mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 17:08:10 +00:00
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>
58 lines
920 B
C
58 lines
920 B
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <stdio.h>
|
|
#include "pmu.h"
|
|
#include "topdown.h"
|
|
|
|
int topdown_filter_events(const char **attr, char **str, bool use_group)
|
|
{
|
|
int off = 0;
|
|
int i;
|
|
int len = 0;
|
|
char *s;
|
|
|
|
for (i = 0; attr[i]; i++) {
|
|
if (pmu_have_event("cpu", attr[i])) {
|
|
len += strlen(attr[i]) + 1;
|
|
attr[i - off] = attr[i];
|
|
} else
|
|
off++;
|
|
}
|
|
attr[i - off] = NULL;
|
|
|
|
*str = malloc(len + 1 + 2);
|
|
if (!*str)
|
|
return -1;
|
|
s = *str;
|
|
if (i - off == 0) {
|
|
*s = 0;
|
|
return 0;
|
|
}
|
|
if (use_group)
|
|
*s++ = '{';
|
|
for (i = 0; attr[i]; i++) {
|
|
strcpy(s, attr[i]);
|
|
s += strlen(s);
|
|
*s++ = ',';
|
|
}
|
|
if (use_group) {
|
|
s[-1] = '}';
|
|
*s = 0;
|
|
} else
|
|
s[-1] = 0;
|
|
return 0;
|
|
}
|
|
|
|
__weak bool arch_topdown_check_group(bool *warn)
|
|
{
|
|
*warn = false;
|
|
return false;
|
|
}
|
|
|
|
__weak void arch_topdown_group_warn(void)
|
|
{
|
|
}
|
|
|
|
__weak bool arch_topdown_sample_read(struct evsel *leader __maybe_unused)
|
|
{
|
|
return false;
|
|
}
|