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This will allow writing formulas that are conditional on a specific
CPU type or CPU version. It calls through to the existing
strcmp_cpuid_str() function in Perf which has a default weak version,
and an arch specific version for x86 and arm64.
The function takes an 'ID' type value, which is a string. But in this
case Arm CPU IDs are hex numbers prefixed with '0x'. metric.py
assumes strings are only used by event names, and that they can't start
with a number ('0'), so an additional change has to be made to the
regex to convert hex numbers back to 'ID' types.
Signed-off-by: James Clark <james.clark@arm.com>
Reviewed-by: John Garry <john.g.garry@oracle.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Eduard Zingerman <eddyz87@gmail.com>
Cc: Haixin Yu <yuhaixin.yhx@linux.alibaba.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jing Zhang <renyu.zj@linux.alibaba.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Nick Forrington <nick.forrington@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Sohom Datta <sohomdatta1@gmail.com>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20230816114841.1679234-5-james.clark@arm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <internal/cpumap.h>
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#include "../../../util/cpumap.h"
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#include "../../../util/header.h"
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#include "../../../util/pmu.h"
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#include "../../../util/pmus.h"
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#include <api/fs/fs.h>
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#include <math.h>
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const struct pmu_metrics_table *pmu_metrics_table__find(void)
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{
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struct perf_pmu *pmu = pmu__find_core_pmu();
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if (pmu)
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return perf_pmu__find_metrics_table(pmu);
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return NULL;
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}
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const struct pmu_events_table *pmu_events_table__find(void)
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{
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struct perf_pmu *pmu = pmu__find_core_pmu();
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if (pmu)
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return perf_pmu__find_events_table(pmu);
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return NULL;
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}
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double perf_pmu__cpu_slots_per_cycle(void)
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{
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char path[PATH_MAX];
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unsigned long long slots = 0;
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struct perf_pmu *pmu = pmu__find_core_pmu();
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if (pmu) {
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perf_pmu__pathname_scnprintf(path, sizeof(path),
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pmu->name, "caps/slots");
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/*
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* The value of slots is not greater than 32 bits, but
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* filename__read_int can't read value with 0x prefix,
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* so use filename__read_ull instead.
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*/
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filename__read_ull(path, &slots);
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}
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return slots ? (double)slots : NAN;
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}
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