From: Mike Fedyk <mfedyk@matchmail.com>
To: Robert Love <rml@tech9.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] preempt-kernel on 2.4.19-pre2-ac2 bugfix
Date: Mon, 4 Mar 2002 16:41:30 -0800 [thread overview]
Message-ID: <20020305004130.GK353@matchmail.com> (raw)
In-Reply-To: <1015287791.882.25.camel@phantasy>
In-Reply-To: <1015287791.882.25.camel@phantasy>
On Mon, Mar 04, 2002 at 07:23:10PM -0500, Robert Love wrote:
> The same schedule_tail bug affecting 2.5 affects 2.4 with O(1). I.e.,
> 2.4.19-pre2-ac2.
>
> In recent O(1) scheduler releases, an optimization was made that removed
> schedule_tail from UP kernels. This causes the initial preempt_count of
> a new task, which starts at 1, to never decrement to zero and thus never
> become preemptible. CONFIG_PREEMPT requires schedule_tail, too.
>
> Users of 2.4+O(1)+preempt (i.e. -ac) should use this patch:
>
I believe you want to say that O(1)sched is in -ac, and this patch will add
preempt on top of that, not that preempt is already in -ac (unless I missed
something...)
Mike
next prev parent reply other threads:[~2002-03-05 0:40 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-05 0:23 [PATCH] preempt-kernel on 2.4.19-pre2-ac2 bugfix Robert Love
2002-03-05 0:41 ` Mike Fedyk [this message]
2002-03-05 0:52 ` Robert Love
2002-03-07 23:21 ` Mike Fedyk
2002-03-07 23:46 ` Alan Cox
2002-03-08 0:05 ` Mike Fedyk
2002-03-08 0:38 ` Alan Cox
2002-03-08 2:27 ` Mike Fedyk
2002-03-08 13:21 ` Alan Cox
2002-03-08 19:26 ` Mike Fedyk
2002-03-09 23:35 ` Mike Fedyk
2002-03-10 0:53 ` Alan Cox
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