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Date: Sun, 26 Apr 2020 19:21:48 +0800
From: Yang Yingliang <yangyingliang@...wei.com>
To: <tj@...nel.org>, <lizefan@...wei.com>, <hannes@...xchg.org>
CC: <cgroups@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<yangyingliang@...wei.com>, <wangkefeng.wang@...wei.com>
Subject: memleak in cgroup
Hi,
When I doing the follow test in kernel-5.7-rc2, I found mem-free is
decreased
#!/bin/sh
cd /sys/fs/cgroup/memory/
for((i=0;i<45;i++))
do
for((j=0;j<60000;j++))
do
mkdir /sys/fs/cgroup/memory/yyl-cg$j
done
sleep 1
ls /sys/fs/cgroup/memory/ | grep yyl | xargs rmdir
done
before test the /proc/meminfo is:
MemTotal: 493554824 kB
MemFree: 491240912 kB
MemAvailable: 489424520 kB
Buffers: 4112 kB
Cached: 65400 kB
SwapCached: 0 kB
Active: 156016 kB
Inactive: 37720 kB
Active(anon): 128372 kB
Inactive(anon): 7188 kB
Active(file): 27644 kB
Inactive(file): 30532 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 4194300 kB
SwapFree: 4194300 kB
Dirty: 112 kB
Writeback: 0 kB
AnonPages: 124356 kB
Mapped: 53724 kB
Shmem: 11036 kB
KReclaimable: 93488 kB
Slab: 599660 kB
SReclaimable: 93488 kB
SUnreclaim: 506172 kB
KernelStack: 23008 kB
PageTables: 4340 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 250971712 kB
Committed_AS: 1834448 kB
VmallocTotal: 135290159040 kB
VmallocUsed: 229284 kB
VmallocChunk: 0 kB
Percpu: 80896 kB
HardwareCorrupted: 0 kB
AnonHugePages: 43008 kB
ShmemHugePages: 0 kB
ShmemPmdMapped: 0 kB
FileHugePages: 0 kB
FilePmdMapped: 0 kB
CmaTotal: 65536 kB
CmaFree: 40480 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
Hugetlb: 0 kB
after test:
MemTotal: 493554824 kB
MemFree: 484492920 kB
MemAvailable: 482801124 kB
Buffers: 21984 kB
Cached: 151380 kB
SwapCached: 0 kB
Active: 230000 kB
Inactive: 68068 kB
Active(anon): 130108 kB
Inactive(anon): 13804 kB
Active(file): 99892 kB
Inactive(file): 54264 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 4194300 kB
SwapFree: 4194300 kB
Dirty: 36 kB
Writeback: 0 kB
AnonPages: 125080 kB
Mapped: 55520 kB
Shmem: 19220 kB
KReclaimable: 246696 kB
Slab: 5381572 kB
SReclaimable: 246696 kB
SUnreclaim: 5134876 kB
KernelStack: 27360 kB
PageTables: 4172 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 250971712 kB
Committed_AS: 1588600 kB
VmallocTotal: 135290159040 kB
VmallocUsed: 230836 kB
VmallocChunk: 0 kB
Percpu: 1827840 kB
HardwareCorrupted: 0 kB
AnonHugePages: 43008 kB
ShmemHugePages: 0 kB
ShmemPmdMapped: 0 kB
FileHugePages: 0 kB
FilePmdMapped: 0 kB
CmaTotal: 65536 kB
CmaFree: 40480 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
Hugetlb: 0 kB
after echo 3 > /proc/sys/vm/drop_caches
MemTotal: 493554824 kB
MemFree: 485104048 kB
MemAvailable: 483358392 kB
Buffers: 6168 kB
Cached: 79904 kB
SwapCached: 0 kB
Active: 165348 kB
Inactive: 45780 kB
Active(anon): 130528 kB
Inactive(anon): 13800 kB
Active(file): 34820 kB
Inactive(file): 31980 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 4194300 kB
SwapFree: 4194300 kB
Dirty: 8 kB
Writeback: 0 kB
AnonPages: 125236 kB
Mapped: 55516 kB
Shmem: 19220 kB
KReclaimable: 226332 kB
Slab: 5353952 kB
SReclaimable: 226332 kB
SUnreclaim: 5127620 kB
KernelStack: 23040 kB
PageTables: 4212 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 250971712 kB
Committed_AS: 1672424 kB
VmallocTotal: 135290159040 kB
VmallocUsed: 230436 kB
VmallocChunk: 0 kB
Percpu: 1379840 kB
HardwareCorrupted: 0 kB
AnonHugePages: 43008 kB
ShmemHugePages: 0 kB
ShmemPmdMapped: 0 kB
FileHugePages: 0 kB
FilePmdMapped: 0 kB
CmaTotal: 65536 kB
CmaFree: 40480 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
Hugetlb: 0 kB
after test and drop caches, the /proc/cgroups is:
#subsys_name hierarchy num_cgroups enabled
cpuset 11 1 1
cpu 2 1 1
cpuacct 2 1 1
blkio 8 1 1
memory 5 83 1
devices 3 41 1
freezer 6 1 1
net_cls 9 1 1
perf_event 10 1 1
net_prio 9 1 1
hugetlb 4 1 1
pids 7 51 1
rdma 12 1 1
All the dir that created by the script is already removed, but I got:
- MemFree is decreased about 6.7G
- SUnreclaim is increased about 4.6G
- Percpu is increased about 1.7G
It seems we have memory leak in cgroup ?
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