linux-kernel - Re: [PATCH 18/19] sched: prctl() core-scheduling interface

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Message-ID: <YQwZGjjugfJTV2s6@hirez.programming.kicks-ass.net>
Date:   Thu, 5 Aug 2021 19:00:10 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Eugene Syromiatnikov <esyr@...hat.com>
Cc:     joel@...lfernandes.org, chris.hyser@...cle.com, joshdon@...gle.com,
        mingo@...nel.org, vincent.guittot@...aro.org,
        valentin.schneider@....com, mgorman@...e.de,
        linux-kernel@...r.kernel.org, tglx@...utronix.de,
        linux-api@...r.kernel.org, ldv@...ace.io
Subject: Re: [PATCH 18/19] sched: prctl() core-scheduling interface

On Thu, Aug 05, 2021 at 06:53:19PM +0200, Eugene Syromiatnikov wrote:
> On Thu, Apr 22, 2021 at 02:05:17PM +0200, Peter Zijlstra wrote:
> > API:
> > 
> >   prctl(PR_SCHED_CORE, PR_SCHED_CORE_GET, tgtpid, pidtype, &cookie)
> >   prctl(PR_SCHED_CORE, PR_SCHED_CORE_CREATE, tgtpid, pidtype, NULL)
> >   prctl(PR_SCHED_CORE, PR_SCHED_CORE_SHARE_TO, tgtpid, pidtype, NULL)
> >   prctl(PR_SCHED_CORE, PR_SCHED_CORE_SHARE_FROM, srcpid, pidtype, NULL)
> > 
> > where 'tgtpid/srcpid == 0' implies the current process and pidtype is
> > kernel enum pid_type {PIDTYPE_PID, PIDTYPE_TGID, PIDTYPE_PGID, ...}.
> 
> It means that enum pid_tipe has to be a part of UAPI now.  Would you
> like to address it, or rather I'd send a patch?

Please send a patch; I'm more sparse than usual atm.