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From: Frank Mehnert <Frank.Mehnert@Sun.COM>
To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: PFs on pages pinned with get_user_pages()
Date: Thu, 29 Jan 2009 09:05:07 +0100	[thread overview]
Message-ID: <200901290905.10966.frank.mehnert@sun.com> (raw)

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Hi,

please could someone explain me under which circumstances a pagefault,
either generated from kernel code or from userland code, can occur on
pages which are pinned with get_user_pages()?

So far my understanding was that this can _never_ happen but I seems to
be wrong. Under high memory pressure I get PFs on such pages raised from
kernel code and the PFs are handled by do_swap_page(). When this happens,
page_count is 3 but page_mapped() returns false.

Thanks in advance,

Frank
-- 
Dr.-Ing. Frank Mehnert    Sun Microsystems    http://www.sun.com/

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             reply	other threads:[~2009-01-29  8:15 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-01-29  8:05 Frank Mehnert [this message]
2009-01-29 12:28 ` Peter Zijlstra
2009-01-29 13:08   ` Frank Mehnert
2009-01-29 13:43     ` Peter Zijlstra
2009-01-29 14:02       ` Frank Mehnert
2009-01-29 14:20         ` Peter Zijlstra
2009-01-29 14:41           ` Frank Mehnert
2009-01-29 14:52             ` Peter Zijlstra
2009-01-29 16:03               ` Frank Mehnert
2009-01-29 16:11                 ` Peter Zijlstra
2009-01-30 10:34                   ` Frank Mehnert
2009-01-30 10:45                     ` Peter Zijlstra
2009-01-29 14:56             ` [PATCH] x86: add might_sleep() to do_page_fault() Peter Zijlstra
2009-01-29 14:59               ` Ingo Molnar
2009-01-29 15:02                 ` [PATCH v2] " Peter Zijlstra
2009-01-29 15:03                   ` Ingo Molnar

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