It is not obvious from the interface that partial page discard requests are ignored. It should be spelled out.
Signed-off-by: Mel Gorman <mgor...@suse.de> --- man2/posix_fadvise.2 | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/man2/posix_fadvise.2 b/man2/posix_fadvise.2 index 25d0c50..07313a9 100644 --- a/man2/posix_fadvise.2 +++ b/man2/posix_fadvise.2 @@ -144,6 +144,11 @@ A program may periodically request the kernel to free cached data that has already been used, so that more useful cached pages are not discarded instead. +Requests to discard partial pages are ignored. It is preferable to preserve +needed data than discard unneeded data. If the application requires that +data be considered for discarding then \fIoffset\fP and \fIlen\fP must be +page-aligned. + Pages that have not yet been written out will be unaffected, so if the application wishes to guarantee that pages will be released, it should call -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
