linux-kernel - Re: [PATCH v2 1/2] kernel/events: Add option to notify through signals on wakeup

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Message-ID: <20170804102018.u2zvnekjpjqdag7c@hirez.programming.kicks-ass.net>
Date:   Fri, 4 Aug 2017 12:20:18 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
Cc:     Jiri Olsa <jolsa@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Vince Weaver <vincent.weaver@...ne.edu>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] kernel/events: Add option to notify through
 signals on wakeup

On Tue, Aug 01, 2017 at 08:14:03PM +0530, Naveen N. Rao wrote:
> Add a new option 'signal_on_wakeup' to request for a signal to be
> delivered on ring buffer wakeup controlled through watermark and
> {wakeup_events, wakeup_watermark}. HUP is signaled on exit.

This fails to tell us why you'd want this. What is wrong with the
existing POLL_IN notification?