From: Daniel Walker <dwalker@mvista.com>
To: Ulrich Drepper <drepper@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/3] futex: fix miss ordered wakeups
Date: Thu, 22 May 2008 22:15:19 -0700 [thread overview]
Message-ID: <1211519720.18130.98.camel@localhost.localdomain> (raw)
In-Reply-To: <a36005b50805222202v6ea7b50p988eab5524935e1a@mail.gmail.com>
On Thu, 2008-05-22 at 22:02 -0700, Ulrich Drepper wrote:
> On Thu, May 22, 2008 at 12:00 AM, Daniel Walker <dwalker@mvista.com> wrote:
> > This patch corrects this issue, so the tasks are always woken in priority
> > order.
>
> This is completely unnecessary overhead for 99.999% of all cases. It
> was deliberately not done. You slowing things down for everybody. If
> you want priorities, then use PI futexes.
That's the problem we aren't just covering 99.99% we're trying to cover
100% of cases.. If we don't do it in that one case we may as well not do
it at all.
Daniel
next prev parent reply other threads:[~2008-05-23 5:15 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-22 7:00 [PATCH 1/3] mutex debug: add generic blocked_on usage Daniel Walker
2008-05-22 7:00 ` [PATCH 2/3] rtmutex: " Daniel Walker
2008-05-22 7:00 ` [PATCH 3/3] futex: fix miss ordered wakeups Daniel Walker
2008-05-23 5:02 ` Ulrich Drepper
2008-05-23 5:15 ` Daniel Walker [this message]
2008-05-23 5:24 ` Ulrich Drepper
2008-05-23 5:36 ` Daniel Walker
2008-05-24 3:38 ` Ulrich Drepper
2008-05-24 8:55 ` Thomas Gleixner
2008-05-24 15:32 ` Daniel Walker
2008-05-24 17:03 ` Thomas Gleixner
2008-05-24 17:24 ` Daniel Walker
2008-05-24 18:35 ` Thomas Gleixner
2008-05-24 19:19 ` Daniel Walker
2008-05-24 20:34 ` Arjan van de Ven
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