linux-kernel - Re: Per container statistics (containerstats)

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Message-ID: <6599ad830706071928y17190565qdecba65efc18d60@mail.gmail.com>
Date:	Thu, 7 Jun 2007 19:28:03 -0700
From:	"Paul Menage" <menage@...gle.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>, dev@...ru,
	xemul@...ru, serue@...ibm.com, vatsa@...ibm.com,
	ebiederm@...ssion.com, haveblue@...ibm.com,
	svaidy@...ux.vnet.ibm.com, balbir@...ibm.com, pj@....com,
	cpw@....com, ckrm-tech@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, containers@...ts.osdl.org,
	mbligh@...gle.com, rohitseth@...gle.com, devel@...nvz.org
Subject: Re: Per container statistics (containerstats)

On 6/7/07, Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
> > this needs tasklist_lock?
> >
>
> rcu_read_lock() should be fine. From Eric's patch at
>
> 2.6.17-mm2 - proc-remove-tasklist_lock-from-proc_pid_readdir.patch
>
> The patch mentions that "We don't need the tasklist_lock to safely
> iterate through processes anymore."

Containers V10 includes an iterator interface for listing the member
tasks of a container, which avoids scanning the entire tasklist.
Downside is that it currently requires taking a read_lock on a global
lock, but I hope to improve on that in the future.

Paul
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