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Message-Id: <20070509120947.B91A.Y-GOTO@jp.fujitsu.com> Date: Wed, 09 May 2007 12:12:32 +0900 From: Yasunori Goto <y-goto@...fujitsu.com> To: Linux Kernel ML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org> Cc: Andrew Morton <akpm@...l.org>, Christoph Lameter <clameter@....com>, Mel Gorman <mel@....ul.ie> Subject: [RFC] memory hotremove patch take 2 [10/10] (retry swap-in page) There is a race condition between swap-in and unmap_and_move(). When swap-in occur, page_mapped might be not set yet. So, unmap_and_move() gives up at once, and tries later. Signed-off-by: Yasunori Goto <y-goto@...fujitsu.com> mm/migrate.c | 5 +++++ 1 files changed, 5 insertions(+) Index: current_test/mm/migrate.c =================================================================== --- current_test.orig/mm/migrate.c 2007-05-08 15:08:09.000000000 +0900 +++ current_test/mm/migrate.c 2007-05-08 15:08:09.000000000 +0900 @@ -670,6 +670,11 @@ static int unmap_and_move(new_page_t get /* hold this anon_vma until remove_migration_ptes() finishes */ anon_vma_hold(page); } + + if (PageSwapCache(page) && !page_mapped(page)) + /* swap in now. try lator*/ + goto unlock; + /* * Establish migration ptes or remove ptes */ -- Yasunori Goto - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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