From: Mike Galbraith <efault@gmx.de>
To: Vlastimil Babka <vbabka@suse.cz>,
Thomas Gleixner <tglx@linutronix.de>,
LKML <linux-kernel@vger.kernel.org>
Cc: linux-rt-users@vger.kernel.org,
Mel Gorman <mgorman@techsingularity.net>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Subject: Re: [rfc/patch] mm/slub: restore/expand unfreeze_partials() local exclusion scope
Date: Mon, 26 Jul 2021 12:04:23 +0200 [thread overview]
Message-ID: <86ead66e34c5c3a59b0bf773ed40767b4282b768.camel@gmx.de> (raw)
In-Reply-To: <b41fa4f2-8368-f33a-10c2-68554b16eb1e@suse.cz>
On Sun, 2021-07-25 at 21:34 +0200, Vlastimil Babka wrote:
> On 7/25/21 9:12 PM, Vlastimil Babka wrote:
> > + /*
> > + * On !RT we just want to disable preemption, on RT we need
> > the lock
> > + * for real. This happens to match local_lock() semantics.
> > + */
> > + local_lock(&s->cpu_slab->lock);
>
> OK I realized (and tglx confirmed) that this will blow up on !RT +
> lockdep if interrupted by ___slab_alloc() that will do
> local_lock_irqsave(). So back to #ifdefs it is. But should work as-is
> for RT testing.
I called it off after 3 1/2 hours. Bug blew box outta the water 10
times in about half of that, so methinks it's safe to call it dead.
-Mike
next prev parent reply other threads:[~2021-07-26 10:04 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-08 9:42 [ANNOUNCE] v5.13-rt1 Thomas Gleixner
2021-07-09 5:20 ` [patch] mm/slub: Fix kmem_cache_alloc_bulk() error path Mike Galbraith
2021-07-09 5:20 ` [patch] mm/slub: Replace do_slab_free() local_lock_irqsave/restore() calls in PREEMPT_RT scope Mike Galbraith
2021-07-09 5:21 ` [rfc/patch] mm/slub: restore/expand unfreeze_partials() local exclusion scope Mike Galbraith
2021-07-09 5:25 ` Mike Galbraith
2021-07-09 19:28 ` Thomas Gleixner
2021-07-10 1:12 ` Mike Galbraith
2021-07-15 16:34 ` Mike Galbraith
2021-07-17 14:58 ` [patch] v2 " Mike Galbraith
2021-07-18 7:58 ` Vlastimil Babka
2021-07-18 8:11 ` Mike Galbraith
2021-07-18 15:43 ` Mike Galbraith
2021-07-18 21:19 ` Vlastimil Babka
2021-07-19 4:01 ` Mike Galbraith
2021-07-19 13:15 ` Mike Galbraith
2021-07-20 2:46 ` kernel test robot
2021-07-20 8:56 ` [rfc/patch] " Vlastimil Babka
2021-07-20 11:26 ` Mike Galbraith
2021-07-21 4:56 ` Mike Galbraith
2021-07-21 8:44 ` Vlastimil Babka
2021-07-21 9:33 ` Mike Galbraith
2021-07-23 22:39 ` Vlastimil Babka
2021-07-24 2:25 ` Mike Galbraith
2021-07-25 14:09 ` Mike Galbraith
2021-07-25 14:16 ` Vlastimil Babka
2021-07-25 15:02 ` Mike Galbraith
2021-07-25 16:27 ` Vlastimil Babka
2021-07-25 19:12 ` Vlastimil Babka
2021-07-25 19:34 ` Vlastimil Babka
2021-07-26 10:04 ` Mike Galbraith [this message]
2021-07-26 17:00 ` Mike Galbraith
2021-07-26 21:26 ` Vlastimil Babka
2021-07-27 4:09 ` Mike Galbraith
2021-07-28 16:59 ` Vlastimil Babka
2021-07-29 4:51 ` Mike Galbraith
2021-07-29 9:51 ` Vlastimil Babka
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