linux-kernel - [RFC][Patch 15/18] sched: update h

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]

Date:	Wed, 20 Apr 2011 13:51:34 -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 15/18] sched: update h_load to use u64

Calculate tg->h_load using u64 to handle u64 load weights.

Signed-off-by: Nikhil Rao <ncrao@...gle.com>
---
 kernel/sched.c |   12 +++++++-----
 1 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index 8047f10..7c1f3fc 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -354,7 +354,7 @@ struct cfs_rq {
 	 * Where f(tg) is the recursive weight fraction assigned to
 	 * this group.
 	 */
-	unsigned long h_load;
+	u64 h_load;
 
 	/*
 	 * Maintaining per-cpu shares distribution for group scheduling
@@ -1541,15 +1541,17 @@ static unsigned long cpu_avg_load_per_task(int cpu)
  */
 static int tg_load_down(struct task_group *tg, void *data)
 {
-	unsigned long load;
+	u64 load;
 	long cpu = (long)data;
 
 	if (!tg->parent) {
 		load = cpu_rq(cpu)->load.weight;
 	} else {
-		load = tg->parent->cfs_rq[cpu]->h_load;
-		load *= tg->se[cpu]->load.weight;
-		load /= tg->parent->cfs_rq[cpu]->load.weight + 1;
+		u64 parent_h_load = tg->parent->cfs_rq[cpu]->h_load;
+		u64 parent_weight = tg->parent->cfs_rq[cpu]->load.weight;
+
+		load = div64_u64(parent_h_load * tg->se[cpu]->load.weight,
+				 parent_weight + 1);
 	}
 
 	tg->cfs_rq[cpu]->h_load = load;
-- 
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/