linux-kernel - Re: [RFC 00/10] perf pollfd series

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Message-ID: <20140825110431.GC11611@krava.brq.redhat.com>
Date:	Mon, 25 Aug 2014 13:04:31 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Adrian Hunter <adrian.hunter@...el.com>,
	Borislav Petkov <bp@...e.de>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	David Ahern <dsahern@...il.com>,
	Don Zickus <dzickus@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Jean Pihet <jean.pihet@...aro.org>,
	Mike Galbraith <efault@....de>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [RFC 00/10] perf pollfd series

On Fri, Aug 22, 2014 at 05:59:40PM -0300, Arnaldo Carvalho de Melo wrote:
> Hi,
> 
> 	This is an alternative series to the one Jiri Olsa posted to use the
> fixes he made to the kernel side to allow tooling to notice that a thread had
> exited by looking at the pollfd.revents looking for POLLHUP notifications.
> 
> 	Once all event file descriptors are removed from the evlist pollfd array,
> tools can make a decision about exiting or telling the user about what happened,
> asking to guidance on what to do next.
> 
> 	The main difference in this approach is that a new class, which Jiri
> called 'poller' and I called 'fdarray', grew up from what was in evlist->pollfd
> and associated operations, while Jiri first introduced a new class and then
> made tooling use it.
> 
> 	The details of the implementation should be clear on the changelog
> comments, please let me know if you see any problems, and if I can have your
> acked-by/tested-by/whatever-else tags to get this moving forward.
> 
> 	Ah, there is still one missing thing which is to make the hists browser
> in live mode be notified that all monitored events are POLLHUP'ed, will get
> to that in followup patches.
> 
> 	The kernel bits were sent together with my latest pull req to Ingo,
> this series is on top of that branch and is available at:
> 
>  git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git perf/pollfd
> 
> - Arnaldo
> 
> Arnaldo Carvalho de Melo (10):
>   perf evlist: Introduce perf_evlist__filter_pollfd method
>   perf tests: Add test for perf_evlist__filter_pollfd()
>   perf evlist: Monitor POLLERR and POLLHUP events too
>   perf record: Filter out POLLHUP'ed file descriptors
>   perf trace: Filter out POLLHUP'ed file descriptors
>   perf evlist: Allow growing pollfd on add method
>   perf tests: Add pollfd growing test
>   perf kvm stat live: Use perf_evlist__add_pollfd() instead of local equivalent
>   perf evlist: Introduce poll method for common code idiom
>   tools lib api: Adopt fdarray class from perf's evlist

fdarray name seems too generic for this object, fdpoll looks
more suitable.. also given that the file name is poll.[ch] ;-)

anyway, except for what I've already commented:

Acked-by: Jiri Olsa <jolsa@...nel.org>

jirka
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