linux-kernel - Re: [PATCH -tip] cpuacct: per-cgroup utime/stime statistics

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Date:	Mon, 23 Mar 2009 13:55:28 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	bharata@...ux.vnet.ibm.com
Cc:	linux-kernel@...r.kernel.org, Balaji Rao <balajirrao@...il.com>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Paul Menage <menage@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH -tip] cpuacct: per-cgroup utime/stime statistics - v4

On Mon, 23 Mar 2009 10:05:38 +0530
Bharata B Rao <bharata@...ux.vnet.ibm.com> wrote:

> Hi Ingo,
> 
> Here is the v4 of the cpuacct statistics patch to obtain per-cgroup
> system and user times  with appropriate tags and complete changelog.
> This applies against the latest -tip plus the cpuacct hierarchy fix v2
> which I posted just now. Could you please include this in -tip ?
> 
> Changelog:
> 
> v4
> - Remove comments in cpuacct_update_stats() which explained why rcu_read_lock()
>   was needed (as per Peter Zijlstra's review comments).
> - Don't say that percpu_counter_read() is broken in Documentation/cpuacct.txt
>   as per KAMEZAWA Hiroyuki's review comments.
> 
Broken -> isn't safe ? no difference ;)
Can't this help you ?


Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
---
Index: mmotm-2.6.29-Mar21/include/linux/percpu_counter.h
===================================================================
--- mmotm-2.6.29-Mar21.orig/include/linux/percpu_counter.h
+++ mmotm-2.6.29-Mar21/include/linux/percpu_counter.h
@@ -62,6 +62,16 @@ static inline s64 percpu_counter_read(st
 	return fbc->count;
 }
 
+static inline s64 percpu_counter_read_safe(struct percpu_counter *fbc)
+{
+	s64 ret;
+
+	spin_lock(&fbc->lock);
+	ret = fbc->count;
+	spin_unlock(&fbc->lock);
+	return ret;
+}
+
 /*
  * It is possible for the percpu_counter_read() to return a small negative
  * number for some counter which should never be negative.
@@ -114,6 +124,11 @@ static inline s64 percpu_counter_read(st
 	return fbc->count;
 }
 
+static inline s64 percpu_counter_read_safe(struct percpu_counter *fbc)
+{
+	return fbc->count;
+}
+
 static inline s64 percpu_counter_read_positive(struct percpu_counter *fbc)
 {
 	return fbc->count;

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