From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Jens Axboe <axboe@kernel.dk>
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 12:08:11 +0100 [thread overview]
Message-ID: <1327576091.2446.87.camel@twins> (raw)
In-Reply-To: <4F212DFF.8060802@kernel.dk>
On Thu, 2012-01-26 at 11:42 +0100, Jens Axboe wrote:
> On 01/25/2012 03:53 PM, Peter Zijlstra wrote:
> > Jens, what is this thing trying to do?
>
>The intent of the code
> is to return the first CPU in the "group" that the passed in core/thread
> belongs to. This is used to decide whether to perform a completion
> locally, or to send it off to a different "group".
Would you perhaps have meant to identify some shared cache domain?
In the scheduler core code we have (for CONFIG_SMP):
static int ttwu_share_cache(int this_cpu, int that_cpu);
which returns true if this and that share a cache and false otherwise.
Would that suffice or do you need a slightly different form? That is, we
should provide you with some API and avoid you having to poke around
with CONFIG_SCHED* and topology bits methinks.
next prev parent reply other threads:[~2012-01-26 11:08 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 [this message]
2012-01-26 11:26 ` Jens Axboe
2012-01-26 12:04 ` Peter Zijlstra
2012-01-26 12:13 ` Jens Axboe
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1327576091.2446.87.camel@twins \
--to=a.p.zijlstra@chello.nl \
--cc=arjan@linux.intel.com \
--cc=axboe@kernel.dk \
--cc=indan@nul.nu \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=suresh.b.siddha@intel.com \
--cc=svaidy@linux.vnet.ibm.com \
--cc=vincent.guittot@linaro.org \
--cc=youquan.song@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.