linux-kernel - Re: [PATCH 3/7] RT: Only consider online CPUs when pushing rt tasks

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: <Pine.LNX.4.58.0710120809490.8900@gandalf.stny.rr.com>
Date:	Fri, 12 Oct 2007 08:10:50 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Gregory Haskins <ghaskins@...ell.com>
cc:	Peter Zijlstra <peterz@...radead.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/7] RT: Only consider online CPUs when pushing rt tasks


--

On Thu, 11 Oct 2007, Gregory Haskins wrote:

> task->cpus_allowed can have bit positions that are set for CPUs that are
> not currently online.  So we optimze our search by ANDing against the online
> set.
>
> Signed-off-by: Gregory Haskins <ghaskins@...ell.com>
> ---
>
>  kernel/sched.c |    6 +++++-
>  1 files changed, 5 insertions(+), 1 deletions(-)
>
> diff --git a/kernel/sched.c b/kernel/sched.c
> index 24b38b4..0ca3905 100644
> --- a/kernel/sched.c
> +++ b/kernel/sched.c
> @@ -1510,10 +1510,14 @@ static int push_rt_task(struct rq *this_rq)
>
>  	/* Only try this algorithm three times */
>  	for (tries = 0; tries < 3; tries++) {
> +		cpumask_t mask;
> +
> +		cpus_and(mask, cpu_online_map, next_task->cpus_allowed);
> +

Gag! I definitely sent you an old patch. I fixed this a while ago :-(

-- Steve

>  		/*
>  		 * Scan each rq for the lowest prio.
>  		 */
> -		for_each_cpu_mask(cpu, next_task->cpus_allowed) {
> +		for_each_cpu_mask(cpu, mask) {
>  			struct rq *rq = &per_cpu(runqueues, cpu);
>
>  			if (cpu == smp_processor_id())
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>
>
>
-
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/