Messages in this thread | | | Date | Fri, 12 Aug 2022 03:48:48 +0000 | From | CGEL <> | Subject | Re: + filemap-make-the-accounting-of-thrashing-more-consistent.patch added to mm-unstable branch |
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We have discussed related question before. See: https://lore.kernel.org/all/Yio17pXawRuuVJFO@cmpxchg.org/ 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.
So this patch is not perfect and it works. If one day we solve the problem of measure thrashing in folio_wait_bit_common(), we may improve this patch correspond.
Thanks.
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