On Fri, Mar 21, 2014 at 2:17 PM, John Stultz <john.stultz@xxxxxxxxxx> wrote: > Users of volatile ranges will need to know if memory was discarded. > This patch adds the purged state tracking required to inform userland > when it marks memory as non-volatile that some memory in that range > was purged and needs to be regenerated. > > This simplified implementation which uses some of the logic from > Minchan's earlier efforts, so credit to Minchan for his work. > > Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > Cc: Android Kernel Team <kernel-team@xxxxxxxxxxx> > Cc: Johannes Weiner <hannes@xxxxxxxxxxx> > Cc: Robert Love <rlove@xxxxxxxxxx> > Cc: Mel Gorman <mel@xxxxxxxxx> > Cc: Hugh Dickins <hughd@xxxxxxxxxx> > Cc: Dave Hansen <dave@xxxxxxxx> > Cc: Rik van Riel <riel@xxxxxxxxxx> > Cc: Dmitry Adamushko <dmitry.adamushko@xxxxxxxxx> > Cc: Neil Brown <neilb@xxxxxxx> > Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx> > Cc: Mike Hommey <mh@xxxxxxxxxxxx> > Cc: Taras Glek <tglek@xxxxxxxxxxx> > Cc: Jan Kara <jack@xxxxxxx> > Cc: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxx> > Cc: Michel Lespinasse <walken@xxxxxxxxxx> > Cc: Minchan Kim <minchan@xxxxxxxxxx> > Cc: linux-mm@xxxxxxxxx <linux-mm@xxxxxxxxx> > Signed-off-by: John Stultz <john.stultz@xxxxxxxxxx> > --- > include/linux/swap.h | 15 ++++++++-- > include/linux/swapops.h | 10 +++++++ > include/linux/vrange.h | 3 ++ > mm/vrange.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++++ > 4 files changed, 101 insertions(+), 2 deletions(-) > > diff --git a/include/linux/swap.h b/include/linux/swap.h > index 46ba0c6..18c12f9 100644 > --- a/include/linux/swap.h > +++ b/include/linux/swap.h > @@ -70,8 +70,19 @@ static inline int current_is_kswapd(void) > #define SWP_HWPOISON_NUM 0 > #endif > > -#define MAX_SWAPFILES \ > - ((1 << MAX_SWAPFILES_SHIFT) - SWP_MIGRATION_NUM - SWP_HWPOISON_NUM) > + > +/* > + * Purged volatile range pages > + */ > +#define SWP_VRANGE_PURGED_NUM 1 > +#define SWP_VRANGE_PURGED (MAX_SWAPFILES + SWP_HWPOISON_NUM + SWP_MIGRATION_NUM) > + > + > +#define MAX_SWAPFILES ((1 << MAX_SWAPFILES_SHIFT) \ > + - SWP_MIGRATION_NUM \ > + - SWP_HWPOISON_NUM \ > + - SWP_VRANGE_PURGED_NUM \ > + ) This change hwpoison and migration tag number. maybe ok, maybe not. I'd suggest to use younger number than hwpoison. (That's why hwpoison uses younger number than migration) -- 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>