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author | Huang Ying <ying.huang@intel.com> | 2017-05-03 23:54:39 +0200 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-05-04 00:52:10 +0200 |
commit | 2872bb2d0a4952ffb721e703555cb73d40b2c2f0 (patch) | |
tree | 6f7936193bf981d5aff8f1af8b723dd0c0dabb2b /mm/page_ext.c | |
parent | mm, swap: improve readability via make spin_lock/unlock balanced (diff) | |
download | linux-2872bb2d0a4952ffb721e703555cb73d40b2c2f0.tar.xz linux-2872bb2d0a4952ffb721e703555cb73d40b2c2f0.zip |
mm, swap: avoid lock swap_avail_lock when held cluster lock
Cluster lock is used to protect the swap_cluster_info and corresponding
elements in swap_info_struct->swap_map[]. But it is found that now in
scan_swap_map_slots(), swap_avail_lock may be acquired when cluster lock
is held. This does no good except making the locking more complex and
improving the potential locking contention, because the
swap_info_struct->lock is used to protect the data structure operated in
the code already. Fix this via moving the corresponding operations in
scan_swap_map_slots() out of cluster lock.
Link: http://lkml.kernel.org/r/20170317064635.12792-3-ying.huang@intel.com
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Acked-by: Tim Chen <tim.c.chen@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_ext.c')
0 files changed, 0 insertions, 0 deletions