Commit 18aba41c authored Jun 08, 2016 by Oleg Drokin Committed by Linus Torvalds Jun 09, 2016

mm/fadvise.c: do not discard partial pages with POSIX_FADV_DONTNEED

I noticed that the logic in the fadvise64_64 syscall is incorrect for
partial pages.  While first page of the region is correctly skipped if
it is partial, the last page of the region is mistakenly discarded.
This leads to problems for applications that read data in
non-page-aligned chunks discarding already processed data between the
reads.

A somewhat misguided application that does something like write(XX bytes
(non-page-alligned)); drop the data it just wrote; repeat gets a
significant penalty in performance as a result.

Link: http://lkml.kernel.org/r/1464917140-1506698-1-git-send-email-green@linuxhacker.ru


Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent f3a932ba

mm/fadvise.c

+11 −0

Original line number	Diff line number	Diff line
		@@ -126,6 +126,17 @@ SYSCALL_DEFINE4(fadvise64_64, int, fd, loff_t, offset, loff_t, len, int, advice)
		*/
		start_index = (offset+(PAGE_SIZE-1)) >> PAGE_SHIFT;
		end_index = (endbyte >> PAGE_SHIFT);
		if ((endbyte & ~PAGE_MASK) != ~PAGE_MASK) {
		/* First page is tricky as 0 - 1 = -1, but pgoff_t
		* is unsigned, so the end_index >= start_index
		* check below would be true and we'll discard the whole
		* file cache which is not what was asked.
		*/
		if (end_index == 0)
		break;

		end_index--;
		}

		if (end_index >= start_index) {
		unsigned long count = invalidate_mapping_pages(mapping,

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