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// SPDX-License-Identifier: GPL-2.0
#include <stdio.h>
#include "api/fs/fs.h"
#include "util/pmu.h"
#include "util/topdown.h"
#include "topdown.h"
#include "evsel.h"
/* Check whether there is a PMU which supports the perf metrics. */
bool topdown_sys_has_perf_metrics(void)
{
static bool has_perf_metrics;
static bool cached;
struct perf_pmu *pmu;
if (cached)
return has_perf_metrics;
/*
* The perf metrics feature is a core PMU feature.
* The PERF_TYPE_RAW type is the type of a core PMU.
* The slots event is only available when the core PMU
* supports the perf metrics feature.
*/
pmu = perf_pmu__find_by_type(PERF_TYPE_RAW);
if (pmu && pmu_have_event(pmu->name, "slots"))
has_perf_metrics = true;
cached = true;
return has_perf_metrics;
}
/*
* Check whether we can use a group for top down.
* Without a group may get bad results due to multiplexing.
*/
bool arch_topdown_check_group(bool *warn)
{
int n;
if (sysctl__read_int("kernel/nmi_watchdog", &n) < 0)
return false;
if (n > 0) {
*warn = true;
return false;
}
return true;
}
void arch_topdown_group_warn(void)
{
fprintf(stderr,
"nmi_watchdog enabled with topdown. May give wrong results.\n"
"Disable with echo 0 > /proc/sys/kernel/nmi_watchdog\n");
}
#define TOPDOWN_SLOTS 0x0400
/*
* Check whether a topdown group supports sample-read.
*
* Only Topdown metric supports sample-read. The slots
* event must be the leader of the topdown group.
*/
bool arch_topdown_sample_read(struct evsel *leader)
{
if (!evsel__sys_has_perf_metrics(leader))
return false;
if (leader->core.attr.config == TOPDOWN_SLOTS)
return true;
return false;
}
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