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mm/rmap: share the i_mmap_rwsem

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Similarly to the anon memory counterpart, we can share the mapping's lock
ownership as the interval tree is not modified when doing doing the walk,
only the file page.

Signed-off-by: Davidlohr Bueso <[email protected]>
Acked-by: Rik van Riel <[email protected]>
Acked-by: "Kirill A. Shutemov" <[email protected]>
Acked-by: Hugh Dickins <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Srikar Dronamraju <[email protected]>
Acked-by: Mel Gorman <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Davidlohr Bueso 2014-12-12 16:54:27 -08:00 • committed by Linus Torvalds
commit 3dec0ba0be
2 changed files with 13 additions and 3 deletions
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6
mm/rmap.c
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@ -1690,7 +1690,8 @@ static int rmap_walk_file(struct page *page, struct rmap_walk_control *rwc)
if (!mapping)
return ret;
i_mmap_lock_write(mapping);
i_mmap_lock_read(mapping);
vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff) {
unsigned long address = vma_address(page, vma);
@ -1711,9 +1712,8 @@ static int rmap_walk_file(struct page *page, struct rmap_walk_control *rwc)
goto done;
ret = rwc->file_nonlinear(page, mapping, rwc->arg);
done:
i_mmap_unlock_write(mapping);
i_mmap_unlock_read(mapping);
return ret;
}