to a
@ -1719,7 +1718,7 @@ static void __ftrace_hash_rec_update(struct ftrace_ops *ops,
rec->flags |= FTRACE_FL_REGS;
} else {
if (FTRACE_WARN_ON(ftrace_rec_count(rec) == 0))
return;
return false;
rec->flags--;
/*
@ -1752,22 +1751,28 @@ static void __ftrace_hash_rec_update(struct ftrace_ops *ops,
*/
}
count++;
/* Must match FTRACE_UPDATE_CALLS in ftrace_modify_all_code() */
update |= ftrace_test_record(rec, 1) != FTRACE_UPDATE_IGNORE;
/* Shortcut, if we handled all records, we are done. */
if (!all && count == hash->count)
return;
return update;
} while_for_each_ftrace_rec();
return update;
}
static void ftrace_hash_rec_disable(struct ftrace_ops *ops,
static bool ftrace_hash_rec_disable(struct ftrace_ops *ops,
int filter_hash)
{
__ftrace_hash_rec_update(ops, filter_hash, 0);
return __ftrace_hash_rec_update(ops, filter_hash, 0);
}
static void ftrace_hash_rec_enable(struct ftrace_ops *ops,
static bool ftrace_hash_rec_enable(struct ftrace_ops *ops,
int filter_hash)
{
__ftrace_hash_rec_update(ops, filter_hash, 1);
return __ftrace_hash_rec_update(ops, filter_hash, 1);
}
static void ftrace_hash_rec_update_modify(struct ftrace_ops *ops,
@ -2643,7 +2648,6 @@ static int ftrace_startup(struct ftrace_ops *ops, int command)
return ret;
ftrace_start_up++;
command |= FTRACE_UPDATE_CALLS;
/*
* Note that ftrace probes uses this to start up
@ -2664,7 +2668,8 @@ static int ftrace_startup(struct ftrace_ops *ops, int command)
return ret;
}
ftrace_hash_rec_enable(ops, 1);
if (ftrace_hash_rec_enable(ops, 1))
command |= FTRACE_UPDATE_CALLS;
ftrace_startup_enable(command);
@ -2694,12 +2699,12 @@ static int ftrace_shutdown(struct ftrace_ops *ops, int command)
/* Disabling ipmodify never fails */
ftrace_hash_ipmodify_disable(ops);
ftrace_hash_rec_disable(ops, 1);
if (ftrace_hash_rec_disable(ops, 1))
command |= FTRACE_UPDATE_CALLS;
ops->flags &= ~FTRACE_OPS_FL_ENABLED;
command |= FTRACE_UPDATE_CALLS;
if (saved_ftrace_func != ftrace_trace_function) {
saved_ftrace_func = ftrace_trace_function;
command |= FTRACE_UPDATE_TRACE_FUNC;

36
kernel/trace/trace.c
View File

@ -74,11 +74,6 @@ static struct tracer_opt dummy_tracer_opt[] = {
{ }
};
static struct tracer_flags dummy_tracer_flags = {
.val = 0,
.opts = dummy_tracer_opt
};
static int
dummy_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
{
@ -1258,12 +1253,22 @@ int __init register_tracer(struct tracer *type)
if (!type->set_flag)
type->set_flag = &dummy_set_flag;
if (!type->flags)
type->flags = &dummy_tracer_flags;
else
if (!type->flags) {
/*allocate a dummy tracer_flags*/
type->flags = kmalloc(sizeof(*type->flags), GFP_KERNEL);
if (!type->flags) {
ret = -ENOMEM;
goto out;
}
type->flags->val = 0;
type->flags->opts = dummy_tracer_opt;
} else
if (!type->flags->opts)
type->flags->opts = dummy_tracer_opt;
/* store the tracer for __set_tracer_option */
type->flags->trace = type;
ret = run_tracer_selftest(type);
if (ret < 0)
goto out;
@ -1659,6 +1664,7 @@ tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags,
#else
TRACE_FLAG_IRQS_NOSUPPORT |
#endif
((pc & NMI_MASK ) ? TRACE_FLAG_NMI : 0) |
((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) |
((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) |
(tif_need_resched() ? TRACE_FLAG_NEED_RESCHED : 0) |
@ -3505,7 +3511,7 @@ static int __set_tracer_option(struct trace_array *tr,
struct tracer_flags *tracer_flags,
struct tracer_opt *opts, int neg)
{
struct tracer *trace = tr->current_trace;
struct tracer *trace = tracer_flags->trace;
int ret;
ret = trace->set_flag(tr, tracer_flags->val, opts->bit, !neg);
@ -4949,7 +4955,10 @@ static ssize_t tracing_splice_read_pipe(struct file *filp,
spd.nr_pages = i;
ret = splice_to_pipe(pipe, &spd);
if (i)
ret = splice_to_pipe(pipe, &spd);
else
ret = 0;
out:
splice_shrink_spd(&spd);
return ret;
@ -6391,11 +6400,8 @@ create_trace_option_files(struct trace_array *tr, struct tracer *tracer)
return;
for (i = 0; i < tr->nr_topts; i++) {
/*
* Check if these flags have already been added.
* Some tracers share flags.
*/
if (tr->topts[i].tracer->flags == tracer->flags)
/* Make sure there's no duplicate flags. */
if (WARN_ON_ONCE(tr->topts[i].tracer->flags == tracer->flags))
return;
}

