| commit | 36005bae205da3eef0016a5c96a34f10a68afa1e | [log] [tgz] |
|---|---|---|
| author | Tim Chen <[email protected]> | Wed Feb 22 15:45:33 2017 -0800 |
| committer | Linus Torvalds <[email protected]> | Wed Feb 22 16:41:30 2017 -0800 |
| tree | b3201463a223eb7ec4a0bcf960696db21914566d | |
| parent | e8c26ab60598558ec3a626e7925b06e7417d7710 [diff] |
mm/swap: allocate swap slots in batches Currently, the swap slots are allocated one page at a time, causing contention to the swap_info lock protecting the swap partition on every page being swapped. This patch adds new functions get_swap_pages and scan_swap_map_slots to request multiple swap slots at once. This will reduces the lock contention on the swap_info lock. Also scan_swap_map_slots can operate more efficiently as swap slots often occurs in clusters close to each other on a swap device and it is quicker to allocate them together. Link: http://lkml.kernel.org/r/9fec2845544371f62c3763d43510045e33d286a6.1484082593.git.tim.c.chen@linux.intel.com Signed-off-by: Tim Chen <[email protected]> Signed-off-by: "Huang, Ying" <[email protected]> Cc: Aaron Lu <[email protected]> Cc: Andi Kleen <[email protected]> Cc: Andrea Arcangeli <[email protected]> Cc: Christian Borntraeger <[email protected]> Cc: Dave Hansen <[email protected]> Cc: Hillf Danton <[email protected]> Cc: Huang Ying <[email protected]> Cc: Hugh Dickins <[email protected]> Cc: Johannes Weiner <[email protected]> Cc: Jonathan Corbet <[email protected]> escreveu: Cc: Kirill A. Shutemov <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Minchan Kim <[email protected]> Cc: Rik van Riel <[email protected]> Cc: Shaohua Li <[email protected]> Cc: Vladimir Davydov <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>