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From: Joonsoo Kim <iamjoonsoo.kim@lge.com>
To: Doug Smythies <dsmythies@telus.net>
Cc: 'Johannes Weiner' <hannes@cmpxchg.org>,
	'Andrew Morton' <akpm@linux-foundation.org>,
	'Vladimir Davydov' <vdavydov.dev@gmail.com>,
	bugzilla-daemon@bugzilla.kernel.org, linux-mm@kvack.org
Subject: Re: [Bug 172981] New: [bisected] SLAB: extreme load averages and over 2000 kworker threads
Date: Wed, 28 Sep 2016 14:18:42 +0900	[thread overview]
Message-ID: <20160928051841.GB22706@js1304-P5Q-DELUXE> (raw)
In-Reply-To: <002a01d21936$5ca792a0$15f6b7e0$@net>

On Tue, Sep 27, 2016 at 08:13:58PM -0700, Doug Smythies wrote:
> By the way, I can eliminate the problem by doing this:
> (see also: https://bugzilla.kernel.org/show_bug.cgi?id=172991)

I think that Johannes found the root cause of the problem and they
(Johannes and Vladimir) will solve the root cause.

However, there is something useful to do in SLAB side.
Could you test following patch, please?

Thanks.

---------->8--------------
diff --git a/mm/slab.c b/mm/slab.c
index 0eb6691..39e3bf2 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -965,7 +965,7 @@ static int setup_kmem_cache_node(struct kmem_cache *cachep,
         * guaranteed to be valid until irq is re-enabled, because it will be
         * freed after synchronize_sched().
         */
-       if (force_change)
+       if (n->shared && force_change)
                synchronize_sched();
 
 fail:

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  reply	other threads:[~2016-09-28  5:10 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <bug-172981-27@https.bugzilla.kernel.org/>
2016-09-27 18:10 ` [Bug 172981] New: [bisected] SLAB: extreme load averages and over 2000 kworker threads Andrew Morton
2016-09-28  2:03   ` Johannes Weiner
2016-09-28  8:09     ` Vladimir Davydov
2016-09-29  2:00       ` Joonsoo Kim
2016-09-29 13:45         ` Vladimir Davydov
2016-09-30  8:19           ` Joonsoo Kim
2016-09-30 19:58             ` Vladimir Davydov
2016-10-06  5:04             ` Doug Smythies
2016-10-06  6:35               ` Joonsoo Kim
2016-10-06 16:02               ` Doug Smythies
2016-10-07 15:55               ` Doug Smythies
2016-09-28  3:13   ` Doug Smythies
2016-09-28  5:18     ` Joonsoo Kim [this message]
2016-09-28  6:20       ` Joonsoo Kim
2016-09-28 15:22       ` Doug Smythies
2016-09-29  1:50         ` Joonsoo Kim

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