| commit | fb4f88dcabdc716c7c350e09cf4a38a419b007e1 | |
| author | Hugh Dickins <hugh@veritas.com> | |
| Sat, 3 Sep 2005 22:54:37 +0000 (3 15:54 -0700) | ||
| committer | Linus Torvalds <torvalds@evo.osdl.org> | |
| Mon, 5 Sep 2005 07:05:41 +0000 (5 00:05 -0700) | ||
| tree | 1a7806e3ac8bd45eded544763324c13c9f95c0e6 | treesnapshot (tar.gz zip) |
| parent | 89d09a2c80ea6baafb559b86d545fada05e14ab5 | commitdiff |
[PATCH] swap: get_swap_page drop swap_list_lock
Rewrite get_swap_page to allocate in just the same sequence as before, but
without holding swap_list_lock across its scan_swap_map. Decrement
nr_swap_pages and update swap_list.next in advance, while still holding
swap_list_lock. Skip full devices by testing highest_bit. Swapoff hold
swap_device_lock as well as swap_list_lock to clear SWP_WRITEOK. Reduces lock
contention when there are parallel swap devices of the same priority.
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Rewrite get_swap_page to allocate in just the same sequence as before, but
without holding swap_list_lock across its scan_swap_map. Decrement
nr_swap_pages and update swap_list.next in advance, while still holding
swap_list_lock. Skip full devices by testing highest_bit. Swapoff hold
swap_device_lock as well as swap_list_lock to clear SWP_WRITEOK. Reduces lock
contention when there are parallel swap devices of the same priority.
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| mm/swapfile.c | diffblobblamehistory |