linux-kernel - Re: [PATCH v0.9.1 3/6] sched/umcg: implement UMCG syscalls

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Date:   Sat, 27 Nov 2021 01:45:20 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Peter Oskolkov <posk@...k.io>, Ingo Molnar <mingo@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-api@...r.kernel.org, Paul Turner <pjt@...gle.com>,
        Ben Segall <bsegall@...gle.com>,
        Peter Oskolkov <posk@...gle.com>,
        Andrei Vagin <avagin@...gle.com>, Jann Horn <jannh@...gle.com>,
        Thierry Delisle <tdelisle@...terloo.ca>
Subject: Re: [PATCH v0.9.1 3/6] sched/umcg: implement UMCG syscalls

On Fri, Nov 26 2021 at 22:59, Peter Zijlstra wrote:
> On Fri, Nov 26, 2021 at 10:08:14PM +0100, Thomas Gleixner wrote:
>> > +		if (timo)
>> > +			hrtimer_sleeper_start_expires(&timeout, HRTIMER_MODE_ABS);
>> > +
>> > +		freezable_schedule();
>> 
>> You can replace the whole hrtimer foo with
>> 
>>                 if (!schedule_hrtimeout_range_clock(timo ? &timo : NULL,
>>                                                     tsk->timer_slack_ns,
>>                                                     HRTIMER_MODE_ABS,
>>                                                     tsk->umcg_clock)) {
>>                 	ret = -ETIMEOUT;
>>                         break;
>>                 }
>
> That seems to loose the freezable crud.. then again, since we're
> interruptible, that shouldn't matter. Lemme go do that.

We could add a freezable wrapper for that if necessary.

Thanks,

        tglx