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authorShaohua Li <shli@kernel.org>2013-02-23 04:34:37 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-24 05:50:17 +0400
commit33806f06da654092182410d974b6d3c5396ea3eb (patch)
tree7f7da99d94481a1d4c78ebf05b410fc8ba654a39 /Documentation/power/suspend-and-cpuhotplug.txt
parent9800339b5e0f0e24ab3dac349e0de80d2018832e (diff)
downloadlinux-33806f06da654092182410d974b6d3c5396ea3eb.tar.xz
swap: make each swap partition have one address_space
When I use several fast SSD to do swap, swapper_space.tree_lock is heavily contended. This makes each swap partition have one address_space to reduce the lock contention. There is an array of address_space for swap. The swap entry type is the index to the array. In my test with 3 SSD, this increases the swapout throughput 20%. [akpm@linux-foundation.org: revert unneeded change to __add_to_swap_cache] Signed-off-by: Shaohua Li <shli@fusionio.com> Cc: Hugh Dickins <hughd@google.com> Acked-by: Rik van Riel <riel@redhat.com> Acked-by: Minchan Kim <minchan@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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