linux-kernel - Re: [RFC PATCH 0/4] Gang scheduling in CFS

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:	Mon, 20 Feb 2012 11:51:13 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Nikunj A Dadhania <nikunj@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Avi Kivity <avi@...hat.com>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	vatsa@...ux.vnet.ibm.com, bharata@...ux.vnet.ibm.com
Subject: Re: [RFC PATCH 0/4] Gang scheduling in CFS

On Mon, 2012-02-20 at 13:38 +0530, Nikunj A Dadhania wrote:
> +#ifdef CONFIG_PARAVIRT_FLUSH_TLB
> +               while (!cpumask_empty(to_cpumask(f->flush_cpumask)) && --loop)
> +                       cpu_relax();
> +               if (!loop && !cpumask_empty(to_cpumask(f->flush_cpumask)))
> +                       halt();


That's just vile, you don't need to wait for it, all you need to make
sure is that when that vcpu wakes up it does the flush.

But yeah, the results are a good hint that you're on the right track.
--
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/