113
kernel/trace/trace.h
View File

@ -125,6 +125,7 @@ enum trace_flag_type {
TRACE_FLAG_HARDIRQ = 0x08,
TRACE_FLAG_SOFTIRQ = 0x10,
TRACE_FLAG_PREEMPT_RESCHED = 0x20,
TRACE_FLAG_NMI = 0x40,
};
#define TRACE_BUF_SIZE 1024
@ -345,6 +346,7 @@ struct tracer_opt {
struct tracer_flags {
u32 val;
struct tracer_opt *opts;
struct tracer *trace;
};
/* Makes more easy to define a tracer opt */
@ -1111,6 +1113,18 @@ struct filter_pred {
unsigned short right;
};
static inline bool is_string_field(struct ftrace_event_field *field)
{
return field->filter_type == FILTER_DYN_STRING ||
field->filter_type == FILTER_STATIC_STRING ||
field->filter_type == FILTER_PTR_STRING;
}
static inline bool is_function_field(struct ftrace_event_field *field)
{
return field->filter_type == FILTER_TRACE_FN;
}
extern enum regex_type
filter_parse_regex(char *buff, int len, char **search, int *not);
extern void print_event_filter(struct trace_event_file *file,
@ -1159,9 +1173,24 @@ struct event_trigger_data {
struct event_filter __rcu *filter;
char *filter_str;
void *private_data;
bool paused;
struct list_head list;
};
extern void trigger_data_free(struct event_trigger_data *data);
extern int event_trigger_init(struct event_trigger_ops *ops,
struct event_trigger_data *data);
extern int trace_event_trigger_enable_disable(struct trace_event_file *file,
int trigger_enable);
extern void update_cond_flag(struct trace_event_file *file);
extern void unregister_trigger(char *glob, struct event_trigger_ops *ops,
struct event_trigger_data *test,
struct trace_event_file *file);
extern int set_trigger_filter(char *filter_str,
struct event_trigger_data *trigger_data,
struct trace_event_file *file);
extern int register_event_command(struct event_command *cmd);
/**
* struct event_trigger_ops - callbacks for trace event triggers
*
@ -1174,7 +1203,8 @@ struct event_trigger_data {
* @func: The trigger 'probe' function called when the triggering
* event occurs. The data passed into this callback is the data
* that was supplied to the event_command @reg() function that
* registered the trigger (see struct event_command).
* registered the trigger (see struct event_command) along with
* the trace record, rec.
*
* @init: An optional initialization function called for the trigger
* when the trigger is registered (via the event_command reg()
@ -1199,7 +1229,8 @@ struct event_trigger_data {
* (see trace_event_triggers.c).
*/
struct event_trigger_ops {
void (*func)(struct event_trigger_data *data);
void (*func)(struct event_trigger_data *data,
void *rec);
int (*init)(struct event_trigger_ops *ops,
struct event_trigger_data *data);
void (*free)(struct event_trigger_ops *ops,
@ -1243,27 +1274,10 @@ struct event_trigger_ops {
* values are defined by adding new values to the trigger_type
* enum in include/linux/trace_events.h.
*
* @post_trigger: A flag that says whether or not this command needs
* to have its action delayed until after the current event has
* been closed. Some triggers need to avoid being invoked while
* an event is currently in the process of being logged, since
* the trigger may itself log data into the trace buffer. Thus
* we make sure the current event is committed before invoking
* those triggers. To do that, the trigger invocation is split
* in two - the first part checks the filter using the current
* trace record; if a command has the @post_trigger flag set, it
* sets a bit for itself in the return value, otherwise it
* directly invokes the trigger. Once all commands have been
* either invoked or set their return flag, the current record is
* either committed or discarded. At that point, if any commands
* have deferred their triggers, those commands are finally
* invoked following the close of the current event. In other
* words, if the event_trigger_ops @func() probe implementation
* itself logs to the trace buffer, this flag should be set,
