memfd: Convert memfd_wait_for_pins to XArray

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Simplify the locking by taking the spinlock while we walk the tree on
the assumption that many acquires and releases of the lock will be worse
than holding the lock while we process an entire batch of pages.

Signed-off-by: Matthew Wilcox <willy@infradead.org>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>

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Matthew Wilcox 2017-11-22 11:11:31 -05:00

parent 7ae3424fb4

commit 2313216f86

1 changed files with 25 additions and 36 deletions

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mm/memfd.c

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