From: Ravikiran G Thirumalai <kiran@scalex86.org>
To: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Christoph Lameter <clameter@engr.sgi.com>,
Shai Fultheim <shai@scalex86.org>,
Nippun Goel <nippung@calsoftinc.com>,
linux-kernel@vger.kernel.org, Andrew Morton <akpm@osdl.org>
Subject: Re: [rfc][patch] Avoid taking global tasklist_lock for single threadedprocess at getrusage()
Date: Wed, 28 Dec 2005 10:33:45 -0800 [thread overview]
Message-ID: <20051228183345.GA3755@localhost.localdomain> (raw)
In-Reply-To: <43B2874F.F41A9299@tv-sign.ru>
On Wed, Dec 28, 2005 at 03:38:39PM +0300, Oleg Nesterov wrote:
> Christoph Lameter wrote:
> >
> > On Sat, 24 Dec 2005, Oleg Nesterov wrote:
> >
> > > I can't understand this. 'p' can do clone(CLONE_THREAD) immediately
> > > after 'if (!thread_group_empty(p))' check.
> >
> > Only if p != current. As discussed later the lockless approach is
> > intened to only be used if p == current.
>
> Unless I missed something this function (getrusage_both) is called
> from wait_noreap_copyout,
Hi Oleg,
Yes, this patch needs to be reworked. I am on it. I'd also missed that
p->signal was protected by the tasklist_lock. Thanks for pointing it out.
I will put out the modified version soon.
Thanks,
Kiran
next prev parent reply other threads:[~2005-12-28 18:33 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-24 17:52 [rfc][patch] Avoid taking global tasklist_lock for single threaded process at getrusage() Oleg Nesterov
2005-12-27 20:21 ` Christoph Lameter
2005-12-28 12:38 ` [rfc][patch] Avoid taking global tasklist_lock for single threadedprocess " Oleg Nesterov
2005-12-28 18:33 ` Ravikiran G Thirumalai [this message]
2005-12-28 22:57 ` Ravikiran G Thirumalai
2005-12-30 17:57 ` Oleg Nesterov
2006-01-04 23:16 ` Ravikiran G Thirumalai
2006-01-05 19:17 ` Oleg Nesterov
2006-01-06 9:46 ` Ravikiran G Thirumalai
2006-01-06 17:23 ` Christoph Lameter
2006-01-06 19:46 ` Ravikiran G Thirumalai
2006-03-20 18:04 ` Oleg Nesterov
2006-03-22 22:18 ` Ravikiran G Thirumalai
2006-03-23 18:18 ` Oleg Nesterov
2006-01-06 23:52 ` Andrew Morton
2006-01-08 11:49 ` Oleg Nesterov
2006-01-08 19:58 ` Ravikiran G Thirumalai
2006-01-09 18:55 ` Oleg Nesterov
2006-01-09 20:54 ` Ravikiran G Thirumalai
2006-01-10 19:03 ` Oleg Nesterov
2006-01-16 20:56 ` Ravikiran G Thirumalai
2006-01-17 19:59 ` Oleg Nesterov
2006-01-17 19:52 ` Ravikiran G Thirumalai
2006-01-18 9:17 ` Oleg Nesterov
2006-01-03 18:18 ` Christoph Lameter
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