The write_end handler is likely to call SetPageUptodate which is an atomic operation so prefetch the line. Signed-off-by: Mel Gorman <mgorman@xxxxxxx> --- mm/filemap.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/filemap.c b/mm/filemap.c index c28f69c..40713da 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -2551,6 +2551,9 @@ again: copied = iov_iter_copy_from_user_atomic(page, i, offset, bytes); flush_dcache_page(page); + if (!PageUptodate(page)) + prefetchw(&page->flags); + status = a_ops->write_end(file, mapping, pos, bytes, copied, page, fsdata); if (unlikely(status < 0)) -- 1.8.4.5 -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
