From: Robert Love <rml@tech9.net>
To: Pavel Machek <pavel@ucw.cz>
Cc: Wessel Dankers <wsl@fruit.eu.org>, linux-kernel@vger.kernel.org
Subject: Re: Scheduler priorities
Date: 29 Mar 2002 18:52:21 -0500 [thread overview]
Message-ID: <1017445941.2940.78.camel@phantasy> (raw)
In-Reply-To: <20020329214252.GA9974@elf.ucw.cz>
On Fri, 2002-03-29 at 16:42, Pavel Machek wrote:
> On each entry of kernel, promote SCHED_IDLE task to SCHED_NORMAL, and
> demote it at exit. This can be done with 0 overhad on hot paths.
Agreed.
> What's the problem with "promote at enter" approach? Using ptrace
> trick, it can be 0 overhead. [Was that your code that cleverly used
> ptrace?] What is problem with it?
There is no problem with the ptrace approach, it is good - I have
experimented with that solution myself. There is just a lot more to
SCHED_IDLE than "make the task only run when nothing else wants to" and
even the ptrace solution may involve a bit of work.
Robert Love
prev parent reply other threads:[~2002-03-29 23:52 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-26 11:41 Scheduler priorities Nuno Miguel Rodrigues
2002-03-26 17:55 ` Mike Fedyk
2002-03-27 9:41 ` Frank Schaefer
2002-03-27 13:06 ` Nuno Miguel Rodrigues
2002-03-27 13:41 ` Robert Love
2002-03-27 20:23 ` Wessel Dankers
2002-03-27 21:14 ` Robert Love
2002-03-28 7:08 ` Wessel Dankers
2002-03-28 7:29 ` Robert Love
2002-03-29 21:42 ` Pavel Machek
2002-03-29 23:52 ` Robert Love [this message]
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