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

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Date:	Fri, 21 May 2010 08:09:14 -0700
From:	Sridhar Samudrala <sri@...ibm.com>
To:	Paul Menage <menage@...gle.com>
CC:	Sridhar Samudrala <samudrala.sridhar@...il.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	netdev <netdev@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] cgroups: Add an API to attach a task to current task's
 cgroup

On 5/20/2010 3:22 PM, 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.
>    
Yes. In our use-case, this will be called only once per guest interface 
when the guest comes up.
Hope you or someone more familiar with cgroups subsystem can optimize 
this function later.

Thanks
Sridhar

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