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perf metricgroup: Support metric constraint 

Some metric groups have metric constraints. A metric group can be
scheduled as a group only when some constraints are applied.  For
example, Page_Walks_Utilization has a metric constraint,
"NO_NMI_WATCHDOG".

When NMI watchdog is disabled, the metric group can be scheduled as a
group. Otherwise, splitting the metric group into standalone metrics.

Add a new function, metricgroup__has_constraint(), to check whether all
constraints are applied. If not, splitting the metric group into
standalone metrics.

Currently, only one constraint, "NO_NMI_WATCHDOG", is checked. Print a
warning for the metric group with the constraint, when NMI WATCHDOG is
enabled.

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Link: http://lore.kernel.org/lkml/1582581564-184429-5-git-send-email-kan.liang@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Kan Liang 2020-02-24 13:59:23 -08:00 committed by Arnaldo Carvalho de Melo
parent 2a14c1bf01
commit ab483d8bc8
1 changed files with 53 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

54
tools/perf/util/metricgroup.c
View File

@ -22,6 +22,8 @@
#include <linux/string.h>
#include <linux/zalloc.h>
#include <subcmd/parse-options.h>
#include <api/fs/fs.h>
#include "util.h"
struct metric_event *metricgroup__lookup(struct rblist *metric_events,
struct evsel *evsel,
@ -429,6 +431,49 @@ static void metricgroup__add_metric_weak_group(struct strbuf *events,
strbuf_addf(events, "}:W");
}
static void metricgroup__add_metric_non_group(struct strbuf *events,
const char **ids,
int idnum)
{
int i;
for (i = 0; i < idnum; i++)
strbuf_addf(events, ",%s", ids[i]);
}
static void metricgroup___watchdog_constraint_hint(const char *name, bool foot)
{
static bool violate_nmi_constraint;
if (!foot) {
pr_warning("Splitting metric group %s into standalone metrics.\n", name);
violate_nmi_constraint = true;
return;
}
if (!violate_nmi_constraint)
return;
pr_warning("Try disabling the NMI watchdog to comply NO_NMI_WATCHDOG metric constraint:\n"
" echo 0 > /proc/sys/kernel/nmi_watchdog\n"
" perf stat ...\n"
" echo 1 > /proc/sys/kernel/nmi_watchdog\n");
}
static bool metricgroup__has_constraint(struct pmu_event *pe)
{
if (!pe->metric_constraint)
return false;
if (!strcmp(pe->metric_constraint, "NO_NMI_WATCHDOG") &&
sysctl__nmi_watchdog_enabled()) {
metricgroup___watchdog_constraint_hint(pe->metric_name, false);
return true;
}
return false;
}
static int metricgroup__add_metric(const char *metric, struct strbuf *events,
struct list_head *group_list)
{
@ -460,7 +505,10 @@ static int metricgroup__add_metric(const char *metric, struct strbuf *events,
if (events->len > 0)
strbuf_addf(events, ",");
metricgroup__add_metric_weak_group(events, ids, idnum);
if (metricgroup__has_constraint(pe))
metricgroup__add_metric_non_group(events, ids, idnum);
else
metricgroup__add_metric_weak_group(events, ids, idnum);
eg = malloc(sizeof(struct egroup));
if (!eg) {
@ -502,6 +550,10 @@ static int metricgroup__add_metric_list(const char *list, struct strbuf *events,
}
}
free(nlist);
if (!ret)
metricgroup___watchdog_constraint_hint(NULL, true);
return ret;
}