linux-kernel - Re: [tip:timers/urgent] posix timers: fix RLIMIT

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Message-ID: <20090324210536.GB14067@elte.hu>
Date:	Tue, 24 Mar 2009 22:05:36 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	linux-tip-commits@...r.kernel.org, linux-kernel@...r.kernel.org,
	hpa@...or.com, mingo@...hat.com, peterz@...radead.org,
	ia6432@...ox.ru, roland@...hat.com, tglx@...utronix.de
Subject: Re: [tip:timers/urgent] posix timers: fix RLIMIT_CPU && fork()


* Oleg Nesterov <oleg@...hat.com> wrote:

> On 03/23, Oleg Nesterov wrote:
> >
> > Commit-ID:  37bebc70d7ad4144c571d74500db3bb26ec0c0eb
> > Gitweb:     http://git.kernel.org/tip/37bebc70d7ad4144c571d74500db3bb26ec0c0eb
> > Author:     Oleg Nesterov <oleg@...hat.com>
> > AuthorDate: Mon, 23 Mar 2009 20:34:11 +0100
> > Committer:  Ingo Molnar <mingo@...e.hu>
> > CommitDate: Mon, 23 Mar 2009 20:43:35 +0100
> >
> > posix timers: fix RLIMIT_CPU && fork()
> >
> > See http://bugzilla.kernel.org/show_bug.cgi?id=12911
> >
> > copy_signal() copies signal->rlim, but RLIMIT_CPU is "lost". Because
> > posix_cpu_timers_init_group() sets cputime_expires.prof_exp = 0 and thus
> > fastpath_timer_check() returns false unless we have other cpu timers.
> >
> > This is the minimal fix for 2.6.29 (tested) and 2.6.28. The patch is not
> > optimal,
> 
> Ingo, please drop this patch, it is very suboptimal.

suboptimal why?

> My intent was to make the obviously correct patch for 2.6.29, but 
> since it was already released I'll send another one.

Please send it - thanks.

	Ingo
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