* otherwise it can be left unspecified.
* @flags: See the enum event_command_flags below.
*
* All the methods below, except for @set_filter(), must be
* implemented.
* All the methods below, except for @set_filter() and @unreg_all(),
* must be implemented.
*
* @func: The callback function responsible for parsing and
* registering the trigger written to the 'trigger' file by the
@ -1288,6 +1302,10 @@ struct event_trigger_ops {
* This is usually implemented by the generic utility function
* @unregister_trigger() (see trace_event_triggers.c).
*
* @unreg_all: An optional function called to remove all the triggers
* from the list of triggers associated with the event. Called
* when a trigger file is opened in truncate mode.
*
* @set_filter: An optional function called to parse and set a filter
* for the trigger. If no @set_filter() method is set for the
* event command, filters set by the user for the command will be
@ -1301,7 +1319,7 @@ struct event_command {
struct list_head list;
char *name;
enum event_trigger_type trigger_type;
bool post_trigger;
int flags;
int (*func)(struct event_command *cmd_ops,
struct trace_event_file *file,
char *glob, char *cmd, char *params);
@ -1313,12 +1331,56 @@ struct event_command {
struct event_trigger_ops *ops,
struct event_trigger_data *data,
struct trace_event_file *file);
void (*unreg_all)(struct trace_event_file *file);
int (*set_filter)(char *filter_str,
struct event_trigger_data *data,
struct trace_event_file *file);
struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param);
};
/**
* enum event_command_flags - flags for struct event_command
*
* @POST_TRIGGER: A flag that says whether or not this command needs
* to have its action delayed until after the current event has
* been closed. Some triggers need to avoid being invoked while
* an event is currently in the process of being logged, since
* the trigger may itself log data into the trace buffer. Thus
* we make sure the current event is committed before invoking
* those triggers. To do that, the trigger invocation is split
* in two - the first part checks the filter using the current
* trace record; if a command has the @post_trigger flag set, it
* sets a bit for itself in the return value, otherwise it
* directly invokes the trigger. Once all commands have been
* either invoked or set their return flag, the current record is
* either committed or discarded. At that point, if any commands
* have deferred their triggers, those commands are finally
* invoked following the close of the current event. In other
* words, if the event_trigger_ops @func() probe implementation
* itself logs to the trace buffer, this flag should be set,
* otherwise it can be left unspecified.
*
* @NEEDS_REC: A flag that says whether or not this command needs
* access to the trace record in order to perform its function,
* regardless of whether or not it has a filter associated with
* it (filters make a trigger require access to the trace record
* but are not always present).
*/
enum event_command_flags {
EVENT_CMD_FL_POST_TRIGGER = 1,
EVENT_CMD_FL_NEEDS_REC = 2,
};
static inline bool event_command_post_trigger(struct event_command *cmd_ops)
{
return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER;
}
static inline bool event_command_needs_rec(struct event_command *cmd_ops)
{
return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC;
}
extern int trace_event_enable_disable(struct trace_event_file *file,
int enable, int soft_disable);
extern int tracing_alloc_snapshot(void);
@ -1365,8 +1427,13 @@ int perf_ftrace_event_register(struct trace_event_call *call,
#ifdef CONFIG_FTRACE_SYSCALLS
void init_ftrace_syscalls(void);
const char *get_syscall_name(int syscall);
#else
static inline void init_ftrace_syscalls(void) { }
static inline const char *get_syscall_name(int syscall)
{
return NULL;
}
#endif
#ifdef CONFIG_EVENT_TRACING

