On Fri, Aug 12, 2022 at 03:45:09PM +0900, Joonsoo Kim wrote: > 2022년 8월 12일 (금) 오후 12:48, CGEL <cgel.zte@xxxxxxxxx>님이 작성: > > > > We have discussed related question before. See: > > https://lore.kernel.org/all/Yio17pXawRuuVJFO@xxxxxxxxxxx/ > > The problem is that there is no suitable place to measure pagecache thrashing > > in fs level likes swap_readpage(). We have to measure it in folio_wait_bit_common(). > > > > If we measure swap thrashing just in swap_readpage(), we will miss pagecache > > thrashing. If we measure swap thrashing in swap_readpage(), and measure > > pagecache thrashing in folio_wait_bit_common(), it will be rerpeated calculation. > > Maybe, repeated calculation issue could be easily solved by > re-entrance detection on > delayacct_thrashing_start(). > If no other suggestion from others, I will commit another patch to realize this. And I think this patch will not conflict with the later patch. Thanks. > Thanks.
