From: Robert Love <rml@tech9.net>
To: Andrew Morton <akpm@digeo.com>
Cc: Dave Hansen <haveblue@us.ibm.com>,
lkml <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Ingo Molnar <mingo@redhat.com>
Subject: Re: 2.5.40-mm2
Date: 06 Oct 2002 18:38:05 -0400 [thread overview]
Message-ID: <1033943886.26955.33.camel@phantasy> (raw)
In-Reply-To: <3DA0BA33.5B295A46@digeo.com>
On Sun, 2002-10-06 at 18:33, Andrew Morton wrote:
> I think it's a way of doing "cond_resched() if cond_resched() is
> a legal thing to do right now".
>
> I'm sure David isn't using preempt though.
If the system is preemptible, then the call can be replaced with
preempt_check_resched() which avoids the unneeded inc and dec.
But if the system is preemptible, it probably does not accomplish much
because we will already have preempted (e.g. the interrupt handler that
woke up a new task set need_resched and on return from interrupt we
serviced it).
If the system is not preemptible (non-zero preempt_count here) this
accomplishes nothing.
Robert Love
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next prev parent reply other threads:[~2002-10-06 22:38 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-06 18:47 2.5.40-mm2 Andrew Morton
2002-10-06 20:47 ` 2.5.40-mm2 Dave Hansen
2002-10-06 21:55 ` 2.5.40-mm2 Andrew Morton
2002-10-06 22:07 ` 2.5.40-mm2 Andrew Morton
2002-10-06 22:11 ` 2.5.40-mm2 Andrew Morton
2002-10-07 5:46 ` 2.5.40-mm2 Dave Hansen
2002-10-06 22:23 ` 2.5.40-mm2 Robert Love
2002-10-06 22:33 ` 2.5.40-mm2 Andrew Morton
2002-10-06 22:38 ` Robert Love [this message]
2002-10-08 11:05 ` 2.5.40-mm2 Ingo Molnar
2002-10-08 16:23 ` 2.5.40-mm2 Dave Hansen
2002-10-08 16:43 ` 2.5.40-mm2 Dave Hansen
2002-10-08 16:56 ` 2.5.40-mm2 Andrew Morton
2002-10-09 8:12 ` 2.5.40-mm2 Ingo Molnar
2002-10-07 17:45 ` 2.5.40-mm2 Badari Pulavarty
2002-10-07 17:55 ` 2.5.40-mm2 Jens Axboe
2002-10-07 18:23 ` 2.5.40-mm2 Andrew Morton
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