Messages in this thread Patch in this message | | | From | Jiang Biao <> | Subject | [PATCH] mm/vmscan: make do_shrink_slab more robust. | Date | Mon, 27 Nov 2017 09:37:30 +0800 |
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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@zte.com.cn> --- 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
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