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swap: make each swap partition have one address_space

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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%.

[[email protected]: revert unneeded change to  __add_to_swap_cache]
Signed-off-by: Shaohua Li <[email protected]>
Cc: Hugh Dickins <[email protected]>
Acked-by: Rik van Riel <[email protected]>
Acked-by: Minchan Kim <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Shaohua Li 2013-02-22 16:34:37 -08:00 • committed by Linus Torvalds
commit 33806f06da
8 changed files with 67 additions and 34 deletions
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4
fs/proc/meminfo.c
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@ -40,7 +40,7 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
* sysctl_overcommit_ratio / 100) + total_swap_pages;
cached = global_page_state(NR_FILE_PAGES) -
total_swapcache_pages - i.bufferram;
total_swapcache_pages() - i.bufferram;
if (cached < 0)
cached = 0;
@ -109,7 +109,7 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
K(i.freeram),
K(i.bufferram),
K(cached),
K(total_swapcache_pages),
K(total_swapcache_pages()),
K(pages[LRU_ACTIVE_ANON] + pages[LRU_ACTIVE_FILE]),
K(pages[LRU_INACTIVE_ANON] + pages[LRU_INACTIVE_FILE]),
K(pages[LRU_ACTIVE_ANON]),