linux-kernel - Re: [RFC/PATCH -v2] Add sysfs control to modify a user's cpu share

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Message-ID: <20071004075750.GD9176@elte.hu>
Date:	Thu, 4 Oct 2007 09:57:50 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
Cc:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	lkml <linux-kernel@...r.kernel.org>, maneesh@...ux.vnet.ibm.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Sudhir Kumar <skumar@...ux.vnet.ibm.com>
Subject: Re: [RFC/PATCH -v2] Add sysfs control to modify a user's cpu share


* Dhaval Giani <dhaval@...ux.vnet.ibm.com> wrote:

> Hi Ingo,
> 
> Can you please drop commit b1add858a10cece3a68b2d8cb9e7350843700a58 (last
> version of this patch) and try this instead?

> Changelog since v1:
> 1. Added a mutex to serialize directory creation/destruction for a user in
>    sysfs
> 2. Added a spinlock in the task_group structure to serialize writes to
>    tg->shares.
> 3. Removed /proc/root_user_cpu_shares.
> 4. Added Documentation about the group scheduler.

thanks - I have added this to the queue.

i'm wondering about the following: could not (yet) existing UIDs be made 
configurable too? I.e. if i do this in a bootup script:

  echo 2048 > /sys/kernel/uids/500/cpu_share

this should just work too, regardless of there not being any UID 500 
tasks yet. Likewise, once configured, the /sys/kernel/uids/* directories 
(with the settings in them) should probably not go away either.

	Ingo
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