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The default config is computed during creation of the PMU and may do things like scanning sysfs, when the PMU may just be used as part of scanning. Change default_config to perf_event_attr_init_default, a callback that is used when a default config needs initializing. This avoids holding onto the memory for a perf_event_attr and copying. On a tigerlake laptop running the pmu-scan benchmark: Before: Running 'internals/pmu-scan' benchmark: Computing performance of sysfs PMU event scan for 100 times Average core PMU scanning took: 28.780 usec (+- 0.503 usec) Average PMU scanning took: 283.480 usec (+- 18.471 usec) Number of openat syscalls: 30,227 After: Running 'internals/pmu-scan' benchmark: Computing performance of sysfs PMU event scan for 100 times Average core PMU scanning took: 27.880 usec (+- 0.169 usec) Average PMU scanning took: 245.260 usec (+- 15.758 usec) Number of openat syscalls: 28,914 Over 3 runs it is a nearly 12% reduction in execution time and a 4.3% of openat calls. Signed-off-by: Ian Rogers <irogers@google.com> Reviewed-by: Adrian Hunter <adrian.hunter@intel.com> Cc: Ravi Bangoria <ravi.bangoria@amd.com> Cc: James Clark <james.clark@arm.com> Cc: Suzuki K Poulose <suzuki.poulose@arm.com> Cc: Yang Jihong <yangjihong1@huawei.com> Cc: Will Deacon <will@kernel.org> Cc: Leo Yan <leo.yan@linaro.org> Cc: Mike Leach <mike.leach@linaro.org> Cc: Jing Zhang <renyu.zj@linux.alibaba.com> Cc: Kajol Jain <kjain@linux.ibm.com> Cc: Thomas Richter <tmricht@linux.ibm.com> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: John Garry <john.g.garry@oracle.com> Cc: linux-arm-kernel@lists.infradead.org Cc: coresight@lists.linaro.org Link: https://lore.kernel.org/r/20231012175645.1849503-8-irogers@google.com Signed-off-by: Namhyung Kim <namhyung@kernel.org>
48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* intel_pt.h: Intel Processor Trace support
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* Copyright (c) 2013-2015, Intel Corporation.
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*/
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#ifndef INCLUDE__PERF_INTEL_PT_H__
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#define INCLUDE__PERF_INTEL_PT_H__
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#define INTEL_PT_PMU_NAME "intel_pt"
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enum {
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INTEL_PT_PMU_TYPE,
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INTEL_PT_TIME_SHIFT,
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INTEL_PT_TIME_MULT,
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INTEL_PT_TIME_ZERO,
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INTEL_PT_CAP_USER_TIME_ZERO,
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INTEL_PT_TSC_BIT,
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INTEL_PT_NORETCOMP_BIT,
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INTEL_PT_HAVE_SCHED_SWITCH,
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INTEL_PT_SNAPSHOT_MODE,
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INTEL_PT_PER_CPU_MMAPS,
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INTEL_PT_MTC_BIT,
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INTEL_PT_MTC_FREQ_BITS,
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INTEL_PT_TSC_CTC_N,
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INTEL_PT_TSC_CTC_D,
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INTEL_PT_CYC_BIT,
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INTEL_PT_MAX_NONTURBO_RATIO,
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INTEL_PT_FILTER_STR_LEN,
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INTEL_PT_AUXTRACE_PRIV_MAX,
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};
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struct auxtrace_record;
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struct perf_tool;
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union perf_event;
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struct perf_session;
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struct perf_event_attr;
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struct perf_pmu;
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struct auxtrace_record *intel_pt_recording_init(int *err);
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int intel_pt_process_auxtrace_info(union perf_event *event,
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struct perf_session *session);
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void intel_pt_pmu_default_config(const struct perf_pmu *intel_pt_pmu,
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struct perf_event_attr *attr);
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#endif
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