linux-kernel - Re: [patch] CFS scheduler, -v18

lists.openwall.net		lists / announce john-users owl-users popa3d-users / xvendor oss-security / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4
Open Source and information security mailing list archives

Order Openwall GNU/*/Linux 2.0 on a CD with delivery worldwide

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

Date:	Sun, 1 Jul 2007 10:45:01 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Willy Tarreau <w@....eu>
Subject: Re: [patch] CFS scheduler, -v18


Willy,

could you check whether your current v18 CFS tree has the fix below 
included? I discovered it right after having released v18 so i updated 
the v18 files in place - but maybe you downloaded an early version? I 
thought it's relatively harmless, that it would only affect SCHED_IDLE 
tasks, but maybe it affects nice +19 tasks too on your box!

	Ingo

Index: linux/kernel/sched_fair.c
===================================================================
--- linux.orig/kernel/sched_fair.c
+++ linux/kernel/sched_fair.c
@@ -342,8 +342,9 @@ update_stats_enqueue(struct cfs_rq *cfs_
 		s64 tmp;
 
 		if (se->wait_runtime < 0) {
-			tmp = (0 - se->wait_runtime) << NICE_0_SHIFT;
-			key += (tmp * se->load.inv_weight) >> WMULT_SHIFT;
+			tmp = -se->wait_runtime;
+			key += (tmp * se->load.inv_weight) >>
+					(WMULT_SHIFT - NICE_0_SHIFT);
 		} else {
 			tmp = se->wait_runtime * se->load.weight;
 			key -= tmp >> NICE_0_SHIFT;
-
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/