From: "Yan, Zheng" <zheng.z.yan@intel.com>
To: Stephane Eranian <eranian@google.com>,
Andy Lutomirski <luto@amacapital.net>
Cc: LKML <linux-kernel@vger.kernel.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Ingo Molnar <mingo@kernel.org>,
Arnaldo Carvalho de Melo <acme@infradead.org>,
Andi Kleen <andi@firstfloor.org>
Subject: Re: [PATCH v3 00/14] perf, x86: Haswell LBR call stack support
Date: Wed, 26 Feb 2014 16:57:02 +0800 [thread overview]
Message-ID: <530DAC5E.20408@intel.com> (raw)
In-Reply-To: <CABPqkBSECV6iG4T60-OTZsV2CrCtV=awUSt7SGLTdkX9i8T90g@mail.gmail.com>
On 02/26/2014 03:04 PM, Stephane Eranian wrote:
> On Wed, Feb 26, 2014 at 3:39 AM, Andy Lutomirski <luto@amacapital.net> wrote:
>> On 02/17/2014 10:07 PM, Yan, Zheng wrote:
>>>
>>> This patch series adds LBR call stack support. User can enabled/disable
>>> this through an sysfs attribute file in the CPU PMU directory:
>>> echo 1 > /sys/bus/event_source/devices/cpu/lbr_callstack
>>
>> This seems like an unpleasant way to control this. It would be handy to
>> be able to control this as an option to perf record.
>>
> That would mean you'd be root for perf.
> Or are you suggesting a perf event option? But then, you'd expose arch-specific
> feature at the API level.
>
Another option is enable this feature by default if hardware supports it. But it
causes LBR contention between events that want callstack and evnets that want LBR.
Regards
Yan, Zheng
next prev parent reply other threads:[~2014-02-26 9:00 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-18 6:07 [PATCH v3 00/14] perf, x86: Haswell LBR call stack support Yan, Zheng
2014-02-18 6:07 ` [PATCH v3 01/14] perf, x86: Reduce lbr_sel_map size Yan, Zheng
2014-02-18 6:07 ` [PATCH v3 02/14] perf, core: introduce pmu context switch callback Yan, Zheng
2014-02-18 6:07 ` [PATCH v3 03/14] perf, x86: use context switch callback to flush LBR stack Yan, Zheng
2014-02-18 6:07 ` [PATCH v3 04/14] perf, x86: Basic Haswell LBR call stack support Yan, Zheng
2014-02-18 6:07 ` [PATCH v3 05/14] perf, core: pmu specific data for perf task context Yan, Zheng
2014-02-18 6:07 ` [PATCH v3 06/14] perf, core: always switch pmu specific data during context switch Yan, Zheng
2014-02-18 6:07 ` [PATCH v3 07/14] perf, x86: track number of events that use LBR callstack Yan, Zheng
2014-02-18 6:07 ` [PATCH v3 08/14] perf, x86: allocate space for storing LBR stack Yan, Zheng
2014-02-18 6:07 ` [PATCH v3 09/14] perf, x86: Save/resotre LBR stack during context switch Yan, Zheng
2014-02-18 6:07 ` [PATCH v3 10/14] perf, core: simplify need branch stack check Yan, Zheng
2014-02-18 6:07 ` [PATCH v3 11/14] perf, core: Pass perf_sample_data to perf_callchain() Yan, Zheng
2014-02-18 6:07 ` [PATCH v3 12/14] perf, x86: use LBR call stack to get user callchain Yan, Zheng
2014-02-18 6:07 ` [PATCH v3 13/14] perf, x86: enable LBR callstack when recording callchain Yan, Zheng
2014-02-18 6:07 ` [PATCH v3 14/14] perf, x86: Discard zero length call entries in LBR call stack Yan, Zheng
2014-02-23 19:47 ` [PATCH v3 00/14] perf, x86: Haswell LBR call stack support Stephane Eranian
2014-02-24 1:07 ` Yan, Zheng
2014-02-24 7:14 ` Peter Zijlstra
2014-02-26 2:39 ` Andy Lutomirski
2014-02-26 7:04 ` Stephane Eranian
2014-02-26 8:57 ` Yan, Zheng [this message]
2014-02-26 16:03 ` Andy Lutomirski
2014-02-26 18:55 ` Andi Kleen
2014-02-26 18:59 ` Andy Lutomirski
2014-02-26 19:19 ` David Ahern
2014-02-26 19:25 ` Andy Lutomirski
2014-02-26 20:14 ` David Ahern
2014-02-26 20:26 ` Andy Lutomirski
2014-04-09 11:48 ` Peter Zijlstra
2014-04-09 16:48 ` Andi Kleen
2014-04-09 17:40 ` Andi Kleen
2014-02-26 20:32 ` Peter Zijlstra
2014-02-26 20:53 ` Andi Kleen
2014-02-26 21:15 ` Peter Zijlstra
2014-02-26 21:33 ` Andi Kleen
2014-02-26 21:34 ` David Ahern
2014-02-26 21:42 ` Andi Kleen
2014-02-27 9:09 ` Stephane Eranian
2014-02-27 12:35 ` Ingo Molnar
2014-02-27 16:08 ` Andi Kleen
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