From: Jens Axboe <axboe@kernel.dk>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Indan Zupancic <indan@nul.nu>,
Youquan Song <youquan.song@intel.com>,
Ingo Molnar <mingo@elte.hu>,
Arjan van de Ven <arjan@linux.intel.com>,
Suresh Siddha <suresh.b.siddha@intel.com>,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [RFC PATCH v1 1/2] sched: unified sched_powersavings sysfs tunable
Date: Thu, 26 Jan 2012 13:13:52 +0100 [thread overview]
Message-ID: <4F214380.2040601@kernel.dk> (raw)
In-Reply-To: <1327579450.2446.95.camel@twins>
On 01/26/2012 01:04 PM, Peter Zijlstra wrote:
> On Thu, 2012-01-26 at 12:26 +0100, Jens Axboe wrote:
>> O
>> Yeah, I think that would suit my purpose nicely, in fact. What level of
>> cache sharing is being used here? The block code wanted a per-socket
>> type operation, but since it's a heuristic, perhaps the above is even
>> better (or equivelant, perhaps).
>
> It uses the biggest shared cache exposed in the topology information the
> scheduler has (which is currently somewhat funny but is on the todo list
> for improvements).
>
> Effectively it ends up being the socket wide LLC for modern Intel chips
> though.
>
> Would something like the below work for you (compile tested only).
Yep, looks good to me, and an improvement for me not to carry this code
that doesn't really belong there.
--
Jens Axboe
next prev parent reply other threads:[~2012-01-26 12:14 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-16 16:22 [RFC PATCH v1 0/2] sched: unified sched_powersavings tunables Vaidyanathan Srinivasan
2012-01-16 16:22 ` [RFC PATCH v1 1/2] sched: unified sched_powersavings sysfs tunable Vaidyanathan Srinivasan
2012-01-25 14:53 ` Peter Zijlstra
2012-01-26 10:42 ` Jens Axboe
2012-01-26 11:08 ` Peter Zijlstra
2012-01-26 11:26 ` Jens Axboe
2012-01-26 12:04 ` Peter Zijlstra
2012-01-26 12:13 ` Jens Axboe [this message]
2012-01-26 12:39 ` Peter Zijlstra
2012-01-26 12:46 ` Jens Axboe
2012-01-28 12:06 ` [tip:sched/core] sched, block: Unify cache detection tip-bot for Peter Zijlstra
2012-01-27 9:35 ` [RFC PATCH v1 1/2] sched: unified sched_powersavings sysfs tunable Vaidyanathan Srinivasan
2012-01-25 14:57 ` Peter Zijlstra
2012-01-27 9:16 ` Vaidyanathan Srinivasan
2012-01-25 15:10 ` Peter Zijlstra
2012-01-25 15:12 ` Arjan van de Ven
2012-01-25 15:36 ` Peter Zijlstra
2012-01-27 9:22 ` Vaidyanathan Srinivasan
2012-01-27 9:40 ` Peter Zijlstra
2012-01-16 16:22 ` [RFC PATCH v1 2/2] sched: fix group_capacity for thread level consolidation Vaidyanathan Srinivasan
2012-01-25 15:38 ` Peter Zijlstra
2012-01-27 9:10 ` Vaidyanathan Srinivasan
2012-01-17 18:44 ` [RFC PATCH v1 0/2] sched: unified sched_powersavings tunables Vaidyanathan Srinivasan
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