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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2009-06-16 15:32:54 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-16 19:47:42 -0700
commitc9e444103b5e7a5a3519f9913f59767f92e33baf (patch)
tree6b14020dc9271b5ef22ba34daf5494ef6572abb9 /mm/oom_kill.c
parent355cfa73ddff2fb8fa14e93bd94a057cc022512e (diff)
mm: reuse unused swap entry if necessary
Presently we can know a swap entry is just used as SwapCache via swap_map, without looking up swap cache. Then, we have a chance to reuse swap-cache-only swap entries in get_swap_pages(). This patch tries to free swap-cache-only swap entries if swap is not enough. Note: We hit following path when swap_cluster code cannot find a free cluster. Then, vm_swap_full() is not only condition to allow the kernel to reclaim unused swap. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Balbir Singh <balbir@in.ibm.com> Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Dhaval Giani <dhaval@linux.vnet.ibm.com> Cc: YAMAMOTO Takashi <yamamoto@valinux.co.jp> Tested-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/oom_kill.c')
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