From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Pavel Machek <pavel@suse.cz>
Cc: Andrew Morton <akpm@osdl.org>, LKML <linux-kernel@vger.kernel.org>
Subject: [RFC][PATCH -mm 0/2] mm: shrink_all_memory improvements
Date: Mon, 27 Feb 2006 19:26:19 +0100 [thread overview]
Message-ID: <200602271926.20294.rjw@sisk.pl> (raw)
Hi,
The following two patches are designed to improve the shrink_all_memory()
function used by swsusp and other pm functions.
The first patch makes shrink_all_memory() overflow-resistant. The problem is
that, AFAICT, balance_pgdat(pgdat, nr_to_free, 0) may free more than nr_to_free
pages, in which case nr_to_free, being unsigned, will overflow (and obviously
it cannot be less than 0). Also if the argument is too big, strange things may
happen.
The first patch adds a workaround of the problem that shrink_all_memory() may
return 0 even if there still are some pages to free. WIth this patch applied
it sometimes frees 2 times as many pages as without it on my box.
Please have a look and comment.
Greetings,
Rafael
--
Beer is proof that God loves us and wants us to be happy - Benjamin Franklin
next reply other threads:[~2006-02-27 18:30 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-27 18:26 Rafael J. Wysocki [this message]
2006-02-27 18:28 ` [RFC][PATCH -mm 1/2] mm: make shrink_all_memory overflow-resistant Rafael J. Wysocki
2006-02-27 18:53 ` Jesper Juhl
2006-02-27 19:02 ` Pavel Machek
2006-02-27 19:06 ` Jesper Juhl
2006-02-27 23:15 ` Rafael J. Wysocki
2006-02-28 3:16 ` Andrew Morton
2006-02-28 17:28 ` Rafael J. Wysocki
2006-02-27 18:30 ` [RFC][PATCH -mm 2/2] mm: make shrink_all_memory try harder Rafael J. Wysocki
2006-02-28 3:25 ` Andrew Morton
2006-02-28 17:25 ` Rafael J. Wysocki
2006-02-28 18:46 ` Andrew Morton
2006-02-28 23:04 ` Rafael J. Wysocki
2006-02-27 18:33 ` [RFC][PATCH -mm 0/2] mm: shrink_all_memory improvements Pavel Machek
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