[PATCH] swap: get_swap_page drop swap_list_lock

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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>

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Hugh Dickins 2005-09-03 15:54:37 -07:00 • committed by Linus Torvalds

parent 89d09a2c80

commit fb4f88dcab

1 changed files with 36 additions and 39 deletions

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mm/swapfile.c

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