From: Christoph Lameter <cl@linux.com>
To: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Markos Chandras <Markos.Chandras@imgtec.com>,
linux-mips@linux-mips.org
Subject: Re: [PATCH for v3.18] mm/slab: fix unalignment problem on Malta with EVA due to slab merge
Date: Fri, 31 Oct 2014 10:17:16 -0500 (CDT) [thread overview]
Message-ID: <alpine.DEB.2.11.1410311015490.14859@gentwo.org> (raw)
In-Reply-To: <1414742912-14852-1-git-send-email-iamjoonsoo.kim@lge.com>
On Fri, 31 Oct 2014, Joonsoo Kim wrote:
> alloc_unbound_pwq() allocates slab object from pool_workqueue. This
> kmem_cache requires 256 bytes alignment, but, current merging code
> doesn't honor that, and merge it with kmalloc-256. kmalloc-256 requires
> only cacheline size alignment so that above failure occurs. However,
> in x86, kmalloc-256 is luckily aligned in 256 bytes, so the problem
> didn't happen on it.
That luck will run out when you enable debugging. But then that also
usually means disablign merging.
> To fix this problem, this patch introduces alignment mismatch check
> in find_mergeable(). This will fix the problem.
Acked-by: Christoph Lameter <cl@linux.com>
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prev parent reply other threads:[~2014-10-31 15:58 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-31 8:08 Joonsoo Kim
2014-10-31 15:17 ` Christoph Lameter [this message]
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