linux-kernel - [tip:perf/urgent] perf: Reorder & optimize perf_event_context to remove alignment padding on 64 bit builds

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Message-ID: <tip-ee643c4179c3a18b018de3a4c07a7bb3a75c8e4e@git.kernel.org>
Date:	Wed, 16 Mar 2011 13:59:17 GMT
From:	tip-bot for Richard Kennedy <richard@....demon.co.uk>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, richard@....demon.co.uk,
	tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perf/urgent] perf: Reorder & optimize perf_event_context to remove alignment padding on 64 bit builds

Commit-ID:  ee643c4179c3a18b018de3a4c07a7bb3a75c8e4e
Gitweb:     http://git.kernel.org/tip/ee643c4179c3a18b018de3a4c07a7bb3a75c8e4e
Author:     Richard Kennedy <richard@....demon.co.uk>
AuthorDate: Mon, 7 Mar 2011 15:46:59 +0000
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 16 Mar 2011 14:04:14 +0100

perf: Reorder & optimize perf_event_context to remove alignment padding on 64 bit builds

Remove 8 bytes of alignment padding from perf_event_context on 64 bit
builds which shrinks its size to 192 bytes allowing it to fit into one
fewer cache lines and into a smaller slab.

Signed-off-by: Richard Kennedy <richard@....demon.co.uk>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
LKML-Reference: <1299512819.2039.5.camel@...tor.rsk>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 include/linux/perf_event.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 614615b..f495c01 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -878,8 +878,8 @@ enum perf_event_context_type {
  * Used as a container for task events and CPU events as well:
  */
 struct perf_event_context {
-	enum perf_event_context_type	type;
 	struct pmu			*pmu;
+	enum perf_event_context_type	type;
 	/*
 	 * Protect the states of the events in the list,
 	 * nr_active, and the list:
--
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