From: "Stephen C. Tweedie" <sct@redhat.com>
To: bcrl@redhat.com
Cc: Kanoj Sarcar <kanoj@google.engr.sgi.com>,
linux-mm@kvack.org, torvalds@transmeta.com
Subject: Re: [PATCH] workaround for lost dirty bits on x86 SMP
Date: Tue, 12 Sep 2000 11:24:38 +0100 [thread overview]
Message-ID: <20000912112438.C28418@redhat.com> (raw)
In-Reply-To: <Pine.LNX.3.96.1000911210010.7937B-100000@kanga.kvack.org>; from bcrl@redhat.com on Mon, Sep 11, 2000 at 09:36:35PM -0400
Hi,
On Mon, Sep 11, 2000 at 09:36:35PM -0400, bcrl@redhat.com wrote:
> Fwiw, with the patch, running a make -j bzImage on a 4 way box does not
> seem to have made a difference.
Of course it won't, because you aren't testing the new behaviour!
Anonymous pages are always dirty, and shared mmaped pages in
MAP_PRIVATE regions are always clean. The only place where you need
to track the dirty bit dynamically is when you use shared writeable
mmaps --- can you measure a performance change there?
Cheers,
Stephen
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next prev parent reply other threads:[~2000-09-12 10:24 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-09-12 0:43 [PATCH] workaround for lost dirty bits on x86 SMP Ben LaHaise
2000-09-12 0:59 ` Kanoj Sarcar
2000-09-12 1:36 ` bcrl
2000-09-12 1:56 ` Rik van Riel
2000-09-12 2:34 ` Kanoj Sarcar
2000-09-12 3:39 ` Benjamin C.R. LaHaise
2000-09-12 6:13 ` Kanoj Sarcar
2000-09-12 10:24 ` Stephen C. Tweedie [this message]
2000-09-12 16:54 ` Ben LaHaise
2000-09-15 19:56 ` Linus Torvalds
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