linux-kernel - Re: [RFC][PATCH v2 5/5] sched: User Mode Concurency Groups

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Date:   Mon, 24 Jan 2022 09:06:29 -0800
From:   Peter Oskolkov <posk@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     mingo@...hat.com, tglx@...utronix.de, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-api@...r.kernel.org, x86@...nel.org,
        pjt@...gle.com, avagin@...gle.com, jannh@...gle.com,
        tdelisle@...terloo.ca, mark.rutland@....com, posk@...k.io
Subject: Re: [RFC][PATCH v2 5/5] sched: User Mode Concurency Groups

On Mon, Jan 24, 2022 at 8:44 AM Peter Zijlstra <peterz@...radead.org> wrote:

[...]
> >
> > Oh how I hate signals... this can get scribbled by a syscall/fault from
> > sigcontext :/
> >
> > Maybe I can recover the timo argument from the original syscall
> > pt_regs.. let me try.

I don't think we need to do anything special with timeouts if a signal
happens - just normally return -EINTR (after a resume from a server)
and let the userspace figure things out.

Alternatively, in my version of the patchset UMCG tasks ignore
non-fatal signals. :)

[...]