12
kernel/trace/trace_events_filter.c
View File

@ -961,18 +961,6 @@ int filter_assign_type(const char *type)
return FILTER_OTHER;
}
static bool is_function_field(struct ftrace_event_field *field)
{
return field->filter_type == FILTER_TRACE_FN;
}
static bool is_string_field(struct ftrace_event_field *field)
{
return field->filter_type == FILTER_DYN_STRING ||
field->filter_type == FILTER_STATIC_STRING ||
field->filter_type == FILTER_PTR_STRING;
}
static bool is_legal_op(struct ftrace_event_field *field, int op)
{
if (is_string_field(field) &&

88
kernel/trace/trace_events_trigger.c
View File

@ -28,8 +28,7 @@
static LIST_HEAD(trigger_commands);
static DEFINE_MUTEX(trigger_cmd_mutex);
static void
trigger_data_free(struct event_trigger_data *data)
void trigger_data_free(struct event_trigger_data *data)
{
if (data->cmd_ops->set_filter)
data->cmd_ops->set_filter(NULL, data, NULL);
@ -73,18 +72,20 @@ event_triggers_call(struct trace_event_file *file, void *rec)
return tt;
list_for_each_entry_rcu(data, &file->triggers, list) {
if (data->paused)
continue;
if (!rec) {
data->ops->func(data);
data->ops->func(data, rec);
continue;
}
filter = rcu_dereference_sched(data->filter);
if (filter && !filter_match_preds(filter, rec))
continue;
if (data->cmd_ops->post_trigger) {
if (event_command_post_trigger(data->cmd_ops)) {
tt |= data->cmd_ops->trigger_type;
continue;
}
data->ops->func(data);
data->ops->func(data, rec);
}
return tt;
}
@ -94,6 +95,7 @@ EXPORT_SYMBOL_GPL(event_triggers_call);
* event_triggers_post_call - Call 'post_triggers' for a trace event
* @file: The trace_event_file associated with the event
* @tt: enum event_trigger_type containing a set bit for each trigger to invoke
* @rec: The trace entry for the event
*
* For each trigger associated with an event, invoke the trigger
* function registered with the associated trigger command, if the
@ -104,13 +106,16 @@ EXPORT_SYMBOL_GPL(event_triggers_call);
*/
void
event_triggers_post_call(struct trace_event_file *file,
enum event_trigger_type tt)
enum event_trigger_type tt,
void *rec)
{
struct event_trigger_data *data;
list_for_each_entry_rcu(data, &file->triggers, list) {
if (data->paused)
continue;
if (data->cmd_ops->trigger_type & tt)
data->ops->func(data);
data->ops->func(data, rec);
}
}
EXPORT_SYMBOL_GPL(event_triggers_post_call);
@ -188,6 +193,19 @@ static int event_trigger_regex_open(struct inode *inode, struct file *file)
return -ENODEV;
}
if ((file->f_mode & FMODE_WRITE) &&
(file->f_flags & O_TRUNC)) {
struct trace_event_file *event_file;
struct event_command *p;
event_file = event_file_data(file);
list_for_each_entry(p, &trigger_commands, list) {
if (p->unreg_all)
p->unreg_all(event_file);
}
}
if (file->f_mode & FMODE_READ) {
ret = seq_open(file, &event_triggers_seq_ops);
if (!ret) {
@ -306,7 +324,7 @@ const struct file_operations event_trigger_fops = {
* Currently we only register event commands from __init, so mark this
* __init too.
*/
static __init int register_event_command(struct event_command *cmd)
__init int register_event_command(struct event_command *cmd)
{
struct event_command *p;
int ret = 0;
@ -395,9 +413,8 @@ event_trigger_print(const char *name, struct seq_file *m,
*
* Return: 0 on success, errno otherwise
*/
static int
event_trigger_init(struct event_trigger_ops *ops,
struct event_trigger_data *data)
int event_trigger_init(struct event_trigger_ops *ops,
struct event_trigger_data *data)
{
data->ref++;
return 0;
@ -425,8 +442,8 @@ event_trigger_free(struct event_trigger_ops *ops,
trigger_data_free(data);
}
static int trace_event_trigger_enable_disable(struct trace_event_file *file,
int trigger_enable)
int trace_event_trigger_enable_disable(struct trace_event_file *file,
int trigger_enable)
{
int ret = 0;
@ -483,13 +500,14 @@ clear_event_triggers(struct trace_array *tr)
* its TRIGGER_COND bit set, otherwise the TRIGGER_COND bit should be
* cleared.
*/
static void update_cond_flag(struct trace_event_file *file)
void update_cond_flag(struct trace_event_file *file)
{
struct event_trigger_data *data;
bool set_cond = false;
list_for_each_entry_rcu(data, &file->triggers, list) {
if (data->filter || data->cmd_ops->post_trigger) {
