From: "Martin J. Bligh" <mbligh@aracnet.com>
To: Brent Casavant <bcasavan@sgi.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Cc: hugh@veritas.com, ak@suse.de
Subject: Re: [PATCH] Use MPOL_INTERLEAVE for tmpfs files
Date: Tue, 02 Nov 2004 07:46:59 -0800 [thread overview]
Message-ID: <14340000.1099410418@[10.10.2.4]> (raw)
In-Reply-To: <Pine.SGI.4.58.0411011901540.77038@kzerza.americas.sgi.com>
> This patch causes memory allocation for tmpfs files to be distributed
> evenly across NUMA machines. In most circumstances today, tmpfs files
> will be allocated on the same node as the task writing to the file.
> In many cases, particularly when large files are created, or a large
> number of files are created by a single task, this leads to a severe
> imbalance in free memory amongst nodes. This patch corrects that
> situation.
Yeah, but it also ruins your locality of reference (in a NUMA sense).
Not convinced that's a good idea. You're guaranteeing universally consistent
worse-case performance for everyone. And you're only looking at a situation
where there's one allocator on the system, and that's imbalanced.
You WANT your data to be local. That's the whole idea.
M.
WARNING: multiple messages have this Message-ID (diff)
From: "Martin J. Bligh" <mbligh@aracnet.com>
To: Brent Casavant <bcasavan@sgi.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Cc: hugh@veritas.com, ak@suse.de
Subject: Re: [PATCH] Use MPOL_INTERLEAVE for tmpfs files
Date: Tue, 02 Nov 2004 07:46:59 -0800 [thread overview]
Message-ID: <14340000.1099410418@[10.10.2.4]> (raw)
In-Reply-To: <Pine.SGI.4.58.0411011901540.77038@kzerza.americas.sgi.com>
> This patch causes memory allocation for tmpfs files to be distributed
> evenly across NUMA machines. In most circumstances today, tmpfs files
> will be allocated on the same node as the task writing to the file.
> In many cases, particularly when large files are created, or a large
> number of files are created by a single task, this leads to a severe
> imbalance in free memory amongst nodes. This patch corrects that
> situation.
Yeah, but it also ruins your locality of reference (in a NUMA sense).
Not convinced that's a good idea. You're guaranteeing universally consistent
worse-case performance for everyone. And you're only looking at a situation
where there's one allocator on the system, and that's imbalanced.
You WANT your data to be local. That's the whole idea.
M.
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next prev parent reply other threads:[~2004-11-02 15:57 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-02 1:07 [PATCH] Use MPOL_INTERLEAVE for tmpfs files Brent Casavant
2004-11-02 1:07 ` Brent Casavant
2004-11-02 1:43 ` Dave Hansen
2004-11-02 1:43 ` Dave Hansen
2004-11-02 9:13 ` Andi Kleen
2004-11-02 9:13 ` Andi Kleen
2004-11-02 15:46 ` Martin J. Bligh [this message]
2004-11-02 15:46 ` Martin J. Bligh
2004-11-02 15:55 ` Andi Kleen
2004-11-02 15:55 ` Andi Kleen
2004-11-02 16:55 ` Martin J. Bligh
2004-11-02 16:55 ` Martin J. Bligh
2004-11-02 22:17 ` Brent Casavant
2004-11-02 22:17 ` Brent Casavant
2004-11-02 22:51 ` Martin J. Bligh
2004-11-02 22:51 ` Martin J. Bligh
2004-11-03 1:12 ` Brent Casavant
2004-11-03 1:12 ` Brent Casavant
2004-11-03 1:30 ` Martin J. Bligh
2004-11-03 8:44 ` Hugh Dickins
2004-11-03 8:44 ` Hugh Dickins
2004-11-03 9:01 ` Andi Kleen
2004-11-03 9:01 ` Andi Kleen
2004-11-03 16:32 ` Brent Casavant
2004-11-03 16:32 ` Brent Casavant
2004-11-03 21:00 ` Martin J. Bligh
2004-11-03 21:00 ` Martin J. Bligh
2004-11-08 19:58 ` Brent Casavant
2004-11-08 19:58 ` Brent Casavant
2004-11-08 20:57 ` Martin J. Bligh
2004-11-08 20:57 ` Martin J. Bligh
2004-11-09 19:04 ` Hugh Dickins
2004-11-09 19:04 ` Hugh Dickins
2004-11-09 20:09 ` Martin J. Bligh
2004-11-09 20:09 ` Martin J. Bligh
2004-11-09 21:08 ` Hugh Dickins
2004-11-09 21:08 ` Hugh Dickins
2004-11-09 22:07 ` Martin J. Bligh
2004-11-09 22:07 ` Martin J. Bligh
2004-11-10 2:41 ` Brent Casavant
2004-11-10 2:41 ` Brent Casavant
2004-11-10 14:20 ` Hugh Dickins
2004-11-10 14:20 ` Hugh Dickins
2004-11-11 19:48 ` Hugh Dickins
2004-11-11 19:48 ` Hugh Dickins
2004-11-11 23:10 ` Brent Casavant
2004-11-11 23:10 ` Brent Casavant
2004-11-15 22:07 ` Brent Casavant
2004-11-15 22:07 ` Brent Casavant
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