From: Ingo Molnar <mingo@elte.hu>
To: Bill Davidsen <davidsen@tmr.com>
Cc: Ulrich Drepper <drepper@gmail.com>,
linux-kernel@vger.kernel.org, jakub@redhat.com
Subject: Re: [PATCH] 2.6.16 - futex: small optimization (?)
Date: Fri, 31 Mar 2006 20:15:48 +0200 [thread overview]
Message-ID: <20060331181548.GA25053@elte.hu> (raw)
In-Reply-To: <442D41B1.1070005@tmr.com>
* Bill Davidsen <davidsen@tmr.com> wrote:
> >What are you suggesting here, that the implementation of
> >FUTEX_WAKE_OP is "ignoring inefficiencies"? Please explain why and
> >what you would do differently to solve that inefficiency.
>
> I am suggesting that "There are no such situations anymore in an
> optimal userlevel implementation" is not the right approach to the
> original post. What I would do differently is to evaluate the original
> suggestion to see if it would in fact be more efficient. [...]
that's what we did a year ago for a similar futex rescheduling
inefficiency, and came up with the FUTEX_WAKE_OP solution, which is now
part of the kernel and is used by glibc. But we are all ears for
alternative suggestions.
Ingo
next prev parent reply other threads:[~2006-03-31 18:18 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-28 7:37 [PATCH] 2.6.16 - futex: small optimization (?) Pierre PEIFFER
2006-03-28 10:05 ` Eric Dumazet
2006-03-28 15:02 ` Ulrich Drepper
2006-03-28 22:46 ` Bill Davidsen
2006-03-29 15:26 ` Ingo Molnar
2006-03-30 20:27 ` Bill Davidsen
2006-03-31 6:01 ` Ingo Molnar
2006-03-31 14:50 ` Bill Davidsen
2006-03-31 18:15 ` Ingo Molnar [this message]
2006-03-29 13:18 ` Pierre PEIFFER
2006-03-29 15:26 ` Eric Dumazet
2006-03-30 14:51 ` Pierre PEIFFER
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