From: Benjamin LaHaise <bcrl@redhat.com>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Linux MM mailing list <linux-mm@kvack.org>, torvalds@transmeta.com
Subject: Re: Under what conditions are VMAs merged?
Date: Wed, 17 Oct 2001 21:58:18 -0400 [thread overview]
Message-ID: <20011017215818.A2804@redhat.com> (raw)
In-Reply-To: <3BCE20DF.6090103@zytor.com>; from hpa@zytor.com on Wed, Oct 17, 2001 at 05:22:55PM -0700
On Wed, Oct 17, 2001 at 05:22:55PM -0700, H. Peter Anvin wrote:
> In the checkpoint routine I thought doing an mprotect(PROT_READ) on the
> entire region as a single system call would coalesce the VMAs, but
> apparently that is not the case; after running my standard stress-test
> application, /proc/pid/maps show 51635 mappings, most of them contiguous
> and otherwise matching the surrounding mappings in every way; a dump of
Only anonymous vmas are candidates for merging. Take it up with the head
penguin. No merging at all is done for shared vmas.
-ben
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prev parent reply other threads:[~2001-10-18 1:58 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-10-18 0:22 Under what conditions are VMAs merged? H. Peter Anvin
2001-10-18 1:58 ` Benjamin LaHaise [this message]
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