In vmpressure, the pressure level is calculated based on the ratio of how many pages were scanned vs. reclaimed in a given time window. However, there is a possibility that "scanned < reclaimed" in such a case, when reclaiming ends by fatal signal in shrink_inactive_list. So, with this patch, we just return "low" level when "scanned < reclaimed" happens not to have userland miss reclaim activity. Signed-off-by: Hyunhee Kim <hyunhee.kim@xxxxxxxxxxx> Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx> --- mm/vmpressure.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/mm/vmpressure.c b/mm/vmpressure.c index 736a601..8c60cad 100644 --- a/mm/vmpressure.c +++ b/mm/vmpressure.c @@ -119,6 +119,14 @@ static enum vmpressure_levels vmpressure_calc_level(unsigned long scanned, unsigned long pressure; /* + * This could happen, in such a case, when reclaiming ends by fatal + * signal in shrink_inactive_list(). In this case, return + * VMPRESSURE_LOW not to have userland miss reclaim activity. + */ + if (reclaimed > scanned) + return VMPRESSURE_LOW; + + /* * We calculate the ratio (in percents) of how many pages were * scanned vs. reclaimed in a given time frame (window). Note that * time is in VM reclaimer's "ticks", i.e. number of pages -- 1.7.9.5 -- 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>