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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 <kan.liang@linux.intel.com> Acked-by: Jiri Olsa <jolsa@redhat.com> Acked-by: Namhyung Kim <namhyung@kernel.org> Cc: Andi Kleen <ak@linux.intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lore.kernel.org/lkml/20200911144808.27603-3-kan.liang@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
12 lines
312 B
C
12 lines
312 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef TOPDOWN_H
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#define TOPDOWN_H 1
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#include "evsel.h"
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bool arch_topdown_check_group(bool *warn);
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void arch_topdown_group_warn(void);
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bool arch_topdown_sample_read(struct evsel *leader);
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int topdown_filter_events(const char **attr, char **str, bool use_group);
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#endif
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