[tip:perf/core] perf/core: Extend perf_event_aux_ctx() to optionally iterate through more events

tip-bot for Alexander Shishkin
2016-05-05T09:47:49Z

Commit-ID: b73e4fefc18adbe4d12ffb746fb16306674c1ac6
Gitweb: http://git.kernel.org/tip/b73e4fefc18adbe4d12ffb746fb16306674c1ac6
Author: Alexander Shishkin <alexander.shishkin@linux.intel.com>
AuthorDate: Wed, 27 Apr 2016 18:44:45 +0300
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Thu, 5 May 2016 10:13:57 +0200

perf/core: Extend perf_event_aux_ctx() to optionally iterate through more events

Trace filtering code needs an iterator that can go through all events in
a context, including inactive and filtered, to be able to update their
filters' address ranges based on mmap or exec events.

This patch changes perf_event_aux_ctx() to optionally do this.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: vince@deater.net
Link: http://lkml.kernel.org/r/1461771888-10409-5-git-send-email-alexander.shishkin@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
kernel/events/core.c | 23 +++++++++++++----------
1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 13956ee..2bb7c47 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -5781,15 +5781,18 @@ typedef void (perf_event_aux_output_cb)(struct perf_event *event, void *data);
static void
perf_event_aux_ctx(struct perf_event_context *ctx,
perf_event_aux_output_cb output,
- void *data)
+ void *data, bool all)
{
struct perf_event *event;

list_for_each_entry_rcu(event, &ctx->event_list, event_entry) {
- if (event->state < PERF_EVENT_STATE_INACTIVE)
- continue;
- if (!event_filter_match(event))
- continue;
+ if (!all) {
+ if (event->state < PERF_EVENT_STATE_INACTIVE)
+ continue;
+ if (!event_filter_match(event))
+ continue;
+ }
+
output(event, data);
}
}
@@ -5800,7 +5803,7 @@ perf_event_aux_task_ctx(perf_event_aux_output_cb output, void *data,
{
rcu_read_lock();
preempt_disable();
- perf_event_aux_ctx(task_ctx, output, data);
+ perf_event_aux_ctx(task_ctx, output, data, false);
preempt_enable();
rcu_read_unlock();
}
@@ -5830,13 +5833,13 @@ perf_event_aux(perf_event_aux_output_cb output, void *data,
cpuctx = get_cpu_ptr(pmu->pmu_cpu_context);
if (cpuctx->unique_pmu != pmu)
goto next;
- perf_event_aux_ctx(&cpuctx->ctx, output, data);
+ perf_event_aux_ctx(&cpuctx->ctx, output, data, false);
ctxn = pmu->task_ctx_nr;
if (ctxn < 0)
goto next;
ctx = rcu_dereference(current->perf_event_ctxp[ctxn]);
if (ctx)
- perf_event_aux_ctx(ctx, output, data);
+ perf_event_aux_ctx(ctx, output, data, false);
next:
put_cpu_ptr(pmu->pmu_cpu_context);
}
@@ -5878,10 +5881,10 @@ static int __perf_pmu_output_stop(void *info)
};

rcu_read_lock();
- perf_event_aux_ctx(&cpuctx->ctx, __perf_event_output_stop, &ro);
+ perf_event_aux_ctx(&cpuctx->ctx, __perf_event_output_stop, &ro, false);
if (cpuctx->task_ctx)
perf_event_aux_ctx(cpuctx->task_ctx, __perf_event_output_stop,
- &ro);
+ &ro, false);
rcu_read_unlock();

return ro.err;