From: "Stephen C. Tweedie" <sct@redhat.com>
To: Rik van Riel <riel@conectiva.com.br>
Cc: "Stephen C. Tweedie" <sct@redhat.com>,
Marcelo Tosatti <marcelo@conectiva.com.br>,
David Gould <dg@suse.com>,
"Eric W. Biederman" <ebiederm@xmission.com>,
lkml <linux-kernel@vger.kernel.org>,
linux-mm@kvack.org
Subject: Re: [PATCH] vma limited swapin readahead
Date: Thu, 1 Feb 2001 17:27:02 +0000 [thread overview]
Message-ID: <20010201172702.X11607@redhat.com> (raw)
In-Reply-To: <20010201143606.P11607@redhat.com> <Pine.LNX.4.21.0102011441380.1321-100000@duckman.distro.conectiva>
In-Reply-To: <Pine.LNX.4.21.0102011441380.1321-100000@duckman.distro.conectiva>; from riel@conectiva.com.br on Thu, Feb 01, 2001 at 02:45:04PM -0200
Hi,
On Thu, Feb 01, 2001 at 02:45:04PM -0200, Rik van Riel wrote:
> On Thu, 1 Feb 2001, Stephen C. Tweedie wrote:
>
> But only when the extra pages we're reading in don't
> displace useful data from memory, making us fault in
> those other pages ... causing us to go to the disk
> again and do more readahead, which could potentially
> displace even more pages, etc...
Remember, it's a balance. You can displace a few useful pages and
still win overall because the cost _per page_ goes way down due to
better disk IO utilisation.
> One solution could be to put (most of) the swapin readahead
> pages on the inactive_dirty list, so pressure by readahead
> on the resident pages is smaller and the not used readahead
> pages are reclaimed faster.
Yep, that would make much sense.
--Stephen
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WARNING: multiple messages have this Message-ID (diff)
From: "Stephen C. Tweedie" <sct@redhat.com>
To: Rik van Riel <riel@conectiva.com.br>
Cc: "Stephen C. Tweedie" <sct@redhat.com>,
Marcelo Tosatti <marcelo@conectiva.com.br>,
David Gould <dg@suse.com>,
"Eric W. Biederman" <ebiederm@xmission.com>,
lkml <linux-kernel@vger.kernel.org>,
linux-mm@kvack.org
Subject: Re: [PATCH] vma limited swapin readahead
Date: Thu, 1 Feb 2001 17:27:02 +0000 [thread overview]
Message-ID: <20010201172702.X11607@redhat.com> (raw)
In-Reply-To: <Pine.LNX.4.21.0102011441380.1321-100000@duckman.distro.conectiva>; from riel@conectiva.com.br on Thu, Feb 01, 2001 at 02:45:04PM -0200
Hi,
On Thu, Feb 01, 2001 at 02:45:04PM -0200, Rik van Riel wrote:
> On Thu, 1 Feb 2001, Stephen C. Tweedie wrote:
>
> But only when the extra pages we're reading in don't
> displace useful data from memory, making us fault in
> those other pages ... causing us to go to the disk
> again and do more readahead, which could potentially
> displace even more pages, etc...
Remember, it's a balance. You can displace a few useful pages and
still win overall because the cost _per page_ goes way down due to
better disk IO utilisation.
> One solution could be to put (most of) the swapin readahead
> pages on the inactive_dirty list, so pressure by readahead
> on the resident pages is smaller and the not used readahead
> pages are reclaimed faster.
Yep, that would make much sense.
--Stephen
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux.eu.org/Linux-MM/
next prev parent reply other threads:[~2001-02-01 17:29 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-01-31 3:05 [PATCH] vma limited swapin readahead Marcelo Tosatti
2001-01-31 3:05 ` Marcelo Tosatti
2001-01-31 10:21 ` Stephen C. Tweedie
2001-01-31 10:21 ` Stephen C. Tweedie
2001-01-31 8:40 ` Marcelo Tosatti
2001-01-31 8:40 ` Marcelo Tosatti
2001-01-31 19:40 ` Eric W. Biederman
2001-01-31 19:40 ` Eric W. Biederman
2001-02-01 0:24 ` David Gould
2001-02-01 0:24 ` David Gould
2001-02-01 7:41 ` Eric W. Biederman
2001-02-01 7:41 ` Eric W. Biederman
2001-02-01 11:26 ` Stephen C. Tweedie
2001-02-01 11:26 ` Stephen C. Tweedie
2001-02-01 10:53 ` Marcelo Tosatti
2001-02-01 10:53 ` Marcelo Tosatti
2001-02-01 14:36 ` Stephen C. Tweedie
2001-02-01 14:36 ` Stephen C. Tweedie
2001-02-01 16:45 ` Rik van Riel
2001-02-01 16:45 ` Rik van Riel
2001-02-01 17:20 ` Ingo Oeser
2001-02-01 17:20 ` Ingo Oeser
2001-02-01 17:54 ` Rik van Riel
2001-02-01 17:54 ` Rik van Riel
2001-02-01 17:27 ` Stephen C. Tweedie [this message]
2001-02-01 17:27 ` Stephen C. Tweedie
2001-02-01 18:59 ` David Gould
2001-02-01 18:59 ` David Gould
2001-02-01 19:07 ` Rik van Riel
2001-02-01 19:07 ` Rik van Riel
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