From: Peter Zijlstra <peterz@infradead.org>
To: Rik van Riel <riel@redhat.com>
Cc: linux-kernel@vger.kernel.org, chegu_vinod@hp.com,
mgorman@suse.de, mingo@kernel.org
Subject: Re: [PATCH 9/7] sched,numa: remove task_h_load from task_numa_compare
Date: Wed, 25 Jun 2014 07:57:08 +0200 [thread overview]
Message-ID: <20140625055708.GG6758@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <53AA608F.50301@redhat.com>
[-- Attachment #1: Type: text/plain, Size: 1421 bytes --]
On Wed, Jun 25, 2014 at 01:39:27AM -0400, Rik van Riel wrote:
>
> Here it goes:
>
> When CONFIG_FAIR_GROUP_SCHED is enabled, the load that a task places
> on a CPU is determined by the group the task is in. The active groups
> on the source and destination CPU can be different, resulting in a
> different load contribution by the same task at its source and at its
> destination. As a result, the load needs to be calculated separately
> for each CPU, instead of estimated once with task_h_load.
>
> Getting this calculation right allows some workloads to converge,
> where previously the last thread could get stuck on another node,
> without being able to migrate to its final destination.
>
Thanks!
>
>
> - --
> All rights reversed
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1
> Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/
>
> iQEcBAEBAgAGBQJTqmCPAAoJEM553pKExN6D4/IH/1Ez7G3jAnYFpQYvH/wSm75V
> kbH+mouLAqeICjHRdXAr1SGuD8i85JeUeDU2+SymdhC+hwZXbvR/aQfX0/ok4kN7
> e7kJbaNS6Lrq3bDjm74aTpMKB+zK2OExqR1DQBXwynbUahAyx3+9uXNDYp35yZwo
> tt+h3Rdrmy2lTTpE0fuEjGc8ODrEJjeWyYAVxT/aQXnwgfXfp6BZ1SEXyRRmrxR0
> BunsgWTO7uBxGGEIZrrm/l7mdIrsi4oAN9C4RA7v6LMR6cUW9Fj5o6iva9X714wG
> txP4/AGowucS5VckN1RIaM8/pzMB3MVuAmCTX4PqWg1jf3eggcQpe5/4/bVYUqQ=
> =QgYM
> -----END PGP SIGNATURE-----
http://www.tummy.com/blogs/2008/09/05/enigmail-message-composition-and-mutt/
[-- Attachment #2: Type: application/pgp-signature, Size: 836 bytes --]
prev parent reply other threads:[~2014-06-25 5:57 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-23 15:41 [PATCH 0/7] sched,numa: improve NUMA convergence times riel
2014-06-23 15:41 ` [PATCH 1/7] sched,numa: use group's max nid as task's preferred nid riel
2014-06-25 10:31 ` Mel Gorman
2014-07-05 10:44 ` [tip:sched/core] sched/numa: Use group's max nid as task' s " tip-bot for Rik van Riel
2014-06-23 15:41 ` [PATCH 3/7] sched,numa: use effective_load to balance NUMA loads riel
2014-06-23 15:41 ` [PATCH 4/7] sched,numa: simplify task_numa_compare riel
2014-06-25 10:39 ` Mel Gorman
2014-06-23 15:41 ` [PATCH 5/7] sched,numa: examine a task move when examining a task swap riel
2014-06-23 15:41 ` [PATCH 6/7] sched,numa: rework best node setting in task_numa_migrate riel
2014-07-05 10:45 ` [tip:sched/core] sched/numa: Rework best node setting in task_numa_migrate() tip-bot for Rik van Riel
2014-06-23 15:41 ` [PATCH 7/7] sched,numa: change scan period code to match intent riel
2014-06-25 10:19 ` Mel Gorman
2014-07-05 10:45 ` [tip:sched/core] sched/numa: Change " tip-bot for Rik van Riel
2014-06-23 22:30 ` [PATCH 8/7] sched,numa: do not let a move increase the imbalance Rik van Riel
2014-06-24 14:38 ` Peter Zijlstra
2014-06-24 15:30 ` Rik van Riel
2014-06-25 1:57 ` Rik van Riel
2014-06-24 19:14 ` [PATCH 9/7] sched,numa: remove task_h_load from task_numa_compare Rik van Riel
2014-06-25 5:07 ` Peter Zijlstra
2014-06-25 5:09 ` Rik van Riel
2014-06-25 5:21 ` Peter Zijlstra
2014-06-25 5:25 ` Rik van Riel
2014-06-25 5:31 ` Peter Zijlstra
2014-06-25 5:39 ` Rik van Riel
2014-06-25 5:57 ` Peter Zijlstra [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=20140625055708.GG6758@twins.programming.kicks-ass.net \
--to=peterz@infradead.org \
--cc=chegu_vinod@hp.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mgorman@suse.de \
--cc=mingo@kernel.org \
--cc=riel@redhat.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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
Powered by JetHome