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From: Tejun Heo <tj@kernel.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Chris Worley <chris.worley@primarydata.com>,
	linux-kernel@vger.kernel.org, bfields@fieldses.org,
	Michael Skralivetsky <michael.skralivetsky@primarydata.com>,
	Trond Myklebust <trond.myklebust@primarydata.com>,
	Shaohua Li <shli@fb.com>, Jeff Layton <jlayton@poochiereds.net>,
	kernel-team@fb.com
Subject: Re: [PATCH] timer: add_timer_on() should perform proper migration
Date: Wed, 4 Nov 2015 14:43:46 -0500	[thread overview]
Message-ID: <20151104194346.GA32152@mtj.duckdns.org> (raw)
In-Reply-To: <alpine.DEB.2.11.1511042025160.4032@nanos>

Hello, Thomas.

On Wed, Nov 04, 2015 at 08:35:00PM +0100, Thomas Gleixner wrote:
> nice detective work. This has been there forever. I really wonder why
> nobody ever triggered this before.

I guess there weren't enough concurrent del/add_timer_on() combos.
Workqueue recently switched to always use add_timer_on() from its
timer function making that a lot more frequent for heavy
mod_delayed_work_on() users and that's when it started surfacing.

Thanks.

-- 
tejun

      reply	other threads:[~2015-11-04 19:43 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-10-29 14:31 timer code oops when calling mod_delayed_work Jeff Layton
2015-10-29 17:58 ` Jeff Layton
2015-10-31  2:00   ` Tejun Heo
2015-10-31 11:34     ` Jeff Layton
2015-10-31 21:31       ` Tejun Heo
2015-10-31 21:54         ` Jeff Layton
2015-11-02 19:48           ` Chris Worley
2015-11-02 19:56             ` Jeff Layton
2015-11-03  1:33               ` Jeff Layton
2015-11-03 17:55                 ` Jeff Layton
2015-11-03 22:54                   ` Tejun Heo
2015-11-04  0:06                     ` Tejun Heo
2015-11-04 11:48                       ` Jeff Layton
2015-11-04 17:15                         ` [PATCH] timer: add_timer_on() should perform proper migration Tejun Heo
2015-11-04 19:27                           ` [tip:timers/urgent] timers: Use proper base migration in add_timer_on() tip-bot for Tejun Heo
2015-11-04 19:35                           ` [PATCH] timer: add_timer_on() should perform proper migration Thomas Gleixner
2015-11-04 19:43                             ` Tejun Heo [this message]

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