Re: [PATCH v3] mm: memcg: Fix memcg reclaim soft lockup

2020-08-27 Thread Johannes Weiner
On Thu, Aug 27, 2020 at 10:32:29AM +0800, Xunlei Pang wrote: > We've met softlockup with "CONFIG_PREEMPT_NONE=y", when > the target memcg doesn't have any reclaimable memory. > > It can be easily reproduced as below: > watchdog: BUG: soft lockup - CPU#0 stuck for 111s![memcg_test:2204] > CPU: 0

[PATCH v3] mm: memcg: Fix memcg reclaim soft lockup

2020-08-26 Thread Xunlei Pang
We've met softlockup with "CONFIG_PREEMPT_NONE=y", when the target memcg doesn't have any reclaimable memory. It can be easily reproduced as below: watchdog: BUG: soft lockup - CPU#0 stuck for 111s![memcg_test:2204] CPU: 0 PID: 2204 Comm: memcg_test Not tainted 5.9.0-rc2+ #12 Call Trace: