From: Will Huck <will.huckk@gmail.com>
To: Hugh Dickins <hughd@google.com>
Cc: Greg Thelen <gthelen@google.com>,
akpm@linux-foundation.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] tmpfs: fix mempolicy object leaks
Date: Thu, 07 Mar 2013 14:41:29 +0800 [thread overview]
Message-ID: <51383699.7060805@gmail.com> (raw)
In-Reply-To: <alpine.LNX.2.00.1303051101350.27525@eggly.anvils>
Hi Hugh,
On 03/06/2013 03:40 AM, Hugh Dickins wrote:
> On Mon, 4 Mar 2013, Will Huck wrote:
>> Could you explain me why shmem has more relationship with mempolicy? It seems
>> that there are many codes in shmem handle mempolicy, but other components in
>> mm subsystem just have little.
> NUMA mempolicy is mostly handled in mm/mempolicy.c, which services the
> mbind, migrate_pages, set_mempolicy, get_mempolicy system calls: which
> govern how process memory is distributed across NUMA nodes.
>
> mm/shmem.c is affected because it was also found useful to specify
> mempolicy on the shared memory objects which may back process memory:
> that includes SysV SHM and POSIX shared memory and tmpfs. mm/hugetlb.c
> contains some mempolicy handling for hugetlbfs; fs/ramfs is kept minimal,
> so nothing in there.
>
> Those are the memory-based filesystems, where NUMA mempolicy is most
> natural. The regular filesystems could support shared mempolicy too,
> but that would raise more awkward design questions.
I found that if mbind several processes to one node and almost exhaust
memory, processes will just stuck and no processes make progress or be
killed. Is it normal?
>
> Hugh
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next prev parent reply other threads:[~2013-03-07 6:41 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-20 7:11 [PATCH 1/2] tmpfs: fix use-after-free of mempolicy object Greg Thelen
2013-02-20 7:11 ` [PATCH 2/2] tmpfs: fix mempolicy object leaks Greg Thelen
2013-02-20 20:26 ` Hugh Dickins
2013-02-20 21:06 ` Andrew Morton
2013-03-03 23:49 ` Will Huck
2013-03-05 19:40 ` Hugh Dickins
2013-03-07 6:41 ` Will Huck [this message]
2013-02-20 20:21 ` [PATCH 1/2] tmpfs: fix use-after-free of mempolicy object Hugh Dickins
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