From: Hugh Dickins <hugh@veritas.com>
To: sameer sameer <sameerchakravarthy@yahoo.com>
Cc: linux-mm@kvack.org
Subject: Re: question on mmap
Date: Fri, 13 Apr 2007 18:59:30 +0100 (BST) [thread overview]
Message-ID: <Pine.LNX.4.64.0704131856050.8823@blonde.wat.veritas.com> (raw)
In-Reply-To: <835465.82854.qm@web43140.mail.sp1.yahoo.com>
On Wed, 11 Apr 2007, sameer sameer wrote:
>
> I have a question regarding the implementation of
> mmap. I am trying to find out if we the kernel
> actually shares the memory across unrelated processes
> using MAP_SHARED flag for a read only file mapping.
Yes, it does.
>
> When the file is mapped with PROT_READ arguement, then
> will there be any difference in memory usage by
> multiple processes if the mapping is done using
> MAP_SHARED instead of MAP_PRIVATE ?
No, no difference.
>
> Are there any system commands which will let me know
> how to calcuate the memory savings (if there are any)
No such savings.
Hugh
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next prev parent reply other threads:[~2007-04-13 17:59 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-10 19:19 [SLUB 1/5] Fix object counting Christoph Lameter
2007-04-10 19:19 ` [SLUB 2/5] Enable tracking of full slabs Christoph Lameter
2007-04-10 19:19 ` [SLUB 3/5] Validation of slabs (metadata and guard zones) Christoph Lameter
2007-04-10 20:31 ` Andrew Morton
2007-04-10 20:47 ` Dave Jones
2007-04-10 21:42 ` Andrew Morton
2007-04-10 21:10 ` Christoph Lameter
2007-04-10 21:13 ` Christoph Lameter
2007-04-10 21:14 ` Christoph Lameter
2007-04-10 21:15 ` Christoph Lameter
2007-04-10 21:21 ` Christoph Lameter
2007-04-10 21:40 ` Christoph Lameter
2007-04-10 22:49 ` Christoph Lameter
2007-04-10 23:43 ` Andrew Morton
2007-04-10 23:17 ` Christoph Lameter
2007-04-10 23:38 ` Christoph Lameter
2007-04-11 0:00 ` Christoph Lameter
2007-04-11 0:15 ` Christoph Lameter
2007-04-11 6:24 ` question on mmap sameer sameer
2007-04-13 17:59 ` Hugh Dickins [this message]
2007-04-11 2:24 ` [SLUB 3/5] Validation of slabs (metadata and guard zones) Christoph Lameter
2007-04-11 3:08 ` Andrew Morton
2007-04-10 19:19 ` [SLUB 4/5] Add ability to list alloc / free callers per slab Christoph Lameter
2007-04-10 19:19 ` [SLUB 5/5] Drop version number Christoph Lameter
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