From: Frederic Weisbecker <fweisbec@gmail.com>
To: Christoph Lameter <cl@linux.com>
Cc: Oleg Nesterov <oleg@redhat.com>,
LKML <linux-kernel@vger.kernel.org>,
Rik van Riel <riel@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH 2/5] kmod: Use system_unbound_wq instead of khelper
Date: Fri, 10 Jul 2015 19:12:11 +0200 [thread overview]
Message-ID: <20150710171208.GA26428@lerouge> (raw)
In-Reply-To: <alpine.DEB.2.11.1507100920200.5980@east.gentwo.org>
On Fri, Jul 10, 2015 at 09:20:46AM -0500, Christoph Lameter wrote:
> On Fri, 10 Jul 2015, Frederic Weisbecker wrote:
>
> > Now perhaps it is a good thing in the end. At least in nohz full it
> > doesn't change anything as we affine that workqueue too. But we must
> > be sure that a single NUMA node is enough to handle typical loads of
> > usermodehelper.
>
> This is configurable right? So if you screw up you are responsible.
No it's not much configurable. The works are scheduled on tasks that are
node affine and you can't change that for system_unbound_wq. Only WQ_SYSFS
workqueues can be overriden on their no_numa property but even there that's
after the boot and most of the usermodehelper load goes on boot.
next prev parent reply other threads:[~2015-07-10 17:12 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-09 18:07 [PATCH 0/5] kmod: Simplifications and cleanups v2 Frederic Weisbecker
2015-07-09 18:07 ` [PATCH 1/5] kmod: Bunch of internal functions renames Frederic Weisbecker
2015-07-09 18:07 ` [PATCH 2/5] kmod: Use system_unbound_wq instead of khelper Frederic Weisbecker
2015-07-09 22:44 ` Oleg Nesterov
2015-07-10 13:47 ` Frederic Weisbecker
2015-07-10 14:20 ` Christoph Lameter
2015-07-10 17:12 ` Frederic Weisbecker [this message]
2015-07-10 17:52 ` Christoph Lameter
2015-07-10 18:10 ` Frederic Weisbecker
2015-07-10 19:05 ` Christoph Lameter
2015-07-14 14:04 ` Frederic Weisbecker
2015-07-09 18:07 ` [PATCH 3/5] kmod: Add up-to-date explanations on the purpose of each asynchronous levels Frederic Weisbecker
2015-07-09 18:07 ` [PATCH 4/5] kmod: Remove unecessary explicit wide CPU affinity setting Frederic Weisbecker
2015-07-09 18:07 ` [RFC PATCH 5/5] kmod: Handle UMH_WAIT_PROC from system unbound workqueue Frederic Weisbecker
2015-07-09 22:51 ` Oleg Nesterov
2015-07-10 13:57 ` Frederic Weisbecker
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