From: Sasha Levin <sasha.levin@oracle.com>
To: Hugh Dickins <hughd@google.com>, Dave Jones <davej@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: mm: shm: hang in shmem_fallocate
Date: Sun, 09 Feb 2014 20:41:54 -0500 [thread overview]
Message-ID: <52F82E62.2010709@oracle.com> (raw)
In-Reply-To: <alpine.LSU.2.11.1402081841160.26825@eggly.anvils>
On 02/08/2014 10:25 PM, Hugh Dickins wrote:
> Would trinity be likely to have a thread or process repeatedly faulting
> in pages from the hole while it is being punched?
I can see how trinity would do that, but just to be certain - Cc davej.
On 02/08/2014 10:25 PM, Hugh Dickins wrote:
> Does this happen with other holepunch filesystems? If it does not,
> I'd suppose it's because the tmpfs fault-in-newly-created-page path
> is lighter than a consistent disk-based filesystem's has to be.
> But we don't want to make the tmpfs path heavier to match them.
No, this is strictly limited to tmpfs, and AFAIK trinity tests hole
punching in other filesystems and I make sure to get a bunch of those
mounted before starting testing.
Thanks,
Sasha
WARNING: multiple messages have this Message-ID (diff)
From: Sasha Levin <sasha.levin@oracle.com>
To: Hugh Dickins <hughd@google.com>, Dave Jones <davej@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: mm: shm: hang in shmem_fallocate
Date: Sun, 09 Feb 2014 20:41:54 -0500 [thread overview]
Message-ID: <52F82E62.2010709@oracle.com> (raw)
In-Reply-To: <alpine.LSU.2.11.1402081841160.26825@eggly.anvils>
On 02/08/2014 10:25 PM, Hugh Dickins wrote:
> Would trinity be likely to have a thread or process repeatedly faulting
> in pages from the hole while it is being punched?
I can see how trinity would do that, but just to be certain - Cc davej.
On 02/08/2014 10:25 PM, Hugh Dickins wrote:
> Does this happen with other holepunch filesystems? If it does not,
> I'd suppose it's because the tmpfs fault-in-newly-created-page path
> is lighter than a consistent disk-based filesystem's has to be.
> But we don't want to make the tmpfs path heavier to match them.
No, this is strictly limited to tmpfs, and AFAIK trinity tests hole
punching in other filesystems and I make sure to get a bunch of those
mounted before starting testing.
Thanks,
Sasha
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next prev parent reply other threads:[~2014-02-10 1:42 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-16 4:01 mm: shm: hang in shmem_fallocate Sasha Levin
2013-12-16 4:01 ` Sasha Levin
2014-02-08 19:46 ` Sasha Levin
2014-02-08 19:46 ` Sasha Levin
2014-02-09 3:25 ` Hugh Dickins
2014-02-09 3:25 ` Hugh Dickins
2014-02-10 1:41 ` Sasha Levin [this message]
2014-02-10 1:41 ` Sasha Levin
2014-06-12 20:38 ` Sasha Levin
2014-06-12 20:38 ` Sasha Levin
2014-06-16 2:29 ` Hugh Dickins
2014-06-16 2:29 ` Hugh Dickins
2014-06-17 20:32 ` Sasha Levin
2014-06-17 20:32 ` Sasha Levin
2014-06-24 16:31 ` Vlastimil Babka
2014-06-24 16:31 ` Vlastimil Babka
2014-06-25 22:36 ` Hugh Dickins
2014-06-25 22:36 ` Hugh Dickins
2014-06-26 9:14 ` Vlastimil Babka
2014-06-26 9:14 ` Vlastimil Babka
2014-06-26 15:19 ` Vlastimil Babka
2014-06-26 15:19 ` Vlastimil Babka
2014-06-27 5:36 ` Hugh Dickins
2014-06-27 5:36 ` Hugh Dickins
2014-07-01 11:52 ` Vlastimil Babka
2014-07-01 11:52 ` Vlastimil Babka
2014-07-02 1:49 ` Hugh Dickins
2014-07-02 1:49 ` Hugh Dickins
2014-07-09 21:59 ` Johannes Weiner
2014-07-09 21:59 ` Johannes Weiner
2014-07-09 22:48 ` Hugh Dickins
2014-07-09 22:48 ` Hugh Dickins
2014-07-10 0:51 ` Hugh Dickins
2014-07-10 0:51 ` Hugh Dickins
2014-06-26 15:11 ` Sasha Levin
2014-06-27 5:59 ` Hugh Dickins
2014-06-27 5:59 ` Hugh Dickins
2014-06-27 14:50 ` Sasha Levin
2014-06-27 14:50 ` Sasha Levin
2014-06-27 18:03 ` Hugh Dickins
2014-06-27 18:03 ` Hugh Dickins
2014-06-28 21:41 ` Sasha Levin
2014-06-28 21:41 ` Sasha Levin
2014-07-01 22:37 ` mm: shmem: hang in shmem_fault (WAS: mm: shm: hang in shmem_fallocate) Sasha Levin
2014-07-01 22:37 ` Sasha Levin
2014-07-02 0:17 ` Hugh Dickins
2014-07-02 0:17 ` Hugh Dickins
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