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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 /fs
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/proc/meminfo.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index c3dac611c3c0..1efaaa19c4f3 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -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]),