From: Oleg Nesterov <oleg@tv-sign.ru>
To: Ravikiran G Thirumalai <kiran@scalex86.org>
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>,
dipankar@in.ibm.com
Subject: Re: [rfc][patch] Avoid taking global tasklist_lock for single threadedprocess at getrusage()
Date: Wed, 18 Jan 2006 12:17:52 +0300 [thread overview]
Message-ID: <43CE07C0.DA9B254A@tv-sign.ru> (raw)
In-Reply-To: 20060117195237.GA5289@localhost.localdomain
Ravikiran G Thirumalai wrote:
>
> On Tue, Jan 17, 2006 at 10:59:02PM +0300, Oleg Nesterov wrote:
> >
> > But don't we already discussed this issue? I think that RUSAGE_SELF
> > case always not 100% accurate, so it is Ok to ignore this race.
>
> Take the case when an exiting thread has a large utime stime value, and
> rusage reports utime before thread exit and stime after thread exit... the
> result would look wierd.
> So IMHO, while inaccuracies in task_struct->xxx time can be tolerated, it
> might not be such a good idea to for task_struct->signal->xxx counters.
Yes, you are right. Now I don't understand why I didn't understand this
before. Thank you, Ravikiran.
Oleg.
next prev parent reply other threads:[~2006-01-18 8:01 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
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 [this message]
2006-01-03 18:18 ` Christoph Lameter
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