From: Andrey Ryabinin <aryabinin@virtuozzo.com>
To: Dmitry Vyukov <dvyukov@google.com>,
linux-mm@kvack.org, akpm@linux-foundation.org
Cc: kasan-dev@googlegroups.com, Greg Thelen <gthelen@google.com>
Subject: Re: [PATCH] kasan: resched in quarantine_remove_cache()
Date: Thu, 9 Mar 2017 11:37:23 +0300 [thread overview]
Message-ID: <8c9ee23c-635d-9b12-efcb-f0233dd508fc@virtuozzo.com> (raw)
In-Reply-To: <20170308154239.25440-1-dvyukov@google.com>
On 03/08/2017 06:42 PM, Dmitry Vyukov wrote:
> We see reported stalls/lockups in quarantine_remove_cache() on machines
> with large amounts of RAM. quarantine_remove_cache() needs to scan whole
> quarantine in order to take out all objects belonging to the cache.
> Quarantine is currently 1/32-th of RAM, e.g. on a machine with 256GB
> of memory that will be 8GB. Moreover quarantine scanning is a walk
> over uncached linked list, which is slow.
>
> Add cond_resched() after scanning of each non-empty batch of objects.
> Batches are specifically kept of reasonable size for quarantine_put().
> On a machine with 256GB of RAM we should have ~512 non-empty batches,
> each with 16MB of objects.
>
> Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
> Cc: kasan-dev@googlegroups.com
> Cc: linux-mm@kvack.org
> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
> Cc: Greg Thelen <gthelen@google.com>
Acked-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
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prev parent reply other threads:[~2017-03-09 8:36 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-08 15:42 Dmitry Vyukov
2017-03-08 23:05 ` Andrew Morton
2017-03-09 8:37 ` Andrey Ryabinin [this message]
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