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| author | Joonsoo Kim <iamjoonsoo.kim@lge.com> | 2018-04-10 16:30:27 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-04-11 10:28:32 -0700 |
| commit | b7d349c741293b694c552593dbd7d38ea7eb7143 (patch) | |
| tree | a1e1391762d3a6f1c5094e6f50504728f6e77e1c /lib | |
| parent | 3d2054ad8c2d5100b68b0c0405f89fd90bf4107b (diff) | |
| download | linux-b7d349c741293b694c552593dbd7d38ea7eb7143.tar.gz linux-b7d349c741293b694c552593dbd7d38ea7eb7143.tar.bz2 linux-b7d349c741293b694c552593dbd7d38ea7eb7143.zip | |
mm/thp: don't count ZONE_MOVABLE as the target for freepage reserving
There was a regression report for "mm/cma: manage the memory of the CMA
area by using the ZONE_MOVABLE" [1] and I think that it is related to
this problem. CMA patchset makes the system use one more zone
(ZONE_MOVABLE) and then increases min_free_kbytes. It reduces usable
memory and it could cause regression.
ZONE_MOVABLE only has movable pages so we don't need to keep enough
freepages to avoid or deal with fragmentation. So, don't count it.
This changes min_free_kbytes and thus min_watermark greatly if
ZONE_MOVABLE is used. It will make the user uses more memory.
System:
22GB ram, fakenuma, 2 nodes. 5 zones are used.
Before:
min_free_kbytes: 112640
zone_info (min_watermark):
Node 0, zone DMA
min 19
Node 0, zone DMA32
min 3778
Node 0, zone Normal
min 10191
Node 0, zone Movable
min 0
Node 0, zone Device
min 0
Node 1, zone DMA
min 0
Node 1, zone DMA32
min 0
Node 1, zone Normal
min 14043
Node 1, zone Movable
min 127
Node 1, zone Device
min 0
After:
min_free_kbytes: 90112
zone_info (min_watermark):
Node 0, zone DMA
min 15
Node 0, zone DMA32
min 3022
Node 0, zone Normal
min 8152
Node 0, zone Movable
min 0
Node 0, zone Device
min 0
Node 1, zone DMA
min 0
Node 1, zone DMA32
min 0
Node 1, zone Normal
min 11234
Node 1, zone Movable
min 102
Node 1, zone Device
min 0
[1] (lkml.kernel.org/r/20180102063528.GG30397%20()%20yexl-desktop)
Link: http://lkml.kernel.org/r/1522913236-15776-1-git-send-email-iamjoonsoo.kim@lge.com
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib')
0 files changed, 0 insertions, 0 deletions