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

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Message-ID: <alpine.DEB.2.20.1708031355400.26654@macbook-air>
Date:   Thu, 3 Aug 2017 13:57:33 -0400 (EDT)
From:   Vince Weaver <vincent.weaver@...ne.edu>
To:     "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
cc:     Peter Zijlstra <peterz@...radead.org>,
        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, 1 Aug 2017, 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.
> 
> Setting signal_on_wakeup disables use of IOC_REFRESH to control signal
> delivery, instead relying on IOC_ENABLE/DISABLE.

so I probably missed the original thread on this new interface, but why is 
IOC_REFRESH not being used?

For new interfaces like this it's also nice to have some text that can be 
added to the perf_event_open() manpage, especially if there's weird 
conditions like this.

Vince