linux-kernel - [PATCH] perf events: remove 64bit alignment padding from perf_event

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Message-ID: <1307460819.1950.5.camel@castor.rsk>
Date:	Tue, 07 Jun 2011 16:33:38 +0100
From:	Richard Kennedy <richard@....demon.co.uk>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	lkml <linux-kernel@...r.kernel.org>
Subject: [PATCH] perf events: remove 64bit alignment padding from
 perf_event_context

Reorder perf_event_context to remove 8 bytes of 64 bit alignment padding
shrinking its size to 192 bytes, allowing it to fit into a smaller slab
and use one fewer cache lines.


Signed-off-by: Richard Kennedy <richard@....demon.co.uk>

---

patch against v3.0-rc2
compiled & tested on x86_64

regards
Richard


diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 3412684..9d5b3d5 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -919,8 +919,8 @@ struct perf_event_context {
 	u64				parent_gen;
 	u64				generation;
 	int				pin_count;
-	struct rcu_head			rcu_head;
 	int				nr_cgroups; /* cgroup events present */
+	struct rcu_head			rcu_head;
 };
 
 /*


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