Re: [PATCH] timer: add_timer_on() should perform proper migration

From	Tejun Heo <tj@kernel.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH] timer: add_timer_on() should perform proper migration
Date	2015-11-04 20:50 +0100
Message-ID	<qrcee-4Ne-9@gated-at.bofh.it> (permalink)
References	(5 earlier) <qqSIz-vE-19@gated-at.bofh.it> <qqTOh-1pC-7@gated-at.bofh.it> <qr4JH-8jO-3@gated-at.bofh.it> <qr9T4-3m9-13@gated-at.bofh.it> <qrc4y-4EN-17@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

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
--
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/

Back to linux.kernel | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

Re: timer code oops when calling mod_delayed_work Tejun Heo <tj@kernel.org> - 2015-10-31 22:40 +0100
  Re: timer code oops when calling mod_delayed_work Jeff Layton <jlayton@poochiereds.net> - 2015-10-31 23:00 +0100
    Re: timer code oops when calling mod_delayed_work Chris Worley <chris.worley@primarydata.com> - 2015-11-02 20:50 +0100
      Re: timer code oops when calling mod_delayed_work Jeff Layton <jlayton@poochiereds.net> - 2015-11-02 21:00 +0100
        Re: timer code oops when calling mod_delayed_work Jeff Layton <jlayton@poochiereds.net> - 2015-11-03 02:40 +0100
          Re: timer code oops when calling mod_delayed_work Jeff Layton <jlayton@poochiereds.net> - 2015-11-03 19:00 +0100
            Re: timer code oops when calling mod_delayed_work Tejun Heo <tj@kernel.org> - 2015-11-04 00:00 +0100
              Re: timer code oops when calling mod_delayed_work Tejun Heo <tj@kernel.org> - 2015-11-04 01:10 +0100
                Re: timer code oops when calling mod_delayed_work Jeff Layton <jlayton@poochiereds.net> - 2015-11-04 12:50 +0100
                [PATCH] timer: add_timer_on() should perform proper migration Tejun Heo <tj@kernel.org> - 2015-11-04 18:20 +0100
                [tip:timers/urgent] timers:   Use proper base migration in add_timer_on() tip-bot for Tejun Heo <tipbot@zytor.com> - 2015-11-04 20:30 +0100
                Re: [PATCH] timer: add_timer_on() should perform proper migration Thomas Gleixner <tglx@linutronix.de> - 2015-11-04 20:40 +0100
                Re: [PATCH] timer: add_timer_on() should perform proper migration Tejun Heo <tj@kernel.org> - 2015-11-04 20:50 +0100

csiph-web