The commit is pushed to "branch-rh7-3.10.0-123.1.2-ovz" and will appear at
https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-123.1.2.vz7.4.9
------>
commit f3167fce64f7ae1d406fab9ea2845aafd8fc474d
Author: Dmitry Monakhov <dmonak...@openvz.org>
Date: Tue May 5 13:44:41 2015 +0400
vziolimit: port diff-vziolimit-fix-rounding-error-in-throttler
vziolimit: fix rounding error in throttler
In some cases this error can lead to doubling of IO bandwidth,
especially if the speed is small and not a divisor of 1000.
https://jira.sw.ru/browse/PSBM-13302
Signed-off-by: Konstantin Khlebnikov <khlebni...@openvz.org>
====================================
https://jira.sw.ru/browse/PSBM-20104
Signed-off-by: Dmitry Monakhov <dmonak...@openvz.org>
---
kernel/ve/vziolimit.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/kernel/ve/vziolimit.c b/kernel/ve/vziolimit.c
index 890d7e8..473e2b7 100644
--- a/kernel/ve/vziolimit.c
+++ b/kernel/ve/vziolimit.c
@@ -18,6 +18,7 @@ struct throttle {
unsigned speed; /* maximum speed, units per second */
unsigned burst; /* maximum bust, units */
unsigned latency; /* maximum wait delay, jiffies */
+ unsigned remain; /* units/HZ */
unsigned long time; /* wall time in jiffies */
long long state; /* current state in units */
};
@@ -70,8 +71,8 @@ static void throttle_charge(struct throttle *th, long long
charge)
time = now + th->latency;
th->time = time;
step *= th->speed;
- if (do_div(step, HZ))
- step++;
+ step += th->remain;
+ th->remain = do_div(step, HZ);
th->state += step;
}
}
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