On 12/03/2014 01:42 AM, Mel Gorman wrote: > It is not obvious from the interface that partial page discard requests > are ignored. It should be spelled out. Thanks, Mel. Applied. Cheers, Michael > Signed-off-by: Mel Gorman <mgorman@xxxxxxx> > --- > 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 > -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/ -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>