iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
d57da8c9a5
linux/tools/perf/arch
History
Kan Liang 91a8c5b840 perf intel-pt: Always set no branch for dummy event 
An earlier kernel patch allowed enabling PT and LBR at the same time on
Goldmont.

commit ccbebba4c6 ("perf/x86/intel/pt: Bypass PT vs. LBR exclusivity
if the core supports it")

However, users still cannot use Intel PT and LBRs simultaneously.  $
sudo perf record -e cycles,intel_pt//u -b  -- sleep 1 Error: PMU
Hardware doesn't support sampling/overflow-interrupts.

PT implicitly adds dummy event in perf tool. dummy event is software
event which doesn't support LBR.

Always setting no branch for dummy event in Intel PT.

Signed-off-by: Kan Liang <kan.liang@intel.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20170630141656.1626-2-kan.liang@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2017-07-20 09:55:51 -03:00
..
alpha perf tools: Add empty Build files for architectures lacking them 2015-08-06 16:24:15 -03:00
arm perf coresight: Remove superfluous check before use 2017-06-19 15:27:08 -03:00
arm64 perf annotate: Fix AArch64 comment char 2017-05-04 10:03:00 -03:00
mips perf tools: Add empty Build files for architectures lacking them 2015-08-06 16:24:15 -03:00
parisc perf tools: Add empty Build files for architectures lacking them 2015-08-06 16:24:15 -03:00
powerpc perf probe: Allow placing uprobes in alternate namespaces. 2017-07-18 23:14:10 -03:00
s390 perf tools: Include errno.h where needed 2017-04-19 13:01:51 -03:00
sh perf probe: Support probing on offline cross-arch binary 2016-09-01 12:41:09 -03:00
sparc perf probe: Support probing on offline cross-arch binary 2016-09-01 12:41:09 -03:00
x86 perf intel-pt: Always set no branch for dummy event 2017-07-20 09:55:51 -03:00
xtensa perf probe: Support probing on offline cross-arch binary 2016-09-01 12:41:09 -03:00
Build perf tools: Fix build with ARCH=x86_64 2017-06-14 15:44:29 -03:00
common.c perf annotate: Add missing powerpc triplet 2017-06-05 14:18:02 -03:00
common.h perf tools: Export normalize_arch() function 2016-06-07 12:08:53 -03:00