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
| ||
|
Date: Wed, 21 Sep 2022 06:48:43 -1000 From: Tejun Heo <tj@...nel.org> To: Qais Yousef <qais.yousef@....com> Cc: Vincent Guittot <vincent.guittot@...aro.org>, Dietmar Eggemann <dietmar.eggemann@....com>, mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com, rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de, bristot@...hat.com, vschneid@...hat.com, linux-kernel@...r.kernel.org, parth@...ux.ibm.com, chris.hyser@...cle.com, valentin.schneider@....com, patrick.bellasi@...bug.net, David.Laight@...lab.com, pjt@...gle.com, pavel@....cz, qperret@...gle.com, tim.c.chen@...ux.intel.com, joshdon@...gle.com Subject: Re: [PATCH v4 6/8] sched/fair: Add sched group latency support Hello, On Wed, Sep 21, 2022 at 05:07:38PM +0100, Qais Yousef wrote: > Wouldn't cpu.latency.nice be enough? I think the latency_offset is > implementation detail that userspace shouldn't be concerned about. One option could be just using the same mapping as cpu.weight so that 100 maps to neutral, 10000 maps close to -20, 1 maps close to 19. It isn't great that the value can't be interpreted in any intuitive way (e.g. a time duration based interface would be a lot easier to grok even if it still is best effort) but if that's what the per-task interface is gonna be, it'd be best to keep cgroup interface in line. As for whether a single value would fit the bill, it's again something which should be answered for both task and cgroup based interface at the same time. That said, my not-too-throught-through opinion is that a single value for per-task / per-cgroup interface + system level knobs to fine tune how that actually applies is likely enough and probably better than exposing exposing a host of internal details to applications directly. Thanks. -- tejun
Powered by blists - more mailing lists