Re: [PATCH v2 3/3] mm: use PF_ONLY_HEAD for PG_active and PG_unevictable
From: Matthew Wilcox <willy@infradead.org>
Date: 2021-02-26 12:14:55
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On Fri, Feb 26, 2021 at 02:17:18AM -0700, Yu Zhao wrote:
All places but one test, set or clear PG_active and PG_unevictable on small or head pages. Use compound_head() explicitly for that singleton so the rest can rid of redundant compound_head().
How do you know it's only one place? I really wish you'd work with me on folios. They make the compiler prove that it's not a tail page.