Re: [PATCH V4 14/16] perf, x86: enable LBR callstack when recording callchain

2014-06-30 Thread Andi Kleen
On Mon, Jun 30, 2014 at 04:50:51PM +0800, Yan, Zheng wrote: > If a task specific event wants user space callchain but does not want > branch stack sampling, enable the LBR call stack facility implicitly. > The LBR call stack facility can help perf to get user space callchain > in case of there is

[PATCH V4 14/16] perf, x86: enable LBR callstack when recording callchain

2014-06-30 Thread Yan, Zheng
If a task specific event wants user space callchain but does not want branch stack sampling, enable the LBR call stack facility implicitly. The LBR call stack facility can help perf to get user space callchain in case of there is no frame pointer. Note: this feature only affects how to get user

[PATCH V4 14/16] perf, x86: enable LBR callstack when recording callchain

2014-06-30 Thread Yan, Zheng
If a task specific event wants user space callchain but does not want branch stack sampling, enable the LBR call stack facility implicitly. The LBR call stack facility can help perf to get user space callchain in case of there is no frame pointer. Note: this feature only affects how to get user

Re: [PATCH V4 14/16] perf, x86: enable LBR callstack when recording callchain

2014-06-30 Thread Andi Kleen
On Mon, Jun 30, 2014 at 04:50:51PM +0800, Yan, Zheng wrote: If a task specific event wants user space callchain but does not want branch stack sampling, enable the LBR call stack facility implicitly. The LBR call stack facility can help perf to get user space callchain in case of there is no

[PATCH v4 14/16] perf, x86: enable LBR callstack when recording callchain

2014-03-17 Thread Yan, Zheng
If a task specific event wants user space callchain but does not want branch stack sampling, enable the LBR call stack facility implicitly. The LBR call stack facility can help perf to get user space callchain in case of there is no frame pointer. Note: this feature only affects how to get user

[PATCH v4 14/16] perf, x86: enable LBR callstack when recording callchain

2014-03-17 Thread Yan, Zheng
If a task specific event wants user space callchain but does not want branch stack sampling, enable the LBR call stack facility implicitly. The LBR call stack facility can help perf to get user space callchain in case of there is no frame pointer. Note: this feature only affects how to get user