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acb65150a perf record: Support sample-read topdown metric group ... Browse Code »

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

Kan Liang
2020-09-18 02:47:58 +0800

topdown.h 312 Bytes

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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef TOPDOWN_H
#define TOPDOWN_H 1
#include "evsel.h"

bool arch_topdown_check_group(bool *warn);
void arch_topdown_group_warn(void);
bool arch_topdown_sample_read(struct evsel *leader);

int topdown_filter_events(const char **attr, char **str, bool use_group);

#endif