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authorMinchan Kim <minchan@kernel.org>2016-01-15 16:55:11 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-01-15 17:56:32 -0800
commit10853a039208c4afaa322a7d802456c8dca222f4 (patch)
tree65d209d69f6e8c6e547964ea3c8a477c20b1b78e /include/linux/swap.h
parent64b42bc1cfdf6e2c3ab7315f2ff56c31cd257370 (diff)
downloadop-kernel-dev-10853a039208c4afaa322a7d802456c8dca222f4.zip
op-kernel-dev-10853a039208c4afaa322a7d802456c8dca222f4.tar.gz
mm: move lazily freed pages to inactive list
MADV_FREE is a hint that it's okay to discard pages if there is memory pressure and we use reclaimers(ie, kswapd and direct reclaim) to free them so there is no value keeping them in the active anonymous LRU so this patch moves them to inactive LRU list's head. This means that MADV_FREE-ed pages which were living on the inactive list are reclaimed first because they are more likely to be cold rather than recently active pages. An arguable issue for the approach would be whether we should put the page to the head or tail of the inactive list. I chose head because the kernel cannot make sure it's really cold or warm for every MADV_FREE usecase but at least we know it's not *hot*, so landing of inactive head would be a comprimise for various usecases. This fixes suboptimal behavior of MADV_FREE when pages living on the active list will sit there for a long time even under memory pressure while the inactive list is reclaimed heavily. This basically breaks the whole purpose of using MADV_FREE to help the system to free memory which is might not be used. Signed-off-by: Minchan Kim <minchan@kernel.org> Acked-by: Hugh Dickins <hughd@google.com> Acked-by: Michal Hocko <mhocko@suse.cz> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Mel Gorman <mgorman@suse.de> Cc: Rik van Riel <riel@redhat.com> Cc: Shaohua Li <shli@kernel.org> Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> Cc: "Kirill A. Shutemov" <kirill@shutemov.name> Cc: <yalin.wang2010@gmail.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chen Gang <gang.chen.5i5j@gmail.com> Cc: Chris Zankel <chris@zankel.net> Cc: Daniel Micay <danielmicay@gmail.com> Cc: Darrick J. Wong <darrick.wong@oracle.com> Cc: David S. Miller <davem@davemloft.net> Cc: Helge Deller <deller@gmx.de> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Jason Evans <je@fb.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Kirill A. Shutemov <kirill@shutemov.name> Cc: Matt Turner <mattst88@gmail.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michael Kerrisk <mtk.manpages@gmail.com> Cc: Mika Penttil <mika.penttila@nextfour.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Richard Henderson <rth@twiddle.net> Cc: Roland Dreier <roland@kernel.org> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Will Deacon <will.deacon@arm.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/swap.h')
-rw-r--r--include/linux/swap.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/swap.h b/include/linux/swap.h
index a282933..414e101 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -307,6 +307,7 @@ extern void lru_add_drain_cpu(int cpu);
extern void lru_add_drain_all(void);
extern void rotate_reclaimable_page(struct page *page);
extern void deactivate_file_page(struct page *page);
+extern void deactivate_page(struct page *page);
extern void swap_setup(void);
extern void add_page_to_unevictable_list(struct page *page);
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