linux-kernel - [RFC PATCH 1/2] sched/update

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 21 Jan 2014 13:33:18 +0800
From:	Alex Shi <alex.shi@...aro.org>
To:	mingo@...hat.com, peterz@...radead.org, morten.rasmussen@....com,
	vincent.guittot@...aro.org, daniel.lezcano@...aro.org,
	efault@....de
Cc:	wangyun@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	Alex Shi <alex.shi@...aro.org>
Subject: [RFC PATCH 1/2] sched/update_avg: avoid negative time

rq->avg_idle try to reflect the average idle time between the cpu idle
and first wakeup. But in the function, it maybe get a negative value
if old avg_idle is too small. Then this negative value will be double
counted in next time calculation. Guess that is not the original purpose,
so recalibrate it to zero.

Signed-off-by: Alex Shi <alex.shi@...aro.org>
---
 kernel/sched/core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 30eb011..af9121c6 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1358,6 +1358,9 @@ static void update_avg(u64 *avg, u64 sample)
 {
 	s64 diff = sample - *avg;
 	*avg += diff >> 3;
+
+	if (*avg < 0)
+		*avg = 0;
 }
 #endif
 
-- 
1.8.1.2

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/