To: Ingo Molnar <mingo@elte.hu>
Cc: Chris Wright <chrisw@osdl.org>, Matt Mackall <mpm@selenic.com>,
       Paul Davis <paul@linuxaudiosystems.com>,
       Christoph Hellwig <hch@infradead.org>, Andrew Morton <akpm@osdl.org>,
       Lee Revell <rlrevell@joe-job.com>, arjanv@redhat.com,
       alan@lxorguk.ukuu.org.uk, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] [request for inclusion] Realtime LSM
References: <200501111305.j0BD58U2000483@localhost.localdomain>
	<20050111191701.GT2940@waste.org>
	<20050111125008.K10567@build.pdx.osdl.net>
	<20050111205809.GB21308@elte.hu>
	<20050111131400.L10567@build.pdx.osdl.net>
	<20050111212719.GA23477@elte.hu> <87fz15j325.fsf@sulphur.joq.us>
	<20050115134922.GA10114@elte.hu> <874qhiwb1q.fsf@sulphur.joq.us>
	<871xcmuuu4.fsf@sulphur.joq.us> <20050116231307.GC24610@elte.hu>
From: "Jack O'Quin" <joq@io.com>
Date: Sun, 16 Jan 2005 17:57:23 -0600
In-Reply-To: <20050116231307.GC24610@elte.hu> (Ingo Molnar's message of
 "Mon, 17 Jan 2005 00:13:07 +0100")
Message-ID: <87vf9xdj18.fsf@sulphur.joq.us>
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> * Jack O'Quin <joq@io.com> wrote:
>> According to the manpage, nice(2) is per-process not per-thread.  That
>> does not give the granularity we need. 

Ingo Molnar <mingo@elte.hu> writes:
> the manpage is incorrect - sys_nice() is per-thread. (Btw., you could
> use setpriority() too.)

OK.  Where is this stuff documented?

BTW, I think this violates POSIX, which states...

  The nice value set with nice() shall be applied to the process. If
  the process is multi-threaded, the nice value shall affect all
  system scope threads in the process.

(It does not affect SCHED_FIFO or SCHED_RR threads, however.)

Is it possible to call sched_setscheduler() with a thread ID instead
of a pid?  That's what I really need.  JACK sets and resets the thread
priorities from a different thread.
-- 
  joq
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