if (data->filter || event_command_post_trigger(data->cmd_ops) ||
event_command_needs_rec(data->cmd_ops)) {
set_cond = true;
break;
}
@ -560,9 +578,9 @@ out:
* Usually used directly as the @unreg method in event command
* implementations.
*/
static void unregister_trigger(char *glob, struct event_trigger_ops *ops,
struct event_trigger_data *test,
struct trace_event_file *file)
void unregister_trigger(char *glob, struct event_trigger_ops *ops,
struct event_trigger_data *test,
struct trace_event_file *file)
{
struct event_trigger_data *data;
bool unregistered = false;
@ -696,9 +714,9 @@ event_trigger_callback(struct event_command *cmd_ops,
*
* Return: 0 on success, errno otherwise
*/
static int set_trigger_filter(char *filter_str,
struct event_trigger_data *trigger_data,
struct trace_event_file *file)
int set_trigger_filter(char *filter_str,
struct event_trigger_data *trigger_data,
struct trace_event_file *file)
{
struct event_trigger_data *data = trigger_data;
struct event_filter *filter = NULL, *tmp;
@ -747,7 +765,7 @@ static int set_trigger_filter(char *filter_str,
}
static void
traceon_trigger(struct event_trigger_data *data)
traceon_trigger(struct event_trigger_data *data, void *rec)
{
if (tracing_is_on())
return;
@ -756,7 +774,7 @@ traceon_trigger(struct event_trigger_data *data)
}
static void
traceon_count_trigger(struct event_trigger_data *data)
traceon_count_trigger(struct event_trigger_data *data, void *rec)
{
if (tracing_is_on())
return;
@ -771,7 +789,7 @@ traceon_count_trigger(struct event_trigger_data *data)
}
static void
traceoff_trigger(struct event_trigger_data *data)
traceoff_trigger(struct event_trigger_data *data, void *rec)
{
if (!tracing_is_on())
return;
@ -780,7 +798,7 @@ traceoff_trigger(struct event_trigger_data *data)
}
static void
traceoff_count_trigger(struct event_trigger_data *data)
traceoff_count_trigger(struct event_trigger_data *data, void *rec)
{
if (!tracing_is_on())
return;
@ -876,13 +894,13 @@ static struct event_command trigger_traceoff_cmd = {
#ifdef CONFIG_TRACER_SNAPSHOT
static void
snapshot_trigger(struct event_trigger_data *data)
snapshot_trigger(struct event_trigger_data *data, void *rec)
{
tracing_snapshot();
}
static void
snapshot_count_trigger(struct event_trigger_data *data)
snapshot_count_trigger(struct event_trigger_data *data, void *rec)
{
if (!data->count)
return;
@ -890,7 +908,7 @@ snapshot_count_trigger(struct event_trigger_data *data)
if (data->count != -1)
(data->count)--;
snapshot_trigger(data);
snapshot_trigger(data, rec);
}
static int
@ -969,13 +987,13 @@ static __init int register_trigger_snapshot_cmd(void) { return 0; }
#define STACK_SKIP 3
static void
stacktrace_trigger(struct event_trigger_data *data)
stacktrace_trigger(struct event_trigger_data *data, void *rec)
{
trace_dump_stack(STACK_SKIP);
}
static void
stacktrace_count_trigger(struct event_trigger_data *data)
stacktrace_count_trigger(struct event_trigger_data *data, void *rec)
{
if (!data->count)
return;
@ -983,7 +1001,7 @@ stacktrace_count_trigger(struct event_trigger_data *data)
if (data->count != -1)
(data->count)--;
stacktrace_trigger(data);
stacktrace_trigger(data, rec);
}
static int
@ -1017,7 +1035,7 @@ stacktrace_get_trigger_ops(char *cmd, char *param)
static struct event_command trigger_stacktrace_cmd = {
.name = "stacktrace",
.trigger_type = ETT_STACKTRACE,
.post_trigger = true,
.flags = EVENT_CMD_FL_POST_TRIGGER,
.func = event_trigger_callback,
.reg = register_trigger,
.unreg = unregister_trigger,
@ -1054,7 +1072,7 @@ struct enable_trigger_data {
};
static void
event_enable_trigger(struct event_trigger_data *data)
event_enable_trigger(struct event_trigger_data *data, void *rec)
{
struct enable_trigger_data *enable_data = data->private_data;
@ -1065,7 +1083,7 @@ event_enable_trigger(struct event_trigger_data *data)
}
static void
event_enable_count_trigger(struct event_trigger_data *data)
event_enable_count_trigger(struct event_trigger_data *data, void *rec)
{
struct enable_trigger_data *enable_data = data->private_data;
@ -1079,7 +1097,7 @@ event_enable_count_trigger(struct event_trigger_data *data)
if (data->count != -1)
(data->count)--;
event_enable_trigger(data);
event_enable_trigger(data, rec);
}
static int

