From: Hillf Danton <hdanton@sina.com>
To: Marco Elver <elver@google.com>
Cc: akpm@linux-foundation.org, glider@google.com, dvyukov@google.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
kasan-dev@googlegroups.com, Mel Gorman <mgorman@suse.de>,
stable@vger.kernel.org
Subject: Re: [PATCH] kfence: use TASK_IDLE when awaiting allocation
Date: Fri, 21 May 2021 17:37:15 +0800 [thread overview]
Message-ID: <20210521093715.1813-1-hdanton@sina.com> (raw)
In-Reply-To: <20210521083209.3740269-1-elver@google.com>
On Fri, 21 May 2021 10:32:09 +0200 Marco Elver wrote:
>Since wait_event() uses TASK_UNINTERRUPTIBLE by default, waiting for an
>allocation counts towards load. However, for KFENCE, this does not make
>any sense, since there is no busy work we're awaiting.
Because of a blocking wq callback, kfence_timer should be queued on a
unbound workqueue in the first place. Feel free to add a followup to
replace system_power_efficient_wq with system_unbound_wq if it makes
sense to you that kfence behaves as correctly as expected independent of
CONFIG_WQ_POWER_EFFICIENT_DEFAULT given "system_power_efficient_wq is
identical to system_wq if 'wq_power_efficient' is disabled."
next prev parent reply other threads:[~2021-05-21 9:37 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-21 8:32 [PATCH] kfence: use TASK_IDLE when awaiting allocation Marco Elver
2021-05-21 9:37 ` Hillf Danton [this message]
2021-05-21 11:17 ` Marco Elver
2021-05-21 9:39 ` David Laight
2021-05-21 9:47 ` Marco Elver
2021-05-21 10:15 ` David Laight
2021-06-07 14:23 ` [5.12.y] " Marco Elver
2021-06-08 13:21 ` Greg Kroah-Hartman
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