From: Paul Jackson <pj@sgi.com>
To: Anton Blanchard <anton@samba.org>
Cc: akpm@osdl.org, simon.derr@bull.net, nathanl@austin.ibm.com,
linux-kernel@vger.kernel.org
Subject: Re: cpusets not cpu hotplug aware
Date: Wed, 23 Aug 2006 12:08:38 -0700 [thread overview]
Message-ID: <20060823120838.efbd79c2.pj@sgi.com> (raw)
In-Reply-To: <20060823145817.GA28175@krispykreme>
Anton wrote:
> We have a userspace visible change to the sched
> affinity API when the cpusets option is enabled.
Yup - on cpuset kernels, sched_setaffinity is constrained to CPUs in a
tasks cpuset. Also mbind and set_mempolicy are constrained to nodes in
the tasks cpuset.
This is a long standing, intentional part of the cpuset design.
Using udev isn't papering over it. It's reflecting the reasonable
preference and expectation on systems using hotplug/unplug that
the default cpuset dynamically reflect the current online maps,
not the static maps as they were at boot. And using udev is using
just the sort of mechanism one might expect to be used to adjust
the system when devices go on or off line.
--
I won't rest till it's the best ...
Programmer, Linux Scalability
Paul Jackson <pj@sgi.com> 1.925.600.0401
prev parent reply other threads:[~2006-08-23 19:08 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-21 13:27 cpusets not cpu hotplug aware Anton Blanchard
2006-08-21 13:54 ` Simon Derr
2006-08-21 17:43 ` Paul Jackson
2006-08-21 19:21 ` Anton Blanchard
2006-08-21 20:42 ` [PATCH] cpuset code prevents binding tasks to new cpus Nathan Lynch
2006-08-21 23:04 ` Paul Jackson
2006-08-21 23:27 ` Nathan Lynch
2006-08-22 4:42 ` Paul Jackson
2006-08-22 5:07 ` Andrew Morton
2006-08-21 21:01 ` cpusets not cpu hotplug aware Paul Jackson
2006-08-22 4:51 ` Andrew Morton
2006-08-22 5:04 ` Nathan Lynch
2006-08-22 5:11 ` Andrew Morton
2006-08-22 5:14 ` Paul Jackson
2006-08-23 22:11 ` Nathan Lynch
2006-08-23 22:39 ` Paul Jackson
2006-08-23 23:39 ` Nathan Lynch
2006-08-24 2:19 ` Paul Jackson
2006-08-23 23:49 ` Nathan Lynch
2006-08-24 0:12 ` Andrew Morton
2006-08-24 0:48 ` [PATCH] cpuset code prevents binding tasks to new cpus Nathan Lynch
2006-08-24 2:54 ` cpusets not cpu hotplug aware Paul Jackson
2006-08-22 5:06 ` Paul Jackson
2006-08-22 5:14 ` Andrew Morton
2006-08-22 5:21 ` Paul Jackson
2006-08-23 14:58 ` Anton Blanchard
2006-08-23 18:59 ` Paul Jackson
2006-08-23 19:08 ` Paul Jackson [this message]
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=20060823120838.efbd79c2.pj@sgi.com \
--to=pj@sgi.com \
--cc=akpm@osdl.org \
--cc=anton@samba.org \
--cc=linux-kernel@vger.kernel.org \
--cc=nathanl@austin.ibm.com \
--cc=simon.derr@bull.net \
/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.