page cache: Convert filemap_map_pages to XArray

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Slight change of strategy here; if we have trouble getting hold of a
page for whatever reason (eg a compound page is split underneath us),
don't spin to stabilise the page, just continue the iteration, like we
would if we failed to trylock the page.  Since this is a speculative
optimisation, it feels like we should allow the process to take an extra
fault if it turns out to need this page instead of spending time to pin
down a page it may not need.

Signed-off-by: Matthew Wilcox <willy@infradead.org>

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Matthew Wilcox 2018-05-17 00:08:30 -04:00

parent c1901cd33c

commit 070e807c69

1 changed files with 13 additions and 29 deletions

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mm/filemap.c

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