perf record: Support sample-read topdown metric group

2020-09-17T18:47:58+00:00

With the hardware TopDown metrics feature, sample-read feature should be supported for a topdown group, e.g., sample a non-topdown event and read a topdown metric group. But the current perf record code errors out. For a topdown metric group, the slots event must be the leader of the group, but the leader slots event doesn't support sampling. To support sample-read the topdown metric group, use the 2nd event of the group as the "leader" for the purposes of sampling. Only the platform with Topdown metic feature supports sample-read the topdown group. Add arch_topdown_sample_read() to indicate whether the topdown group supports sample-read. Signed-off-by: Kan Liang Acked-by: Jiri Olsa Acked-by: Namhyung Kim Cc: Andi Kleen Cc: Peter Zijlstra Cc: Stephane Eranian Link: http://lore.kernel.org/lkml/20200911144808.27603-3-kan.liang@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Rename group to topdown

2020-09-17T18:47:55+00:00

The group.h/c only include TopDown group related functions. The name "group" is too generic and inaccurate. Use the name "topdown" to replace it. Move topdown related functions to a dedicated file, topdown.c. Signed-off-by: Kan Liang Acked-by: Jiri Olsa Acked-by: Namhyung Kim Cc: Andi Kleen Cc: Peter Zijlstra Cc: Stephane Eranian Link: http://lore.kernel.org/lkml/20200911144808.27603-2-kan.liang@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo

kernel/linux.git/tools/perf/util/topdown.c, branch v5.16

perf record: Support sample-read topdown metric group

perf tools: Rename group to topdown