On Wed, 9 Oct 2024 15:49:53 +0800 "zhaoyang.huang" <zhaoyang.huang@xxxxxxxxxx> wrote: > From: Zhaoyang Huang <zhaoyang.huang@xxxxxxxxxx> > > The test case of [1] leads to system hang which caused by a local > watchdog thread starved over 20s on a 5.5GB RAM ANDROID15(v6.6) > system. This commit solve the issue by have the reclaimer be throttled > and increase min_seq if both page types reach MIN_NR_GENS, which may > introduce a livelock of switching type with holding lruvec->lru_lock. > > [1] > launch below script 8 times simutanously which allocates 1GB virtual > memory and access it from user space by each thread. > $ costmem -c1024000 -b12800 -o0 & > That looks like a pretty simple testcase. Do people know where to get `costmem' from? > --- a/mm/vmscan.c > +++ b/mm/vmscan.c This is a somewhat serious issue, so I'll add the patch for some testing, but I'll await feedback from MGLRU developers before proceeeding further, thanks.
