linux-kernel - [RFC][Patch 17/18] sched: update f_b_q() to use u64 for weighted cpuload

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

Message-Id: <1303332697-16426-18-git-send-email-ncrao@google.com>
Date:	Wed, 20 Apr 2011 13:51:36 -0700
From:	Nikhil Rao <ncrao@...gle.com>
To:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>
Cc:	Paul Turner <pjt@...gle.com>, Mike Galbraith <efault@....de>,
	linux-kernel@...r.kernel.org, Nikhil Rao <ncrao@...gle.com>
Subject: [RFC][Patch 17/18] sched: update f_b_q() to use u64 for weighted cpuload

Update f_b_q() to use u64 when comparing loads.

Signed-off-by: Nikhil Rao <ncrao@...gle.com>
---
 kernel/sched_fair.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 386d832..33c36f1 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -3203,14 +3203,14 @@ find_busiest_queue(struct sched_domain *sd, struct sched_group *group,
 		   const struct cpumask *cpus)
 {
 	struct rq *busiest = NULL, *rq;
-	unsigned long max_load = 0;
+	u64 max_load = 0;
 	int i;
 
 	for_each_cpu(i, sched_group_cpus(group)) {
 		unsigned long power = power_of(i);
 		unsigned long capacity = DIV_ROUND_CLOSEST(power,
 							   SCHED_POWER_SCALE);
-		unsigned long wl;
+		u64 wl;
 
 		if (!capacity)
 			capacity = fix_small_capacity(sd, group);
@@ -3234,7 +3234,7 @@ find_busiest_queue(struct sched_domain *sd, struct sched_group *group,
 		 * the load can be moved away from the cpu that is potentially
 		 * running at a lower capacity.
 		 */
-		wl = (wl * SCHED_POWER_SCALE) / power;
+		wl = div_u64(wl * SCHED_POWER_SCALE, power);
 
 		if (wl > max_load) {
 			max_load = wl;
-- 
1.7.3.1

--
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/