(2011/05/13 23:03), Mel Gorman wrote: > Under constant allocation pressure, kswapd can be in the situation where > sleeping_prematurely() will always return true even if kswapd has been > running a long time. Check if kswapd needs to be scheduled. > > Signed-off-by: Mel Gorman<mgorman@xxxxxxx> > --- > mm/vmscan.c | 4 ++++ > 1 files changed, 4 insertions(+), 0 deletions(-) > > diff --git a/mm/vmscan.c b/mm/vmscan.c > index af24d1e..4d24828 100644 > --- a/mm/vmscan.c > +++ b/mm/vmscan.c > @@ -2251,6 +2251,10 @@ static bool sleeping_prematurely(pg_data_t *pgdat, int order, long remaining, > unsigned long balanced = 0; > bool all_zones_ok = true; > > + /* If kswapd has been running too long, just sleep */ > + if (need_resched()) > + return false; > + Hmm... I don't like this patch so much. because this code does - don't sleep if kswapd got context switch at shrink_inactive_list - sleep if kswapd didn't It seems to be semi random behavior. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>