linux-kernel - [tip:perf/urgent] perf/core: Simplify perf_event_free

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Date:   Thu, 16 Mar 2017 08:20:29 -0700
From:   tip-bot for Peter Zijlstra <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, mathieu.desnoyers@...icios.com,
        oleg@...hat.com, acme@...hat.com, torvalds@...ux-foundation.org,
        peterz@...radead.org, vincent.weaver@...ne.edu, acme@...nel.org,
        mingo@...nel.org, jolsa@...hat.com, hpa@...or.com,
        linux-kernel@...r.kernel.org, dvyukov@...gle.com,
        alexander.shishkin@...ux.intel.com, eranian@...gle.com
Subject: [tip:perf/urgent] perf/core: Simplify perf_event_free_task()

Commit-ID:  15121c789e001168decac6483d192bdb7ea29e74
Gitweb:     http://git.kernel.org/tip/15121c789e001168decac6483d192bdb7ea29e74
Author:     Peter Zijlstra <peterz@...radead.org>
AuthorDate: Thu, 16 Mar 2017 13:47:50 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 16 Mar 2017 14:16:53 +0100

perf/core: Simplify perf_event_free_task()

We have ctx->event_list that contains all events; no need to
repeatedly iterate the group lists to find them all.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Dmitry Vyukov <dvyukov@...gle.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: Oleg Nesterov <oleg@...hat.com>
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: fweisbec@...il.com
Link: http://lkml.kernel.org/r/20170316125823.239678244@infradead.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/events/core.c | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index fc7c9a8..5f21e5e 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -10426,21 +10426,11 @@ void perf_event_free_task(struct task_struct *task)
 		WRITE_ONCE(ctx->task, TASK_TOMBSTONE);
 		put_task_struct(task); /* cannot be last */
 		raw_spin_unlock_irq(&ctx->lock);
-again:
-		list_for_each_entry_safe(event, tmp, &ctx->pinned_groups,
-				group_entry)
-			perf_free_event(event, ctx);
 
-		list_for_each_entry_safe(event, tmp, &ctx->flexible_groups,
-				group_entry)
+		list_for_each_entry_safe(event, tmp, &ctx->event_list, event_entry)
 			perf_free_event(event, ctx);
 
-		if (!list_empty(&ctx->pinned_groups) ||
-				!list_empty(&ctx->flexible_groups))
-			goto again;
-
 		mutex_unlock(&ctx->mutex);
-
 		put_ctx(ctx);
 	}
 }