From: Arjan van de Ven <arjanv@redhat.com>
To: root@chaos.analogic.com
Cc: linux-kernel@vger.kernel.org
Subject: Re: SCHED_YIELD undeclared with Trond's NFS patch w/2.4.19-pre2-ac2
Date: Thu, 07 Mar 2002 14:20:00 +0000 [thread overview]
Message-ID: <3C877710.CAE1AFD3@redhat.com> (raw)
In-Reply-To: <20020307084514.C16224@lapsony.mydomain.here> <Pine.LNX.3.95.1020307085809.19727A-100000@chaos.analogic.com>
> You need to change loops that do something like:
>
> while(something)
> {
> current->policy |= SCHED_YIELD;
> schedule();
> }
>
> to:
>
> while(something)
> sys_sched_yield();
>
such loops are a great way to create livelock and other nasties in the
kernel
and should be avoided at all cost (esp if you use preemptable kernels)
next prev parent reply other threads:[~2002-03-07 14:20 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-07 13:45 SCHED_YIELD undeclared with Trond's NFS patch w/2.4.19-pre2-ac2 Steven A. DuChene
2002-03-07 13:54 ` Morten Helgesen
2002-03-07 14:00 ` Richard B. Johnson
2002-03-07 14:20 ` Arjan van de Ven [this message]
2002-03-07 14:58 ` Richard B. Johnson
2002-03-07 14:20 ` Steven A. DuChene
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