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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>
This commit is contained in:
Alexander Shishkin 2016-04-27 18:44:45 +03:00 committed by Ingo Molnar
parent f127fa098d
commit b73e4fefc1
1 changed files with 13 additions and 10 deletions
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23
kernel/events/core.c
View File

@ -5781,15 +5781,18 @@ typedef void (perf_event_aux_output_cb)(struct perf_event *event, void *data);
static void static void
perf_event_aux_ctx(struct perf_event_context *ctx, perf_event_aux_ctx(struct perf_event_context *ctx,
perf_event_aux_output_cb output, perf_event_aux_output_cb output,
void *data) void *data, bool all)
{ {
struct perf_event *event; struct perf_event *event;
list_for_each_entry_rcu(event, &ctx->event_list, event_entry) { list_for_each_entry_rcu(event, &ctx->event_list, event_entry) {
if (event->state < PERF_EVENT_STATE_INACTIVE) if (!all) {
continue; if (event->state < PERF_EVENT_STATE_INACTIVE)
if (!event_filter_match(event)) continue;
continue; if (!event_filter_match(event))
continue;
}
output(event, data); output(event, data);
} }
} }
@ -5800,7 +5803,7 @@ perf_event_aux_task_ctx(perf_event_aux_output_cb output, void *data,
{ {
rcu_read_lock(); rcu_read_lock();
preempt_disable(); preempt_disable();
perf_event_aux_ctx(task_ctx, output, data); perf_event_aux_ctx(task_ctx, output, data, false);
preempt_enable(); preempt_enable();
rcu_read_unlock(); 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); cpuctx = get_cpu_ptr(pmu->pmu_cpu_context);
if (cpuctx->unique_pmu != pmu) if (cpuctx->unique_pmu != pmu)
goto next; goto next;
perf_event_aux_ctx(&cpuctx->ctx, output, data); perf_event_aux_ctx(&cpuctx->ctx, output, data, false);
ctxn = pmu->task_ctx_nr; ctxn = pmu->task_ctx_nr;
if (ctxn < 0) if (ctxn < 0)
goto next; goto next;
ctx = rcu_dereference(current->perf_event_ctxp[ctxn]); ctx = rcu_dereference(current->perf_event_ctxp[ctxn]);
if (ctx) if (ctx)
perf_event_aux_ctx(ctx, output, data); perf_event_aux_ctx(ctx, output, data, false);
next: next:
put_cpu_ptr(pmu->pmu_cpu_context); put_cpu_ptr(pmu->pmu_cpu_context);
} }
@ -5878,10 +5881,10 @@ static int __perf_pmu_output_stop(void *info)
}; };
rcu_read_lock(); 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) if (cpuctx->task_ctx)
perf_event_aux_ctx(cpuctx->task_ctx, __perf_event_output_stop, perf_event_aux_ctx(cpuctx->task_ctx, __perf_event_output_stop,
&ro); &ro, false);
rcu_read_unlock(); rcu_read_unlock();
return ro.err; return ro.err;