This patchset move lru_lock into lruvec, give a lru_lock for each of
lruvec, thus bring a lru_lock for each of memcg.
Per memcg lru_lock would ease the lru_lock contention a lot in
this patch series.
In some data center, containers are used widely to deploy different kind
of services, then multiple memcgs share per node pgdat->lru_lock which
cause heavy lock contentions when doing lru operation.
On my 2 socket * 6 cores E5-2630 platform, 24 containers run aim9
simultaneously with mmtests' config:
# AIM9
export AIM9_TESTTIME=180
export AIM9_TESTLIST=page_test,brk_test
perf lock report show much contentions on lru_lock in 20 second snapshot:
Name acquired contended avg wait (ns) total wait
(ns) max wait (ns) min wait (ns)
&(ptlock_ptr(pag... 22 0 0 0
0 0
...
&(&pgdat->lru_lo... 9 7 12728 89096
26656 1597
With this patch series, lruvec->lru_lock show no contentions
&(&lruvec->lru_l... 8 0 0 0
0 0
and aim9 page_test/brk_test performance increased 5%~50%.
BTW, Detailed results in aim9-pft.compare.log if needed,
All containers data are increased and pretty steady.
$for i in Max Min Hmean Stddev CoeffVar BHmean-50 BHmean-95 BHmean-99; do echo
"========= $i page_test ============"; cat aim9-pft.compare.log | grep
"^$i.*page_test" | awk 'BEGIN {a=b=0;} { a+=$3; b+=$6 } END { print "5.3-rc4
" a/24; print "5.3-rc4+lru_lock " b/24}' ; done
========= Max page_test ============
5.3-rc4 34729.6
5.3-rc4+lru_lock 36128.3
========= Min page_test ============
5.3-rc4 33644.2
5.3-rc4+lru_lock 35349.7
========= Hmean page_test ============
5.3-rc4 34355.4
5.3-rc4+lru_lock 35810.9
========= Stddev page_test ============
5.3-rc4 319.757
5.3-rc4+lru_lock 223.324
========= CoeffVar page_test ============
5.3-rc4 0.93125
5.3-rc4+lru_lock 0.623333
========= BHmean-50 page_test ============
5.3-rc4 34579.2
5.3-rc4+lru_lock 35977.1
========= BHmean-95 page_test ============
5.3-rc4 34421.7
5.3-rc4+lru_lock 35853.6
========= BHmean-99 page_test ============
5.3-rc4 34421.7
5.3-rc4+lru_lock 35853.6
$for i in Max Min Hmean Stddev CoeffVar BHmean-50 BHmean-95 BHmean-99; do echo
"========= $i brk_test ============"; cat aim9-pft.compare.log | grep
"^$i.*brk_test" | awk 'BEGIN {a=b=0;} { a+=$3; b+=$6 } END { print "5.3-rc4
" a/24; print "5.3-rc4+lru_lock " b/24}' ; done
========= Max brk_test ============
5.3-rc4 96647.7
5.3-rc4+lru_lock 98960.3
========= Min brk_test ============
5.3-rc4 91800.8
5.3-rc4+lru_lock 96817.6
========= Hmean brk_test ============
5.3-rc4 95470
5.3-rc4+lru_lock 97769.6
========= Stddev brk_test ============
5.3-rc4 1253.52
5.3-rc4+lru_lock 596.593
========= CoeffVar brk_test ============
5.3-rc4 1.31375
5.3-rc4+lru_lock 0.609583
========= BHmean-50 brk_test ============
5.3-rc4 96141.4
5.3-rc4+lru_lock 98194
========= BHmean-95 brk_test ============
5.3-rc4 95818.5
5.3-rc4+lru_lock 97857.2
========= BHmean-99 brk_test ============
5.3-rc4 95818.5
5.3-rc4+lru_lock 97857.2
Alex Shi (14):
mm/lru: move pgdat lru_lock into lruvec
lru/memcg: move the lruvec->pgdat sync out lru_lock
lru/memcg: using per lruvec lock in un/lock_page_lru
lru/compaction: use per lruvec lock in isolate_migratepages_block
lru/huge_page: use per lruvec lock in __split_huge_page
lru/mlock: using per lruvec lock in munlock
lru/swap: using per lruvec lock in page_cache_release
lru/swap: uer lruvec lock in activate_page
lru/swap: uer per lruvec lock in pagevec_lru_move_fn
lru/swap: use per lruvec lock in release_pages
lru/vmscan: using per lruvec lock in lists shrinking.
lru/vmscan: use pre lruvec lock in check_move_unevictable_pages
lru/vmscan: using per lruvec lru_lock in get_scan_count
mm/lru: fix the comments of lru_lock
include/linux/memcontrol.h | 24 ++++++++++----
include/linux/mm_types.h | 2 +-
include/linux/mmzone.h | 6 ++--
mm/compaction.c | 48 +++++++++++++++++-----------
mm/filemap.c | 4 +--
mm/huge_memory.c | 9 ++++--
mm/memcontrol.c | 24 ++++++--------
mm/mlock.c | 35 ++++++++++----------
mm/mmzone.c | 1 +
mm/page_alloc.c | 1 -
mm/page_idle.c | 4 +--
mm/rmap.c | 2 +-
mm/swap.c | 79 +++++++++++++++++++++++++---------------------
mm/vmscan.c | 63 ++++++++++++++++++------------------
14 files changed, 166 insertions(+), 136 deletions(-)
--
1.8.3.1