6
kernel/trace/trace_functions.c
View File

@ -219,6 +219,8 @@ static void tracing_stop_function_trace(struct trace_array *tr)
unregister_ftrace_function(tr->ops);
}
static struct tracer function_trace;
static int
func_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
{
@ -228,6 +230,10 @@ func_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
if (!!set == !!(func_flags.val & TRACE_FUNC_OPT_STACK))
break;
/* We can change this flag when not running. */
if (tr->current_trace != &function_trace)
break;
unregister_ftrace_function(tr->ops);
if (set) {

9
kernel/trace/trace_irqsoff.c
View File

@ -109,8 +109,12 @@ static int func_prolog_dec(struct trace_array *tr,
return 0;
local_save_flags(*flags);
/* slight chance to get a false positive on tracing_cpu */
if (!irqs_disabled_flags(*flags))
/*
* Slight chance to get a false positive on tracing_cpu,
* although I'm starting to think there isn't a chance.
* Leave this for now just to be paranoid.
*/
if (!irqs_disabled_flags(*flags) && !preempt_count())
return 0;
*data = per_cpu_ptr(tr->trace_buffer.data, cpu);
@ -622,7 +626,6 @@ static int __irqsoff_tracer_init(struct trace_array *tr)
irqsoff_trace = tr;
/* make sure that the tracer is visible */
smp_wmb();
tracing_reset_online_cpus(&tr->trace_buffer);
ftrace_init_array_ops(tr, irqsoff_tracer_call);

4
kernel/trace/trace_nop.c
View File

@ -56,7 +56,7 @@ static void nop_trace_reset(struct trace_array *tr)
}
/* It only serves as a signal handler and a callback to
* accept or refuse tthe setting of a flag.
* accept or refuse the setting of a flag.
* If you don't implement it, then the flag setting will be
* automatically accepted.
*/
@ -75,7 +75,7 @@ static int nop_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
if (bit == TRACE_NOP_OPT_REFUSE) {
printk(KERN_DEBUG "nop_test_refuse flag set to %d: we refuse."
"Now cat trace_options to see the result\n",
" Now cat trace_options to see the result\n",
set);
return -EINVAL;
}

10
kernel/trace/trace_output.c
View File

@ -389,7 +389,9 @@ int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
char irqs_off;
int hardirq;
int softirq;
int nmi;
nmi = entry->flags & TRACE_FLAG_NMI;
hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
@ -415,10 +417,12 @@ int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
}
hardsoft_irq =
(nmi && hardirq) ? 'Z' :
nmi ? 'z' :
(hardirq && softirq) ? 'H' :
hardirq ? 'h' :
softirq ? 's' :
'.';
hardirq ? 'h' :
softirq ? 's' :
'.' ;
trace_seq_printf(s, "%c%c%c",
irqs_off, need_resched, hardsoft_irq);

3
kernel/trace/trace_printk.c
View File

@ -296,6 +296,9 @@ static int t_show(struct seq_file *m, void *v)
const char *str = *fmt;
int i;
if (!*fmt)
return 0;
seq_printf(m, "0x%lx : \"", *(unsigned long *)fmt);
/*

11
kernel/trace/trace_syscalls.c
View File

@ -106,6 +106,17 @@ static struct syscall_metadata *syscall_nr_to_meta(int nr)
return syscalls_metadata[nr];
}
const char *get_syscall_name(int syscall)
{
struct syscall_metadata *entry;
entry = syscall_nr_to_meta(syscall);
if (!entry)
return NULL;
return entry->name;
}
static enum print_line_t
print_syscall_enter(struct trace_iterator *iter, int flags,
struct trace_event *event)