From: Christopher Lameter <cl@linux.com>
To: Shakeel Butt <shakeelb@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>,
Vladimir Davydov <vdavydov.dev@gmail.com>,
Alexander Potapenko <glider@google.com>,
Greg Thelen <gthelen@google.com>,
Dmitry Vyukov <dvyukov@google.com>,
Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] slab, slub: skip unnecessary kasan_cache_shutdown()
Date: Wed, 28 Mar 2018 17:00:46 -0500 (CDT) [thread overview]
Message-ID: <alpine.DEB.2.20.1803281700230.23247@nuc-kabylake> (raw)
In-Reply-To: <20180327230603.54721-1-shakeelb@google.com>
On Tue, 27 Mar 2018, Shakeel Butt wrote:
> The kasan quarantine is designed to delay freeing slab objects to catch
> use-after-free. The quarantine can be large (several percent of machine
> memory size). When kmem_caches are deleted related objects are flushed
> from the quarantine but this requires scanning the entire quarantine
> which can be very slow. We have seen the kernel busily working on this
> while holding slab_mutex and badly affecting cache_reaper, slabinfo
> readers and memcg kmem cache creations.
Acked-by: Christoph Lameter <cl@linux.com>
prev parent reply other threads:[~2018-03-28 22:00 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-27 23:06 Shakeel Butt
2018-03-28 0:16 ` David Rientjes
2018-03-28 5:41 ` Shakeel Butt
2018-03-28 21:29 ` David Rientjes
2018-03-28 17:03 ` Andrey Ryabinin
2018-03-28 22:00 ` Christopher Lameter [this message]
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