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

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Date:	Mon, 30 Mar 2009 14:50:02 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Bharata B Rao <bharata@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, Balaji Rao <balajirrao@...il.com>,
	Dhaval Giani <dhaval@...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>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH -tip] cpuacct: per-cgroup utime/stime statistics - v6

* Bharata B Rao <bharata@...ux.vnet.ibm.com> [2009-03-25 10:09:50]:

> Here is the next version which fixes the bug pointed by Li Zefan in v5.
> 
> We currently have two stats named stime and utime. In future if we
> decide to have more fine grained stats like time spent in irq, softirq
> etc, it will be difficult to name them similar to stime and utime. Hence
> would it make sense to name these stats as system and user so that we
> could easily add nice, irq, steal, softirq etc in future ?
> 
> Regards,
> Bharata.
> 
> cpuacct: Add stime and utime statistics
> 
> Add per-cgroup cpuacct controller statistics like the system and user
> time consumed by the group of tasks.
> 
> Changelog:
> 
> v6
> - Fixed a bug in the error path of cpuacct_create() (pointed by Li Zefan).
> 
> v5
> - In cpuacct_stats_show(), use cputime64_to_clock_t() since we are
>   operating on a 64bit variable here.
> 
> 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.
> 
> v3
> - Fix a small race in the cpuacct hierarchy walk.
> 
> v2
> - stime and utime now exported in clock_t units instead of msecs.
> - Addressed the code review comments from Balbir and Li Zefan.
> - Moved to -tip tree.
> 
> v1
> - Moved the stime/utime accounting to cpuacct controller.
> 
> Earlier versions
> - http://lkml.org/lkml/2009/2/25/129
> 
> Signed-off-by: Bharata B Rao <bharata@...ux.vnet.ibm.com>
> Signed-off-by: Balaji Rao <balajirrao@...il.com>
> Cc: Dhaval Giani <dhaval@...ux.vnet.ibm.com>
> Cc: Paul Menage <menage@...gle.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> Reviewed-by: Li Zefan <lizf@...fujitsu.com>
> Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Acked-by: Balbir Singh <balbir@...ux.vnet.ibm.com>
> Tested-by: Balbir Singh <balbir@...ux.vnet.ibm.com>
> ---
>  Documentation/cgroups/cpuacct.txt |   18 +++++++
>  kernel/sched.c                    |   87 +++++++++++++++++++++++++++++++++++---
>  2 files changed, 99 insertions(+), 6 deletions(-)
> 
> --- a/Documentation/cgroups/cpuacct.txt
> +++ b/Documentation/cgroups/cpuacct.txt
> @@ -30,3 +30,21 @@ The above steps create a new group g1 an
>  process (bash) into it. CPU time consumed by this bash and its children
>  can be obtained from g1/cpuacct.usage and the same is accumulated in
>  /cgroups/cpuacct.usage also.
> +
> +cpuacct.stat file lists a few statistics which further divide the
> +CPU time obtained by the cgroup into user and system times. Currently
> +the following statistics are supported:
> +
> +utime: Time spent by tasks of the cgroup in user mode.
> +stime: Time spent by tasks of the cgroup in kernel mode.
> +

Bharata can we move away from stime, utime (names) to system and user with
time being an implicit unit. I would like to see softirq, hardirq, etc
times in the future being added.

-- 
	Balbir
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