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| author |   KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> | 2009-06-16 15:32:54 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2009-06-16 19:47:42 -0700 |
| commit | c9e444103b5e7a5a3519f9913f59767f92e33baf (patch) | |
| tree | 6b14020dc9271b5ef22ba34daf5494ef6572abb9 /fs | |
| parent | mm: modify swap_map and add SWAP_HAS_CACHE flag (diff) | |
| download | linux-dev-c9e444103b5e7a5a3519f9913f59767f92e33baf.tar.xz linux-dev-c9e444103b5e7a5a3519f9913f59767f92e33baf.zip | |
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 'fs')
0 files changed, 0 insertions, 0 deletions