Messages in this thread | | | Date | Sun, 27 Mar 2016 23:44:13 +0300 | From | "Kirill A. Shutemov" <> | Subject | Re: Bloat caused by unnecessary calls to compound_head()? |
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On Sun, Mar 27, 2016 at 04:33:04PM -0400, George Spelvin wrote: > Could you just mark compound_head __pure? That would tell the compiler > that it's safe to re-use the return value as long as there is no memory > mutation in between. >
Hm. It has some positive impact, but it's not dramatic. For instance, mm/swap.o results:
add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-43 (-43) function old new delta __page_cache_release 319 298 -21 release_pages 722 700 -22
mark_page_accessed() problem was not fixed by that.
-- Kirill A. Shutemov
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