I apologize for the half-dozen duplicate messages. I was having a
difficult time configuring git to send email and didn't realize the
messages were actually getting delivered.
Ed
jingxiang zeng <jingxiangzeng.cas@xxxxxxxxx> 于2024年8月29日周四 16:36写道：
>
> Commit 14aa8b2d5c2e ("mm/mglru: don't sync disk for each aging cycle")
> removed the opportunity to wake up flushers during the MGLRU page
> reclamation process can lead to an increased likelihood of triggering
> OOM when encountering many dirty pages during reclamation on MGLRU.
>
> This leads to premature OOM if there are too many dirty pages in cgroup:
> Killed
>
> dd invoked oom-killer: gfp_mask=0x101cca(GFP_HIGHUSER_MOVABLE|__GFP_WRITE),
> order=0, oom_score_adj=0
>
> Call Trace:
> <TASK>
> dump_stack_lvl+0x5f/0x80
> dump_stack+0x14/0x20
> dump_header+0x46/0x1b0
> oom_kill_process+0x104/0x220
> out_of_memory+0x112/0x5a0
> mem_cgroup_out_of_memory+0x13b/0x150
> try_charge_memcg+0x44f/0x5c0
> charge_memcg+0x34/0x50
> __mem_cgroup_charge+0x31/0x90
> filemap_add_folio+0x4b/0xf0
> __filemap_get_folio+0x1a4/0x5b0
> ? srso_return_thunk+0x5/0x5f
> ? __block_commit_write+0x82/0xb0
> ext4_da_write_begin+0xe5/0x270
> generic_perform_write+0x134/0x2b0
> ext4_buffered_write_iter+0x57/0xd0
> ext4_file_write_iter+0x76/0x7d0
> ? selinux_file_permission+0x119/0x150
> ? srso_return_thunk+0x5/0x5f
> ? srso_return_thunk+0x5/0x5f
> vfs_write+0x30c/0x440
> ksys_write+0x65/0xe0
> __x64_sys_write+0x1e/0x30
> x64_sys_call+0x11c2/0x1d50
> do_syscall_64+0x47/0x110
> entry_SYSCALL_64_after_hwframe+0x76/0x7e
>
> memory: usage 308224kB, limit 308224kB, failcnt 2589
> swap: usage 0kB, limit 9007199254740988kB, failcnt 0
>
> ...
> file_dirty 303247360
> file_writeback 0
> ...
>
> oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=test,
> mems_allowed=0,oom_memcg=/test,task_memcg=/test,task=dd,pid=4404,uid=0
> Memory cgroup out of memory: Killed process 4404 (dd) total-vm:10512kB,
> anon-rss:1152kB, file-rss:1824kB, shmem-rss:0kB, UID:0 pgtables:76kB
> oom_score_adj:0
>
> Wake up flushers when legacy cgroups run out of clean caches.
>
> Fixes: 14aa8b2d5c2e ("mm/mglru: don't sync disk for each aging cycle")
> Signed-off-by: Zeng Jingxiang <linuszeng@xxxxxxxxxxx>
> Signed-off-by: kasong <kasong@xxxxxxxxxxx>
