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37932c188e
Add generic infrastructure to perf stat to output ratios for
"MetricExpr" entries in the event lists. Many events are more useful as
ratios than in raw form, typically some count in relation to total
ticks.
Transfer the MetricExpr information from the alias to the evsel.
We mark the events that need to be collected for MetricExpr, and also
link the events using them with a pointer. The code is careful to always
prefer the right event in the same group to minimize multiplexing
errors. At the moment only a single relation is supported.
Then add a rblist to the stat shadow code that remembers stats based on
the cpu and context.
Then finally update and retrieve and print these values similarly to the
existing hardcoded perf metrics. We use the simple expression parser
added earlier to evaluate the expression.
Normally we just output the result without further commentary, but for
--metric-only this would lead to empty columns. So for this case use the
original event as description.
There is no attempt to automatically add the MetricExpr event, if it is
missing, however we suggest it to the user, because the user tool
doesn't have enough information to reliably construct a group that is
guaranteed to schedule. So we leave that to the user.
% perf stat -a -I 1000 -e '{unc_p_clockticks,unc_p_freq_max_os_cycles}'
1.000147889 800,085,181 unc_p_clockticks
1.000147889 93,126,241 unc_p_freq_max_os_cycles # 11.6
2.000448381 800,218,217 unc_p_clockticks
2.000448381 142,516,095 unc_p_freq_max_os_cycles # 17.8
3.000639852 800,243,057 unc_p_clockticks
3.000639852 162,292,689 unc_p_freq_max_os_cycles # 20.3
% perf stat -a -I 1000 -e '{unc_p_clockticks,unc_p_freq_max_os_cycles}' --metric-only
# time freq_max_os_cycles %
1.000127077 0.9
2.000301436 0.7
3.000456379 0.0
v2: Change from DivideBy to MetricExpr
v3: Use expr__ prefix. Support more than one other event.
v4: Update description
v5: Only print warning message once for multiple PMUs.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/20170320201711.14142-11-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
92 lines
2.6 KiB
C
92 lines
2.6 KiB
C
#ifndef __PMU_H
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#define __PMU_H
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#include <linux/bitmap.h>
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#include <linux/perf_event.h>
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#include <stdbool.h>
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#include "evsel.h"
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#include "parse-events.h"
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enum {
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PERF_PMU_FORMAT_VALUE_CONFIG,
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PERF_PMU_FORMAT_VALUE_CONFIG1,
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PERF_PMU_FORMAT_VALUE_CONFIG2,
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};
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#define PERF_PMU_FORMAT_BITS 64
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struct perf_event_attr;
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struct perf_pmu {
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char *name;
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__u32 type;
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bool selectable;
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struct perf_event_attr *default_config;
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struct cpu_map *cpus;
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struct list_head format; /* HEAD struct perf_pmu_format -> list */
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struct list_head aliases; /* HEAD struct perf_pmu_alias -> list */
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struct list_head list; /* ELEM */
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int (*set_drv_config) (struct perf_evsel_config_term *term);
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};
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struct perf_pmu_info {
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const char *unit;
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const char *metric_expr;
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double scale;
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bool per_pkg;
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bool snapshot;
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};
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#define UNIT_MAX_LEN 31 /* max length for event unit name */
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struct perf_pmu_alias {
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char *name;
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char *desc;
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char *long_desc;
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char *topic;
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char *str;
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struct list_head terms; /* HEAD struct parse_events_term -> list */
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struct list_head list; /* ELEM */
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char unit[UNIT_MAX_LEN+1];
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double scale;
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bool per_pkg;
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bool snapshot;
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char *metric_expr;
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};
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struct perf_pmu *perf_pmu__find(const char *name);
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int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
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struct list_head *head_terms,
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struct parse_events_error *error);
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int perf_pmu__config_terms(struct list_head *formats,
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struct perf_event_attr *attr,
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struct list_head *head_terms,
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bool zero, struct parse_events_error *error);
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__u64 perf_pmu__format_bits(struct list_head *formats, const char *name);
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int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms,
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struct perf_pmu_info *info);
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struct list_head *perf_pmu__alias(struct perf_pmu *pmu,
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struct list_head *head_terms);
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int perf_pmu_wrap(void);
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void perf_pmu_error(struct list_head *list, char *name, char const *msg);
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int perf_pmu__new_format(struct list_head *list, char *name,
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int config, unsigned long *bits);
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void perf_pmu__set_format(unsigned long *bits, long from, long to);
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int perf_pmu__format_parse(char *dir, struct list_head *head);
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struct perf_pmu *perf_pmu__scan(struct perf_pmu *pmu);
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void print_pmu_events(const char *event_glob, bool name_only, bool quiet,
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bool long_desc);
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bool pmu_have_event(const char *pname, const char *name);
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int perf_pmu__scan_file(struct perf_pmu *pmu, const char *name, const char *fmt,
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...) __attribute__((format(scanf, 3, 4)));
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int perf_pmu__test(void);
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struct perf_event_attr *perf_pmu__get_default_config(struct perf_pmu *pmu);
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#endif /* __PMU_H */
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