linux-kernel - Re: [RFC 00/60] Coscheduling for Linux

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:   Thu, 18 Oct 2018 17:26:26 -0700
From:   Subhra Mazumdar <subhra.mazumdar@...cle.com>
To:     Jan H. Schönherr <jschoenh@...zon.de>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [RFC 00/60] Coscheduling for Linux

Hi Jan,

On 9/7/18 2:39 PM, Jan H. Schönherr wrote:
> The collective context switch from one coscheduled set of tasks to another
> -- while fast -- is not atomic. If a use-case needs the absolute guarantee
> that all tasks of the previous set have stopped executing before any task
> of the next set starts executing, an additional hand-shake/barrier needs to
> be added.
>
Do you know how much is the delay? i.e what is overlap time when a thread
of new group starts executing on one HT while there is still thread of
another group running on the other HT?

Thanks,
Subhra