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

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Message-ID: <20211124215834.GI721624@worktop.programming.kicks-ass.net>
Date:   Wed, 24 Nov 2021 22:58:34 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Peter Oskolkov <posk@...k.io>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>, linux-mm@...ck.org,
        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 Mon, Nov 22, 2021 at 01:13:24PM -0800, Peter Oskolkov wrote:
> +	if (abs_timeout) {
> +		hrtimer_init_sleeper_on_stack(&timeout, CLOCK_REALTIME,
> +				HRTIMER_MODE_ABS);

Using CLOCK_REALTIME timers while the rest of the thing runs off of
CLOCK_MONOTONIC doesn't seem to make sense to me. Why would you want to
have timeouts subject to DST shifts and crap like that?