perf pmu: Improve error messages for missing PMUs

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When a PMU is missing print a better error message mentioning
the missing PMU.

% mkdir empty
% mount --bind empty /sys/devices/msr
% perf stat -M Summary true
event syntax error: '{inst_retired.any,cycles}:W,{cpu_clk_unhalted.thread}:W,{inst_retired.any}:W,{cpu_clk_unhalted.ref_tsc,msr/tsc/}:W,{fp_comp_ops_exe.sse_scalar..'
                     \___ Cannot find PMU `msr'. Missing kernel support?

It still cannot find the right column for aliases, but it's already a vast improvement.

v2: Check asprintf

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/20170913215006.32222-1-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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This commit is contained in:

Andi Kleen 2017-09-13 14:50:06 -07:00 • committed by Arnaldo Carvalho de Melo

parent 75e45e4320

commit 333b566559

3 changed files with 16 additions and 7 deletions

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2

tools/perf/util/metricgroup.c

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18

tools/perf/util/parse-events.c

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3

tools/perf/util/parse-events.h

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