---

yaml --- r: 213067 b: refs/heads/master c: c49c06e h: refs/heads/master i: 213065: 2e1f3c8 213063: e66dc18 v: v3
git-mirror · Oct 1, 2010 · f2919e9 · f2919e9
1 parent e407689
commit f2919e9
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Showing 2 changed files with 16 additions and 2 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 9355aede5a3c4975e0ba8bbfe2b9d1fd73308916
+refs/heads/master: c49c06e4960949a9bced708858433fcf6ca36a9c
diff --git a/trunk/block/blk-throttle.c b/trunk/block/blk-throttle.c
@@ -430,6 +430,7 @@ static bool tg_with_in_iops_limit(struct throtl_data *td, struct throtl_grp *tg,
 	bool rw = bio_data_dir(bio);
 	unsigned int io_allowed;
 	unsigned long jiffy_elapsed, jiffy_wait, jiffy_elapsed_rnd;
+	u64 tmp;
 
 	jiffy_elapsed = jiffy_elapsed_rnd = jiffies - tg->slice_start[rw];
 
@@ -439,7 +440,20 @@ static bool tg_with_in_iops_limit(struct throtl_data *td, struct throtl_grp *tg,
 
 	jiffy_elapsed_rnd = roundup(jiffy_elapsed_rnd, throtl_slice);
 
-	io_allowed = (tg->iops[rw] * jiffy_elapsed_rnd) / HZ;
+	/*
+	 * jiffy_elapsed_rnd should not be a big value as minimum iops can be
+	 * 1 then at max jiffy elapsed should be equivalent of 1 second as we
+	 * will allow dispatch after 1 second and after that slice should
+	 * have been trimmed.
+	 */
+
+	tmp = (u64)tg->iops[rw] * jiffy_elapsed_rnd;
+	do_div(tmp, HZ);
+
+	if (tmp > UINT_MAX)
+		io_allowed = UINT_MAX;
+	else
+		io_allowed = tmp;
 
 	if (tg->io_disp[rw] + 1 <= io_allowed) {
 		if (wait)