linux-kernel - Re: [PATCH 1/3] cgroups: Add an API to attach a task to current task's cgroup

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Message-ID: <20100525165334.GA27307@redhat.com>
Date:	Tue, 25 May 2010 19:53:34 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Paul Menage <menage@...gle.com>
Cc:	Sridhar Samudrala <samudrala.sridhar@...il.com>,
	netdev <netdev@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	containers@...ts.linux-foundation.org, lizf@...fujitsu.com
Subject: Re: [PATCH 1/3] cgroups: Add an API to attach a task to current
	task's cgroup

On Thu, May 20, 2010 at 03:22:15PM -0700, Paul Menage wrote:
> On Tue, May 18, 2010 at 5:04 PM, Sridhar Samudrala
> <samudrala.sridhar@...il.com> wrote:
> > Add a new kernel API to attach a task to current task's cgroup
> > in all the active hierarchies.
> >
> > Signed-off-by: Sridhar Samudrala <sri@...ibm.com>
> 
> Reviewed-by: Paul Menage <menage@...gle.com>
> 
> It would be more efficient to just attach directly to current->cgroups
> rather than potentially creating/destroying one css_set for each
> hierarchy until we've completely converged on current->cgroups - but
> that would require a bunch of refactoring of the guts of
> cgroup_attach_task() to ensure that the right can_attach()/attach()
> callbacks are made. That doesn't really seem worthwhile right now for
> the initial use, that I imagine isn't going to be
> performance-sensitive.
> 
> Paul

Is this patch suitable for 2.6.35?
It is needed to fix the case where vhost user might cause a kernel thread
to consume more CPU than allowed by the cgroup.
Should I just merge it through the vhost tree?
Ack for this?

Thanks,

-- 
MST
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