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hi Johannes My name is Zhiyuan
zhu, an android development engineer in
htc. We encounter a
lowmemorykiller’s problem. Coluld you help to kindly support? Thank you. Problem
describtion: We noticed that gap of dumping cached value from “lowmemorykiller” and “/proc/meminfo/”
are different apparently. Like example below, lowmemorykiller showed cache only has 72460kB while launcher was killed, but /proc/meminfo showed cached still has 142448kB. Please
check why the gap of cache value between lowmemorykill and /proc/meminfo are huge.
kernel_e0058_0001_20141107_204711_LC4ABYA00200_htc_a31ul_0.54.999.1.txt at LC4ABYA00200
6 161030.084144
2014-11-07 21:44:53.304 lowmemorykiller: Killing 'om.htc.launcher' (4486),
adj 294, 6
161030.084144 2014-11-07 21:44:53.304
to free 47856kB on behalf of 'kworker/u8:14' (20594) because 6
161030.084144 2014-11-07 21:44:53.304
cache 72460kB is below limit 73728kB for
oom_score_adj 235 6
161030.084144 2014-11-07 21:44:53.304
Free memory is 51304kB above reserved 4
161030.084797 2014-11-07 21:44:53.304
MemFree:
55676 kB 4
161030.084797 2014-11-07 21:44:53.304
Buffers: 1240 kB 4
161030.084797 2014-11-07 21:44:53.304
Cached: 142448 kB Lowmemorykiller
calculated cache value is 72460kB, but the /proc/meminfo’s cached is 142448 kB After checked the code, I found that: Lowmemorykiller’s memory information is comes from /proc/zoneinfo
file’s nr_file_pages So I want to know how different the /proc/zoneinfo file’s
nr_file_pages and /proc/meminfo file’s Cached ? Thanks Zhiyuan
zhu MEMORY RESOURCE CONTROLLER M:
Johannes Weiner <hannes@xxxxxxxxxxx> M:
Michal Hocko <mhocko@xxxxxxx> M:
Balbir Singh <bsingharora@xxxxxxxxx> M:
KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> L:
cgroups@xxxxxxxxxxxxxxx L:
linux-mm@xxxxxxxxx S:
Maintained F:
mm/memcontrol.c F:
mm/page_cgroup.c
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