linux-kernel - [tip:perf/core] perf: Simplify perf_event_exit_task

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Message-ID: <tip-tij931199thfkys8vbnokdpf@git.kernel.org>
Date:	Thu, 8 May 2014 03:45:33 -0700
From:	tip-bot for Peter Zijlstra <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, eranian@...gle.com, paulus@...ba.org,
	hpa@...or.com, mingo@...nel.org, torvalds@...ux-foundation.org,
	peterz@...radead.org, acme@...nel.org, vincent.weaver@...ne.edu,
	tglx@...utronix.de
Subject: [tip:perf/core] perf: Simplify perf_event_exit_task_context()

Commit-ID:  3a497f48637e2aac17eabb84a17f8ac5216028fc
Gitweb:     http://git.kernel.org/tip/3a497f48637e2aac17eabb84a17f8ac5216028fc
Author:     Peter Zijlstra <peterz@...radead.org>
AuthorDate: Mon, 5 May 2014 12:42:29 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 7 May 2014 13:44:19 +0200

perf: Simplify perf_event_exit_task_context()

Instead of jumping through hoops to make sure to find (and exit) each
event, do it the simple straight fwd way.

Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Vince Weaver <vincent.weaver@...ne.edu>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/n/tip-tij931199thfkys8vbnokdpf@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/events/core.c | 17 +----------------
 1 file changed, 1 insertion(+), 16 deletions(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 83505a3..7ab734f 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -7485,24 +7485,9 @@ static void perf_event_exit_task_context(struct task_struct *child, int ctxn)
 	 */
 	mutex_lock(&child_ctx->mutex);
 
-again:
-	list_for_each_entry_safe(child_event, tmp, &child_ctx->pinned_groups,
-				 group_entry)
-		__perf_event_exit_task(child_event, child_ctx, child);
-
-	list_for_each_entry_safe(child_event, tmp, &child_ctx->flexible_groups,
-				 group_entry)
+	list_for_each_entry_rcu(child_event, &child_ctx->event_list, event_entry)
 		__perf_event_exit_task(child_event, child_ctx, child);
 
-	/*
-	 * If the last event was a group event, it will have appended all
-	 * its siblings to the list, but we obtained 'tmp' before that which
-	 * will still point to the list head terminating the iteration.
-	 */
-	if (!list_empty(&child_ctx->pinned_groups) ||
-	    !list_empty(&child_ctx->flexible_groups))
-		goto again;
-
 	mutex_unlock(&child_ctx->mutex);
 
 	put_ctx(child_ctx);
--
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