Date: Fri, 29 Feb 2008 14:32:35 +0300
From: Oleg Nesterov <oleg@tv-sign.ru>
To: Roland McGrath <roland@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>, Pavel Emelyanov <xemul@openvz.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 3/3] Consolidate send_sigqueue and send_group_sigqueue
Message-ID: <20080229113235.GA359@tv-sign.ru>
References: <47BEC663.7050904@openvz.org> <20080222144155.GA4349@tv-sign.ru> <alpine.LFD.1.00.0802280546360.7583@apollo.tec.linutronix.de> <20080228061723.GB108@tv-sign.ru> <20080228113633.7431C2700FD@magilla.localdomain> <20080228153655.GC11484@tv-sign.ru> <20080228201450.F23BB2700FD@magilla.localdomain>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20080228201450.F23BB2700FD@magilla.localdomain>
User-Agent: Mutt/1.5.11
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1161
Lines: 25

On 02/28, Roland McGrath wrote:
>
> > > I'm not clear on how the already-queued case could ever happen.  Do we
> > > really need that check at all?  It shouldn't be possible for the timer to
> > > be firing when it's already queued, because it won't have been reloaded.
> > > It only reloads via do_schedule_next_timer after it's dequeued, or because
> > > a 1 return value said it never was queued.
> > 
> > This is true for the posix timers, but posix cpu timers case is different.
> > Note the run_posix_cpu_timers()->cpu_timer_fire().
> 
> Really?  It too reloads the CPU timer only when posix_timer_event returns
> nonzero, and otherwise expects do_schedule_next_timer to be called from
> signal dequeuing and call posix_cpu_timer_schedule to do the reload.

Ah. Thanks for correcting me! Looks like I forgot this code completely.
Indeed, check_thread/process_timers() removes cpu_timer_list from list.

Oleg.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/