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, 11 Apr 2019 11:19:10 +0200
From:   Peter Zijlstra <>
To:     Aaron Lu <>
Cc:     Tim Chen <>,,,,,,,,,,
        Aubrey Li <>,
        Julien Desfossez <>
Subject: Re: [RFC][PATCH 13/16] sched: Add core wide task selection and

On Thu, Apr 11, 2019 at 11:05:41AM +0800, Aaron Lu wrote:
> On Wed, Apr 10, 2019 at 04:44:18PM +0200, Peter Zijlstra wrote:
> > When core_cookie==0 we shouldn't schedule the other siblings at all.
> Not even with another untagged task?
> I was thinking to leave host side tasks untagged, like kernel threads,
> init and other system daemons or utilities etc., and tenant tasks tagged.
> Then at least two untagged tasks can be scheduled on the same core.
> Kindly let me know if you see a problem with this.

Let me clarify; when the rq->core->core_cookie == 0, each sibling should
schedule independently.

As Julien found, there were some issues here, but the intent was:

  core_cookie 0, independent scheduling
  core_cookie 0->n, core scheduling
  core_cookie n->0, one last core schedule to kick possibly forced idle siblings

Powered by blists - more mailing lists