From: Peter Zijlstra <peterz@infradead.org>
To: Darren Hart <dvhart@linux.intel.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@elte.hu>,
richard.purdie@linuxfoundation.org
Subject: Re: [PATCH 2/2] sched: allow users with rtprio rlimit to change from SCHED_IDLE policy
Date: Wed, 23 Feb 2011 12:03:09 +0100 [thread overview]
Message-ID: <1298458989.2217.361.camel@twins> (raw)
In-Reply-To: <1298408674-3130-3-git-send-email-dvhart@linux.intel.com>
On Tue, 2011-02-22 at 13:04 -0800, Darren Hart wrote:
> As it stands, users with rtprio rlimit permissions can change their policy from
> SCHED_OTHER to SCHED_FIFO and back. They can change to SCHED_IDLE, but not back
> to SCHED_FIFO. If they have the rtprio permission, they should be able to. Once
> in SCHED_FIFO, they could go back to SCHED_OTHER. This patch allows users with
> rtprio permission to change out of SCHED_IDLE.
>
Ingo, can you remember the rationale for this?
The fact is that SCHED_IDLE is very near nice-20, and we can do:
peterz@twins:~$ renice 5 -p $$
1867: old priority 0, new priority 5
peterz@twins:~$ renice 0 -p $$
1867: old priority 5, new priority 0
Which would suggest that we should be able to return to SCHED_OTHER
RLIMIT_NICE-20.
Hmm?
next prev parent reply other threads:[~2011-02-23 11:03 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-22 21:04 [PATCH 0/2] sched: SCHED_BATCH fixes Darren Hart
2011-02-22 21:04 ` [PATCH 1/2] sched: allow SCHED_BATCH to preempt SCHED_IDLE tasks Darren Hart
2011-02-23 4:20 ` Mike Galbraith
2011-02-23 5:31 ` Mike Galbraith
2011-02-23 5:33 ` Darren Hart
2011-03-04 11:49 ` [tip:sched/core] sched: Allow " tip-bot for Darren Hart
2011-02-22 21:04 ` [PATCH 2/2] sched: allow users with rtprio rlimit to change from SCHED_IDLE policy Darren Hart
2011-02-23 11:03 ` Peter Zijlstra [this message]
2011-02-23 11:13 ` Ingo Molnar
2011-02-23 11:17 ` Peter Zijlstra
2011-02-23 11:35 ` Ingo Molnar
2011-02-23 15:52 ` Darren Hart
2011-02-23 16:00 ` Peter Zijlstra
2011-02-23 16:07 ` Darren Hart
2011-02-23 21:28 ` Darren Hart
2011-02-24 11:49 ` Peter Zijlstra
2011-03-04 11:49 ` [tip:sched/core] sched: Allow users with sufficient RLIMIT_NICE " tip-bot for Darren Hart
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1298458989.2217.361.camel@twins \
--to=peterz@infradead.org \
--cc=dvhart@linux.intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=richard.purdie@linuxfoundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox