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acb65150a4
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>
59 lines
920 B
C
59 lines
920 B
C
// SPDX-License-Identifier: GPL-2.0
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#include <stdio.h>
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#include "pmu.h"
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#include "topdown.h"
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int topdown_filter_events(const char **attr, char **str, bool use_group)
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{
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int off = 0;
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int i;
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int len = 0;
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char *s;
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for (i = 0; attr[i]; i++) {
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if (pmu_have_event("cpu", attr[i])) {
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len += strlen(attr[i]) + 1;
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attr[i - off] = attr[i];
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} else
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off++;
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}
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attr[i - off] = NULL;
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*str = malloc(len + 1 + 2);
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if (!*str)
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return -1;
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s = *str;
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if (i - off == 0) {
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*s = 0;
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return 0;
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}
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if (use_group)
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*s++ = '{';
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for (i = 0; attr[i]; i++) {
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strcpy(s, attr[i]);
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s += strlen(s);
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*s++ = ',';
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}
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if (use_group) {
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s[-1] = '}';
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*s = 0;
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} else
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s[-1] = 0;
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return 0;
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}
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__weak bool arch_topdown_check_group(bool *warn)
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{
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*warn = false;
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return false;
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}
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__weak void arch_topdown_group_warn(void)
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{
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}
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__weak bool arch_topdown_sample_read(struct evsel *leader __maybe_unused)
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{
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return false;
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}
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