linux-kernel - Re: [PATCH 3/3] futex: fix miss ordered wakeups

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1211519720.18130.98.camel@localhost.localdomain>
Date:	Thu, 22 May 2008 22:15:19 -0700
From:	Daniel Walker <dwalker@...sta.com>
To:	Ulrich Drepper <drepper@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] futex: fix miss ordered wakeups


On Thu, 2008-05-22 at 22:02 -0700, Ulrich Drepper wrote:
> On Thu, May 22, 2008 at 12:00 AM, Daniel Walker <dwalker@...sta.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

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