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Date:   Thu, 5 Aug 2021 19:00:10 +0200
From:   Peter Zijlstra <peterz@infradead.org>
To:     Eugene Syromiatnikov <esyr@redhat.com>
Cc:     joel@joelfernandes.org, chris.hyser@oracle.com, joshdon@google.com,
        mingo@kernel.org, vincent.guittot@linaro.org,
        valentin.schneider@arm.com, mgorman@suse.de,
        linux-kernel@vger.kernel.org, tglx@linutronix.de,
        linux-api@vger.kernel.org, ldv@strace.io
Subject: Re: [PATCH 18/19] sched: prctl() core-scheduling interface
Message-ID: <YQwZGjjugfJTV2s6@hirez.programming.kicks-ass.net>
References: <20210422120459.447350175@infradead.org>
 <20210422123309.039845339@infradead.org>
 <20210805165319.GA5916@asgard.redhat.com>
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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.