From: Peter Zijlstra <peterz@infradead.org>
To: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Christoph Lameter <cl@linux.com>,
Andrew Morton <akpm@linux-foundation.org>,
Gilad Ben-Yossef <gilad@benyossef.com>,
Thomas Gleixner <tglx@linutronix.de>,
Mike Frysinger <vapier@gentoo.org>,
linux-kernel@vger.kernel.org,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Ingo Molnar <mingo@kernel.org>
Subject: Re: [RFC] Restrict kernel spawning of threads to a specified set of cpus.
Date: Fri, 13 Sep 2013 11:25:53 +0200 [thread overview]
Message-ID: <20130913092553.GL31370@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20130912183023.GA25386@somewhere>
On Thu, Sep 12, 2013 at 08:30:25PM +0200, Frederic Weisbecker wrote:
> Now the issue doesn't only concern kthreads but all tasks in the system.
No, only kernel threads, all other tasks have a parent they inherit
(namespace, cgroup, affinity etc..) context from.
> If we really want to solve that race, then may be we can think of a kernel_parameter
No bloody kernel params. I'd much rather create a pointless kthread to
act as usermodehelper parent that people can set context on (move it
into cgroups, set affinity, whatever) so it automagically propagates to
all userspace helper thingies.
Is there anything other than usermodehelper we need to be concerned
with? One that comes to mind would be unbound workqueue threads. Do we
want to share the parent with usermodehelpers or have these two classes
have different parents?
next prev parent reply other threads:[~2013-09-13 9:26 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-05 20:07 [RFC] Restrict kernel spawning of threads to a specified set of cpus Christoph Lameter
2013-09-10 6:05 ` Gilad Ben-Yossef
2013-09-10 6:47 ` Mike Galbraith
2013-09-10 6:59 ` Gilad Ben-Yossef
2013-09-10 7:26 ` Mike Galbraith
2013-09-10 7:56 ` Gilad Ben-Yossef
2013-09-10 8:53 ` Mike Galbraith
2013-09-10 21:10 ` Christoph Lameter
2013-09-11 3:20 ` Mike Galbraith
2013-09-11 14:21 ` Christoph Lameter
2013-09-11 14:53 ` Mike Galbraith
2013-09-11 16:56 ` Christoph Lameter
2013-09-11 21:36 ` Frederic Weisbecker
2013-09-12 3:30 ` Mike Galbraith
2013-09-10 21:08 ` Christoph Lameter
2013-09-10 7:39 ` Rob Landley
2013-09-10 21:11 ` Christoph Lameter
2013-09-11 22:02 ` Frederic Weisbecker
2013-09-12 14:10 ` Christoph Lameter
2013-09-12 14:16 ` Frederic Weisbecker
2013-09-12 14:22 ` Christoph Lameter
2013-09-12 14:31 ` Frederic Weisbecker
2013-09-12 14:52 ` Christoph Lameter
2013-09-12 15:11 ` Frederic Weisbecker
2013-09-12 15:32 ` Christoph Lameter
2013-09-12 18:45 ` Frederic Weisbecker
2013-09-12 15:39 ` Paul E. McKenney
2013-09-12 18:35 ` Frederic Weisbecker
2013-09-12 18:51 ` Paul E. McKenney
2013-09-15 13:53 ` Gilad Ben-Yossef
[not found] ` <alpine.DEB.2.02.1309121030390.21473@gentwo.org>
2013-09-12 15:42 ` Christoph Lameter
2013-09-12 18:30 ` Frederic Weisbecker
2013-09-13 9:25 ` Peter Zijlstra [this message]
2013-09-13 13:54 ` Christoph Lameter
2013-09-13 14:40 ` Peter Zijlstra
2013-09-13 15:15 ` Christoph Lameter
[not found] ` <alpine.DEB.2.02.1309131010480.26487@gentwo.org>
2013-09-13 15:40 ` Christoph Lameter
2013-09-16 6:02 ` Peter Zijlstra
2013-09-13 13:45 ` Christoph Lameter
2013-09-13 14:04 ` Frederic Weisbecker
2013-09-13 14:25 ` Christoph Lameter
2013-09-15 13:47 ` Gilad Ben-Yossef
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