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SubjectRe: [PATCH] mm: fix long time stall from mm_populate
On Mon, Feb 10, 2020 at 04:19:58PM -0800, Minchan Kim wrote:
> filemap_fault
> find a page form page(PG_uptodate|PG_readahead|PG_writeback)

Uh ... That shouldn't be possible.

/*
* Same bit is used for PG_readahead and PG_reclaim.
*/
if (PageWriteback(page))
return;

ClearPageReadahead(page);

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