Hi,
I have a system that application is doing a loop on top of block device,
(which I think is stupid,)
as more and more memory goes into Buffers, then applications started
to get -ENOMEM or be oom-killed later (depends on vm.overcommit_memory setting)
In this case, if I do a manual reclaim (echo 3 > /proc/sys/vm/drop_caches)
I see 90+% of the Buffers is reclaimable, but why it's not reclaimed
to fullfill applications' memory allocation request?
-bash-4.2$ sudo losetup -a
/dev/loop0: [0005]:16512 (/dev/dm-2)
-bash-4.2$ free -m
total used free shared buffers cached
Mem: 48094 46081 2012 40 40324 2085
-/+ buffers/cache: 3671 44422
Swap: 8191 5 8186
I've tried sysctl mm.vfs_cache_pressure=10000 but that seems working to Cached
memory, I wonder is there another sysctl for reclaming Buffers?
Thanks,
- Derek
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