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perf: Add non-exec mmap() tracking

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Add the capacility to track data mmap()s. This can be used together
with PERF_SAMPLE_ADDR for data profiling.

Signed-off-by: Anton Blanchard <anton@samba.org>
[Updated code for stable perf ABI]
Signed-off-by: Eric B Munson <ebmunson@us.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <1274193049-25997-1-git-send-email-ebmunson@us.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Eric B Munson
2010-05-18 15:30:49 +01:00
committed by Ingo Molnar
parent 8ed92280be
commit 3af9e85928
5 changed files with 35 additions and 22 deletions
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34
kernel/perf_event.c
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@ -1891,7 +1891,7 @@ static void free_event(struct perf_event *event)
if (!event->parent) {
atomic_dec(&nr_events);
if (event->attr.mmap)
if (event->attr.mmap || event->attr.mmap_data)
atomic_dec(&nr_mmap_events);
if (event->attr.comm)
atomic_dec(&nr_comm_events);
@ -3491,7 +3491,7 @@ perf_event_read_event(struct perf_event *event,
/*
* task tracking -- fork/exit
*
* enabled by: attr.comm | attr.mmap | attr.task
* enabled by: attr.comm | attr.mmap | attr.mmap_data | attr.task
*/
struct perf_task_event {
@ -3541,7 +3541,8 @@ static int perf_event_task_match(struct perf_event *event)
if (event->cpu != -1 && event->cpu != smp_processor_id())
return 0;
if (event->attr.comm || event->attr.mmap || event->attr.task)
if (event->attr.comm || event->attr.mmap ||
event->attr.mmap_data || event->attr.task)
return 1;
return 0;
@ -3766,7 +3767,8 @@ static void perf_event_mmap_output(struct perf_event *event,
}
static int perf_event_mmap_match(struct perf_event *event,
struct perf_mmap_event *mmap_event)
struct perf_mmap_event *mmap_event,
int executable)
{
if (event->state < PERF_EVENT_STATE_INACTIVE)
return 0;
@ -3774,19 +3776,21 @@ static int perf_event_mmap_match(struct perf_event *event,
if (event->cpu != -1 && event->cpu != smp_processor_id())
return 0;
if (event->attr.mmap)
if ((!executable && event->attr.mmap_data) ||
(executable && event->attr.mmap))
return 1;
return 0;
}
static void perf_event_mmap_ctx(struct perf_event_context *ctx,
struct perf_mmap_event *mmap_event)
struct perf_mmap_event *mmap_event,
int executable)
{
struct perf_event *event;
list_for_each_entry_rcu(event, &ctx->event_list, event_entry) {
if (perf_event_mmap_match(event, mmap_event))
if (perf_event_mmap_match(event, mmap_event, executable))
perf_event_mmap_output(event, mmap_event);
}
}
@ -3830,6 +3834,14 @@ static void perf_event_mmap_event(struct perf_mmap_event *mmap_event)
if (!vma->vm_mm) {
name = strncpy(tmp, "[vdso]", sizeof(tmp));
goto got_name;
} else if (vma->vm_start <= vma->vm_mm->start_brk &&
vma->vm_end >= vma->vm_mm->brk) {
name = strncpy(tmp, "[heap]", sizeof(tmp));
goto got_name;
} else if (vma->vm_start <= vma->vm_mm->start_stack &&
vma->vm_end >= vma->vm_mm->start_stack) {
name = strncpy(tmp, "[stack]", sizeof(tmp));
goto got_name;
}
name = strncpy(tmp, "//anon", sizeof(tmp));
@ -3846,17 +3858,17 @@ got_name:
rcu_read_lock();
cpuctx = &get_cpu_var(perf_cpu_context);
perf_event_mmap_ctx(&cpuctx->ctx, mmap_event);
perf_event_mmap_ctx(&cpuctx->ctx, mmap_event, vma->vm_flags & VM_EXEC);
ctx = rcu_dereference(current->perf_event_ctxp);
if (ctx)
perf_event_mmap_ctx(ctx, mmap_event);
perf_event_mmap_ctx(ctx, mmap_event, vma->vm_flags & VM_EXEC);
put_cpu_var(perf_cpu_context);
rcu_read_unlock();
kfree(buf);
}
void __perf_event_mmap(struct vm_area_struct *vma)
void perf_event_mmap(struct vm_area_struct *vma)
{
struct perf_mmap_event mmap_event;
@ -4911,7 +4923,7 @@ done:
if (!event->parent) {
atomic_inc(&nr_events);
if (event->attr.mmap)
if (event->attr.mmap || event->attr.mmap_data)
atomic_inc(&nr_mmap_events);
if (event->attr.comm)
atomic_inc(&nr_comm_events);