From: ebiederm@xmission.com (Eric W. Biederman)
To: "Martin J. Bligh" <mbligh@aracnet.com>
Cc: William Lee Irwin III <wli@holomorphy.com>,
Andrew Morton <akpm@digeo.com>,
davem@redhat.com, rohit.seth@intel.com, davidm@napali.hpl.hp.com,
anton@samba.org, linux-mm@kvack.org
Subject: Re: hugepage patches
Date: 05 Feb 2003 05:18:35 -0700 [thread overview]
Message-ID: <m1vfzyzzs4.fsf@frodo.biederman.org> (raw)
In-Reply-To: <174080000.1044374131@[10.10.2.4]>
"Martin J. Bligh" <mbligh@aracnet.com> writes:
> > Did I misunderstand what was meant by a massively shared mapping?
> >
> > I can't imagine it being useful to guys like oracle without MAP_SHARED
> > support....
>
> Create a huge shmem segment. and don't share the pagetables. Without large
> pages, it's an enormous waste of space in mindless duplication. With large
> pages, it's a much smaller waste of space (no PTEs) in mindless
> duplication.
> Still not optimal, but makes the problem manageable.
And this is exactly the mmap(MAP_SHARED) case. Where a single memory
segment is shared between multiple mm's.
Eric
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next prev parent reply other threads:[~2003-02-05 12:18 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-31 23:15 hugepage patches Andrew Morton
2003-01-31 23:13 ` David S. Miller
2003-01-31 23:36 ` Andrew Morton
2003-01-31 23:23 ` David S. Miller
2003-01-31 23:45 ` Andrew Morton
2003-01-31 23:48 ` David S. Miller
2003-01-31 23:16 ` Andrew Morton
2003-01-31 23:17 ` Andrew Morton
2003-01-31 23:18 ` Andrew Morton
2003-01-31 23:18 ` Andrew Morton
2003-02-01 8:58 ` Ingo Oeser
2003-02-01 9:31 ` Andrew Morton
2003-02-01 10:00 ` William Lee Irwin III
2003-02-01 10:14 ` Andrew Morton
2003-02-02 10:55 ` Andrew Morton
2003-02-02 10:55 ` Andrew Morton
2003-02-02 19:59 ` William Lee Irwin III
2003-02-02 20:49 ` Andrew Morton
2003-02-03 15:09 ` Eric W. Biederman
2003-02-03 21:29 ` Andrew Morton
2003-02-04 5:37 ` Eric W. Biederman
2003-02-04 5:50 ` William Lee Irwin III
2003-02-04 7:06 ` Eric W. Biederman
2003-02-04 7:16 ` Martin J. Bligh
2003-02-04 12:40 ` Eric W. Biederman
2003-02-04 15:55 ` Martin J. Bligh
2003-02-05 12:18 ` Eric W. Biederman [this message]
2003-02-04 21:12 ` Andrew Morton
2003-02-05 12:25 ` Eric W. Biederman
2003-02-05 19:57 ` Andrew Morton
2003-02-05 20:00 ` Andrew Morton
2003-02-02 10:55 ` Andrew Morton
2003-02-02 10:56 ` Andrew Morton
2003-02-02 20:06 ` William Lee Irwin III
2003-02-02 10:56 ` Andrew Morton
2003-02-02 10:56 ` Andrew Morton
2003-02-02 10:57 ` Andrew Morton
2003-02-02 10:57 ` Andrew Morton
2003-02-02 20:17 ` William Lee Irwin III
2003-02-02 10:57 ` Andrew Morton
-- strict thread matches above, loose matches on Subject: below --
2003-02-07 21:49 Seth, Rohit
2003-02-07 22:00 ` Andrew Morton
2003-02-07 22:02 Seth, Rohit
2003-02-07 22:24 ` Andrew Morton
2003-02-08 1:47 Seth, Rohit
2003-02-08 2:02 ` Andrew Morton
2003-02-08 3:05 Seth, Rohit
2003-02-08 8:48 ` Andrew Morton
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