From: Richard Kennedy <richard@rsk.demon.co.uk>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>, Ingo Molnar <mingo@elte.hu>,
lkml <linux-kernel@vger.kernel.org>
Subject: [PATCH] perf events: remove 64bit alignment padding from perf_event_context
Date: Tue, 07 Jun 2011 16:33:38 +0100 [thread overview]
Message-ID: <1307460819.1950.5.camel@castor.rsk> (raw)
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@rsk.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;
};
/*
next reply other threads:[~2011-06-07 15:33 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-07 15:33 Richard Kennedy [this message]
2011-06-07 15:39 ` Peter Zijlstra
2011-07-01 15:19 ` [tip:perf/core] perf: Remove 64-bit " tip-bot for Richard Kennedy
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