When running ltp stress test for 7*24 hours, the kernel occasionally complains the following warning continuously, mb_cache_shrink_scan+0x0/0x3f0 negative objects to delete nr=-9222526086287711848 mb_cache_shrink_scan+0x0/0x3f0 negative objects to delete nr=-9222420761333860545 mb_cache_shrink_scan+0x0/0x3f0 negative objects to delete nr=-9222287677544280360 ... The tracing result shows the freeable(mb_cache_shrink_scan returns) is -1, which causes the continuous accumulation and overflow of total_scan. This patch make do_shrink_slab more robust when shrinker->count_objects return negative freeable. Signed-off-by: Jiang Biao <jiang.biao2@xxxxxxxxxx> --- mm/vmscan.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index eb2f031..3ea28f0 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -323,7 +323,7 @@ static unsigned long do_shrink_slab(struct shrink_control *shrinkctl, long scanned = 0, next_deferred; freeable = shrinker->count_objects(shrinker, shrinkctl); - if (freeable == 0) + if (freeable <= 0) return 0; /* -- 2.7.4 -- 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>
