linux-kernel - Re: [RFC] mm, slab: reschedule cache

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Message-ID: <20180410202353.GB793541@devbig577.frc2.facebook.com>
Date:   Tue, 10 Apr 2018 13:23:53 -0700
From:   Tejun Heo <tj@...nel.org>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     Christopher Lameter <cl@...ux.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Joonsoo Kim <iamjoonsoo.kim@....com>,
        David Rientjes <rientjes@...gle.com>,
        Pekka Enberg <penberg@...nel.org>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Stephen Boyd <sboyd@...nel.org>
Subject: Re: [RFC] mm, slab: reschedule cache_reap() on the same CPU

Hello,

On Tue, Apr 10, 2018 at 10:13:33PM +0200, Vlastimil Babka wrote:
> > For percpu work items, they'll keep executing on the same cpu it
> > started on unless the cpu goes down while executing.
> 
> Right, but before this patch, with just schedule_delayed_work() i.e.
> non-percpu? If such work can migrate in the middle, the slab bug is
> potentially much more serious.

That's still per-cpu.  The only time the local binding breaks is when
the kernel is explicitly told to do so through explicit unbound_mask
or force_rr debug option.

Thanks.

-- 
tejun