linux-kernel - [PATCH 8/8] taskstats: avoid breaking binary compatibility between taskstats v6 and before

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Message-ID: <20070926170854.31221.57986.stgit@cheypa.inria.fr>
Date:	Wed, 26 Sep 2007 19:08:54 +0200
From:	Guillaume Chazarain <guichaz@...oo.fr>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:	Guillaume Chazarain <guichaz@...oo.fr>,
	Michael Neuling <mikey@...ling.org>,
	Balbir Singh <balbir@...ibm.com>, Jay Lan <jlan@...r.sgi.com>,
	Jonathan Lim <jlim@....com>, Oleg Nesterov <oleg@...sign.ru>
Subject: [PATCH 8/8] taskstats: avoid breaking binary compatibility between
	taskstats v6 and before

Place fields added in v6 at the end of the struct.

Signed-off-by: Guillaume Chazarain <guichaz@...oo.fr>
Cc: Michael Neuling <mikey@...ling.org>
Cc: Balbir Singh <balbir@...ibm.com>
Cc: Jay Lan <jlan@...r.sgi.com>
Cc: Jonathan Lim <jlim@....com>
Cc: Oleg Nesterov <oleg@...sign.ru>
---

 include/linux/taskstats.h |   18 +++++++++++-------
 1 files changed, 11 insertions(+), 7 deletions(-)


diff --git a/include/linux/taskstats.h b/include/linux/taskstats.h
index 92bfd1c..dc6850c 100644
--- a/include/linux/taskstats.h
+++ b/include/linux/taskstats.h
@@ -85,12 +85,9 @@ struct taskstats {
 	 * On some architectures, value will adjust for cpu time stolen
 	 * from the kernel in involuntary waits due to virtualization.
 	 * Value is cumulative, in nanoseconds, without a corresponding count
-	 * and wraps around to zero silently on overflow.  The
-	 * _scaled_ version accounts for cpus which can scale the
-	 * number of instructions executed each cycle.
+	 * and wraps around to zero silently on overflow.
 	 */
 	__u64	cpu_run_real_total;
-	__u64	cpu_scaled_run_real_total;
 
 	/* cpu "virtual" running time
 	 * Uses time intervals seen by the kernel i.e. no adjustment
@@ -146,9 +143,6 @@ struct taskstats {
 	__u64	read_syscalls;		/* read syscalls */
 	__u64	write_syscalls;		/* write syscalls */
 
-	/* time accounting for SMT machines */
-	__u64	ac_utimescaled;		/* utime scaled on frequency etc */
-	__u64	ac_stimescaled;		/* stime scaled on frequency etc */
 	/* Extended accounting fields end */
 
 #define TASKSTATS_HAS_IO_ACCOUNTING
@@ -159,6 +153,16 @@ struct taskstats {
 
 	__u64  nvcsw;			/* voluntary_ctxt_switches */
 	__u64  nivcsw;			/* nonvoluntary_ctxt_switches */
+
+	/*
+	 * Same as cpu_run_real_total but accounts for cpus which can scale the
+	 * number of instructions executed each cycle.
+	 */
+	__u64	cpu_scaled_run_real_total;
+
+	/* time accounting for SMT machines */
+	__u64	ac_utimescaled;		/* utime scaled on frequency etc */
+	__u64	ac_stimescaled;		/* stime scaled on frequency etc */
 };
 
 
-
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