linux-kernel - Re: [GIT PULL 00/30] perf/core improvements and fixes

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Date:	Mon, 11 May 2015 14:09:39 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Adrian Hunter <adrian.hunter@...el.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Borislav Petkov <bp@...e.de>, David Ahern <dsahern@...il.com>,
	Davidlohr Bueso <dbueso@...e.de>,
	Deng-Cheng Zhu <dengcheng.zhu@...il.com>,
	Don Zickus <dzickus@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Hemant Kumar <hemant@...ux.vnet.ibm.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	"Naveen N . Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Stephane Eranian <eranian@...gle.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [GIT PULL 00/30] perf/core improvements and fixes

Hi Arnaldo,

On Fri, May 08, 2015 at 05:56:12PM -0300, Arnaldo Carvalho de Melo wrote:
> Hi Ingo,
> 
> 	Please consider pulling,
> 
> - Arnaldo
> 
> 
> 
> The following changes since commit cb307113746b4d184155d2c412e8069aeaa60d42:
> 
>   perf_event: Don't allow vmalloc() backed perf on powerpc (2015-05-08 12:26:01 +0200)
> 
> are available in the git repository at:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git tags/perf-core-for-mingo
> 
> for you to fetch changes up to 76d408498b08447e0f61dfdd611aeb6e8e61ce80:
> 
>   perf build: Disable libdw DWARF unwind when built with NO_DWARF (2015-05-08 16:43:14 -0300)
> 
> ----------------------------------------------------------------
> perf/core improvements and fixes:
> 
> User visible:
> 
> - 'perf probe' improvements (Masami Hiramatsu)
> 
>   - Support glob wildcards for function name
>   - Support $params special probe argument: Collect all function arguments
>   - Make --line checks validate C-style function name.
>   - Add --no-inlines option to avoid searching inline functions
> 
> - Introduce new 'perf bench futex' benchmark: 'wake-parallel', to
>   measure parallel waker threads generating contention for kerne
>   locks (hb->lock) (Davidlohr Bueso)
> 
> Bug fixes:
> 
> - 'perf top' survives much longer on high core count machines, more work
>   needed to refcount more data structures besides 'struct thread' and fix
>   more races (Arnaldo Carvalho de Melo)

I'm seeing a segfault on 'perf report' with a large data file after
applying thread refcount change - it happens regardless of the atomic
operation.

Thanks,
Namhyung
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