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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 5 May 2016 02:46:28 -0700
From:	tip-bot for Alexander Shishkin <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com,
	mathieu.poirier@...aro.org, tglx@...utronix.de, mingo@...nel.org,
	peterz@...radead.org, alexander.shishkin@...ux.intel.com,
	eranian@...gle.com, bp@...en8.de, acme@...radead.org,
	vincent.weaver@...ne.edu, hpa@...or.com, jolsa@...hat.com,
	torvalds@...ux-foundation.org
Subject: [tip:perf/core] perf/core: Extend perf_event_aux_ctx() to
 optionally iterate through more events

Commit-ID:  b73e4fefc18adbe4d12ffb746fb16306674c1ac6
Gitweb:     http://git.kernel.org/tip/b73e4fefc18adbe4d12ffb746fb16306674c1ac6
Author:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>
AuthorDate: Wed, 27 Apr 2016 18:44:45 +0300
Committer:  Ingo Molnar <mingo@...nel.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@...ux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Arnaldo Carvalho de Melo <acme@...radead.org>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Vince Weaver <vincent.weaver@...ne.edu>
Cc: vince@...ter.net
Link: http://lkml.kernel.org/r/1461771888-10409-5-git-send-email-alexander.shishkin@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@...nel.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;