If mapping is empty (both ->nrpages and ->nrexceptional is zero) we can avoid pointless lookups in empty radix tree and bail out immediately after cleancache invalidation. Signed-off-by: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx> --- mm/truncate.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/truncate.c b/mm/truncate.c index 6263aff..8f12b0e 100644 --- a/mm/truncate.c +++ b/mm/truncate.c @@ -624,6 +624,9 @@ int invalidate_inode_pages2_range(struct address_space *mapping, int did_range_unmap = 0; cleancache_invalidate_inode(mapping); + if (mapping->nrpages == 0 && mapping->nrexceptional == 0) + return 0; + pagevec_init(&pvec, 0); index = start; while (index <= end && pagevec_lookup_entries(&pvec, mapping, index, -- 2.10.2 -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
