From: Sasha Sirotkin <buildroot@browserseal.com>
To: linux-mm@kvack.org
Subject: question about COW
Date: Sat, 17 Apr 2010 10:07:26 +0300 [thread overview]
Message-ID: <4BC95E2E.5040801@browserseal.com> (raw)
There is an "early COW" mechanism in __do_fault() which, if the page is
not present and the fault is FAULT_PAGE_WRITE goes ahead and copies the
page in order to prevent the next exception.
The question - why the code in __do_fault() does not decrease the shared
map count of the old page as do_wp_page does ? And while we are at it,
while this "early COW" code is much more simple than do_wp_page()?
Thanks.
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next reply other threads:[~2010-04-17 7:07 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-17 7:07 Sasha Sirotkin [this message]
2010-04-19 3:47 ` question about COW KAMEZAWA Hiroyuki
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