X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=mm%2Fvmpressure.c;h=3fb15c25af873ae0f44b804ed80baeafc1a1e9a6;hb=f73494dbd19d279723575a3b7432401635a9c49f;hp=c5afd573d7da79afc814225043319cc66120addf;hpb=34b85e3574424beb30e4cd163e6da2e2282d2683;p=firefly-linux-kernel-4.4.55.git

diff --git a/mm/vmpressure.c b/mm/vmpressure.c
index c5afd573d7da..3fb15c25af87 100644
--- a/mm/vmpressure.c
+++ b/mm/vmpressure.c
@@ -112,8 +112,15 @@ static enum vmpressure_levels vmpressure_calc_level(unsigned long scanned,
 						    unsigned long reclaimed)
 {
 	unsigned long scale = scanned + reclaimed;
-	unsigned long pressure;
+	unsigned long pressure = 0;
 
+	/*
+	 * reclaimed can be greater than scanned in cases
+	 * like THP, where the scanned is 1 and reclaimed
+	 * could be 512
+	 */
+	if (reclaimed >= scanned)
+		goto out;
 	/*
 	 * We calculate the ratio (in percents) of how many pages were
 	 * scanned vs. reclaimed in a given time frame (window). Note that
@@ -124,6 +131,7 @@ static enum vmpressure_levels vmpressure_calc_level(unsigned long scanned,
 	pressure = scale - (reclaimed * scale / scanned);
 	pressure = pressure * 100 / scale;
 
+out:
 	pr_debug("%s: %3lu  (s: %lu  r: %lu)\n", __func__, pressure,
 		 scanned, reclaimed);