diff options
| author | Shaohua Li <shli@kernel.org> | 2013-02-22 16:34:37 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-23 17:50:17 -0800 |
| commit | 33806f06da654092182410d974b6d3c5396ea3eb (patch) | |
| tree | 7f7da99d94481a1d4c78ebf05b410fc8ba654a39 /mm/memcontrol.c | |
| parent | 9800339b5e0f0e24ab3dac349e0de80d2018832e (diff) | |
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 'mm/memcontrol.c')
| -rw-r--r-- | mm/memcontrol.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index c878b1c69510..f85861531f22 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -6307,7 +6307,7 @@ static struct page *mc_handle_swap_pte(struct vm_area_struct *vma, * Because lookup_swap_cache() updates some statistics counter, * we call find_get_page() with swapper_space directly. */ - page = find_get_page(&swapper_space, ent.val); + page = find_get_page(swap_address_space(ent), ent.val); if (do_swap_account) entry->val = ent.val; @@ -6348,7 +6348,7 @@ static struct page *mc_handle_file_pte(struct vm_area_struct *vma, swp_entry_t swap = radix_to_swp_entry(page); if (do_swap_account) *entry = swap; - page = find_get_page(&swapper_space, swap.val); + page = find_get_page(swap_address_space(swap), swap.val); } #endif return page; |