From: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
To: Li Zefan <lizefan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
Cc: LKML <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
cgroups <cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [PATCH v2 05/12] cpuset: use effective cpumask to build sched domains
Date: Tue, 15 Oct 2013 11:25:38 -0400 [thread overview]
Message-ID: <20131015152538.GL3141@htj.dyndns.org> (raw)
In-Reply-To: <5257C9EE.9080902-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
On Fri, Oct 11, 2013 at 05:50:38PM +0800, Li Zefan wrote:
> @@ -930,10 +931,21 @@ static void update_cpumasks_hier(struct cpuset *cs, struct cpuset *trialcs,
>
> update_tasks_cpumask(cp, heap);
>
> + /*
> + * If the effective cpumask of any non-empty cpuset is
> + * changed, we need to rebuild sched domains.
> + */
> + if (!cpumask_empty(cp->cpus_allowed) &&
> + is_sched_load_balance(cp))
> + need_rebuild_sched_domains = true;
> +
Can you please explain *why* this change is being made in the patch
description? The patch description doesn't give me anything and the
comment explain "what" but not why it's moved from update_cpumask()
into this function with an extra condition.
Thanks.
--
tejun
next prev parent reply other threads:[~2013-10-15 15:25 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-11 9:49 [PATCH v2 00/12] cpuset: separate configured masks and effective masks Li Zefan
[not found] ` <5257C9A1.1030404-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2013-10-11 9:49 ` [PATCH v2 01/12] cpuset: add cs->effective_cpus and cs->effective_mems Li Zefan
2013-10-11 9:49 ` [PATCH v2 02/12] cpuset: update cpuset->effective_{cpus,mems} at hotplug Li Zefan
2013-10-11 9:50 ` [PATCH v2 03/12] cpuset: update cs->effective_{cpus,mems} when config changes Li Zefan
[not found] ` <5257C9CC.3080806-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2013-10-15 15:18 ` Tejun Heo
2013-10-11 9:50 ` [PATCH v2 04/12] cpuset: inherit ancestor's masks if effective_{cpus,mems} becomes empty Li Zefan
2013-10-11 9:50 ` [PATCH v2 05/12] cpuset: use effective cpumask to build sched domains Li Zefan
[not found] ` <5257C9EE.9080902-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2013-10-15 15:25 ` Tejun Heo [this message]
2013-10-11 9:50 ` [PATCH v2 06/12] cpuset: initialize top_cpuset's configured masks at mount Li Zefan
2013-10-11 9:51 ` [PATCH v2 07/12] cpuset: apply cs->effective_{cpus,mems} Li Zefan
2013-10-11 9:51 ` [PATCH v2 08/12] cpuset: make cs->{cpus,mems}_allowed as user-configured masks Li Zefan
2013-10-11 9:51 ` [PATCH v2 09/12] cpuset: refactor cpuset_hotplug_update_tasks() Li Zefan
2013-10-11 9:51 ` [PATCH v2 10/12] cpuset: enable onlined cpu/node in effective masks Li Zefan
2013-10-11 9:51 ` [PATCH v2 11/12] cpuset: allow writing offlined masks to cpuset.cpus/mems Li Zefan
2013-10-15 15:36 ` Tejun Heo
2013-10-11 9:52 ` [PATCH v2 12/12] cpuset: export effective masks to userspace Li Zefan
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