From: Mike Galbraith <efault@gmx.de>
To: Chris Metcalf <cmetcalf@mellanox.com>,
Frederic Weisbecker <fweisbec@gmail.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Luiz Capitulino <lcapitulino@redhat.com>,
Christoph Lameter <cl@linux.com>,
"Paul E . McKenney" <paulmck@linux.vnet.ibm.com>,
Ingo Molnar <mingo@kernel.org>, Rik van Riel <riel@redhat.com>,
Wanpeng Li <kernellwp@gmail.com>
Subject: Re: [RFC PATCH 0/9] Introduce housekeeping subsystem
Date: Fri, 11 Aug 2017 08:36:28 +0200 [thread overview]
Message-ID: <1502433388.16425.9.camel@gmx.de> (raw)
In-Reply-To: <3398d7d6-74c2-4918-ae3d-aa5a2e3a12dd@mellanox.com>
On Thu, 2017-08-10 at 09:57 -0400, Chris Metcalf wrote:
> On 8/10/2017 8:54 AM, Frederic Weisbecker wrote:
> > But perhaps I should add a new NO_HZ_FULL_BUT_HOUSEKEEPING option.
> > Otherwise we'll change the meaning of NO_HZ_FULL_ALL way too much, to the point
> > that its default behaviour will be the exact opposite of the current one: by default
> > every CPU is housekeeping, so NO_HZ_FULL_ALL would have no effect anymore if we
> > don't set housekeeping boot option.
>
> Maybe a CONFIG_HOUSEKEEPING_BOOT_ONLY as a way to restrict housekeeping
> by default to just the boot cpu. In conjunction with NOHZ_FULL_ALL you would
> then get the expected semantics.
A big box with only the boot cpu for housekeeping is likely screwed.
Personally, I think NOHZ_FULL_ALL should just die.
-Mike
next prev parent reply other threads:[~2017-08-11 6:37 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-21 13:21 [RFC PATCH 0/9] Introduce housekeeping subsystem Frederic Weisbecker
2017-07-21 13:21 ` [RFC PATCH 1/9] housekeeping: Move housekeeping related code to its own file Frederic Weisbecker
2017-07-21 13:21 ` [RFC PATCH 2/9] watchdog: Use housekeeping_cpumask() instead of ad-hoc version Frederic Weisbecker
2017-07-21 13:21 ` [RFC PATCH 3/9] housekeeping: Provide a dynamic off-case to housekeeping_any_cpu() Frederic Weisbecker
2017-07-21 13:21 ` [RFC PATCH 4/9] housekeeping: Make housekeeping cpumask private Frederic Weisbecker
2017-07-21 13:21 ` [RFC PATCH 5/9] housekeeping: Use its own static key Frederic Weisbecker
2017-07-21 13:21 ` [RFC PATCH 6/9] housekeeping: Rename is_housekeeping_cpu to housekeeping_cpu Frederic Weisbecker
2017-07-21 13:21 ` [RFC PATCH 7/9] housekeeping: Use own boot option, independant from nohz Frederic Weisbecker
2017-08-11 19:09 ` Luiz Capitulino
2017-08-12 14:10 ` Frederic Weisbecker
2017-08-13 15:13 ` Luiz Capitulino
2017-08-14 17:01 ` Frederic Weisbecker
2017-08-14 17:34 ` Luiz Capitulino
2017-08-14 18:29 ` Mike Galbraith
2017-08-15 13:07 ` Frederic Weisbecker
2017-08-15 15:15 ` Mike Galbraith
2017-08-15 15:30 ` Paul E. McKenney
2017-08-15 15:52 ` Christopher Lameter
2017-08-15 15:57 ` Mike Galbraith
2017-08-15 16:26 ` Christopher Lameter
2017-08-16 18:00 ` Mike Galbraith
2017-08-15 15:53 ` Mike Galbraith
2017-07-21 13:21 ` [RFC PATCH 8/9] housekeeping: Move it under own config, independant from NO_HZ Frederic Weisbecker
2017-07-21 13:21 ` [RFC PATCH 9/9] workqueue: Affine unbound workqueues to housekeeping cpumask Frederic Weisbecker
2017-07-21 19:48 ` [RFC PATCH 0/9] Introduce housekeeping subsystem Chris Metcalf
2017-08-10 12:54 ` Frederic Weisbecker
2017-08-10 13:57 ` Chris Metcalf
2017-08-11 6:36 ` Mike Galbraith [this message]
2017-08-11 15:01 ` Frederic Weisbecker
2017-08-11 19:22 ` Luiz Capitulino
2017-08-11 15:08 ` Chris Metcalf
2017-08-11 15:35 ` Christopher Lameter
2017-08-11 15:50 ` Chris Metcalf
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