linux-kernel - [tip:perf/core] trace: Reorder struct ring_buffer_per

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Date:	Fri, 23 Jul 2010 12:10:03 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,
	rostedt@...dmis.org, richard@....demon.co.uk, tglx@...utronix.de
Subject: [tip:perf/core] trace: Reorder struct ring_buffer_per_cpu to remove padding on 64bit

Commit-ID:  985023dee6e212493831431ba2e3ce8918f001b2
Gitweb:     http://git.kernel.org/tip/985023dee6e212493831431ba2e3ce8918f001b2
Author:     Richard Kennedy <richard@....demon.co.uk>
AuthorDate: Thu, 25 Mar 2010 11:27:36 +0000
Committer:  Steven Rostedt <rostedt@...dmis.org>
CommitDate: Tue, 20 Jul 2010 21:58:44 -0400

trace: Reorder struct ring_buffer_per_cpu to remove padding on 64bit

Reorder structure to remove 8 bytes of padding on 64 bit builds.
This shrinks the size to 128 bytes so allowing allocation from a smaller
slab & needed one fewer cache lines.

Signed-off-by: Richard Kennedy <richard@....demon.co.uk>
LKML-Reference: <1269516456.2054.8.camel@...alhost>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
---
 kernel/trace/ring_buffer.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 28d0615..3632ce8 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -443,6 +443,7 @@ int ring_buffer_print_page_header(struct trace_seq *s)
  */
 struct ring_buffer_per_cpu {
 	int				cpu;
+	atomic_t			record_disabled;
 	struct ring_buffer		*buffer;
 	spinlock_t			reader_lock;	/* serialize readers */
 	arch_spinlock_t			lock;
@@ -462,7 +463,6 @@ struct ring_buffer_per_cpu {
 	unsigned long			read;
 	u64				write_stamp;
 	u64				read_stamp;
-	atomic_t			record_disabled;
 };
 
 struct ring_buffer {
--
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