2022년 8월 15일 (월) 오후 4:33, <cgel.zte@xxxxxxxxx>님이 작성: > > From: Yang Yang <yang.yang29@xxxxxxxxxx> > > Once upon a time, we only support accounting thrashing of page cache. > Then Joonsoo introduced workingset detection for anonymous pages and > we gained the ability to account thrashing of them[1]. > > Likes PSI, we count submission time as thrashing delay because when > the device is congested, or the submitting cgroup IO-throttled, > submission can be a significant part of overall IO time. It's not the main purpose of this patch. Without this patch, swap thrashing through frontswap or some block device supporting rw_page operation isn't measured correctly. I think that description change is required. Please refer to commit 937790699be9c8100e (mm/page_io.c: annotate refault stalls from swap_readpage). No objection on the code side. Thanks.
