Messages in this thread | | | Date | Sun, 2 Jul 2023 13:06:15 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH] writeback: Account the number of pages written back |
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On Wed, 28 Jun 2023 19:55:48 +0100 "Matthew Wilcox (Oracle)" <willy@infradead.org> wrote:
> nr_to_write is a count of pages, so we need to decrease it by the number > of pages in the folio we just wrote, not by 1. Most callers specify > either LONG_MAX or 1, so are unaffected, but writeback_sb_inodes() > might end up writing 512x as many pages as it asked for.
512 is a big number, Should we backport this?
> Fixes: 793917d997df ("mm/readahead: Add large folio readahead")
I'm not seeing how a readahead change messed up writeback accounting?
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