On 30 Oct 2020, at 14:12, Matthew Wilcox wrote: > On Fri, Oct 30, 2020 at 11:57:15AM -0400, Zi Yan wrote: >> In isolate_migratepages_block, when cc->alloc_contig is true, we are >> able to isolate compound pages, nr_migratepages and nr_isolated did not >> count compound pages correctly, causing us to isolate more pages than we >> thought. Use thp_nr_pages to count pages. Otherwise, we might be trapped > ^^^^^^^^^^^^ > Maybe replace that sentence with "Count compound pages as the number of > base pages they contain"? Sure. And compound_nr is used instead of thp_nr_pages in fact. OK. V3 is coming. — Best Regards, Yan Zi
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