ef91871c96
The CPU map for a non-core PMU gives a default CPU value for perf_event_open. For core PMUs the CPU map lists all CPUs the evsel may be opened on. If there are >1 core PMU, the CPU maps will list the CPUs for that core PMU, but the user_requested_cpus may contain CPUs that are invalid for the PMU and cause perf_event_open to fail. To avoid this, when propagating the CPU map for core PMUs intersect it with the CPU map of the PMU (the evsel's "own_cpus"). Add comments to __perf_evlist__propagate_maps to explain its somewhat complex behavior. Fix the related comments for system_wide in struct perf_evsel. Reviewed-by: Kan Liang <kan.liang@linux.intel.com> Signed-off-by: Ian Rogers <irogers@google.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Ali Saidi <alisaidi@amazon.com> Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com> Cc: Dmitrii Dolgov <9erthalion6@gmail.com> Cc: Huacai Chen <chenhuacai@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Clark <james.clark@arm.com> Cc: Jing Zhang <renyu.zj@linux.alibaba.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: John Garry <john.g.garry@oracle.com> Cc: Kajol Jain <kjain@linux.ibm.com> Cc: Kang Minchul <tegongkang@gmail.com> Cc: Leo Yan <leo.yan@linaro.org> Cc: Madhavan Srinivasan <maddy@linux.ibm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Mike Leach <mike.leach@linaro.org> Cc: Ming Wang <wangming01@loongson.cn> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ravi Bangoria <ravi.bangoria@amd.com> Cc: Rob Herring <robh@kernel.org> Cc: Sandipan Das <sandipan.das@amd.com> Cc: Sean Christopherson <seanjc@google.com> Cc: Suzuki Poulouse <suzuki.poulose@arm.com> Cc: Thomas Richter <tmricht@linux.ibm.com> Cc: Will Deacon <will@kernel.org> Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com> Cc: coresight@lists.linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: https://lore.kernel.org/r/20230527072210.2900565-9-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
91 lines
2.8 KiB
C
91 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LIBPERF_INTERNAL_EVSEL_H
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#define __LIBPERF_INTERNAL_EVSEL_H
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#include <linux/types.h>
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#include <linux/perf_event.h>
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#include <stdbool.h>
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#include <sys/types.h>
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#include <internal/cpumap.h>
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struct perf_thread_map;
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struct xyarray;
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/*
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* Per fd, to map back from PERF_SAMPLE_ID to evsel, only used when there are
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* more than one entry in the evlist.
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*/
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struct perf_sample_id {
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struct hlist_node node;
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u64 id;
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struct perf_evsel *evsel;
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/*
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* 'idx' will be used for AUX area sampling. A sample will have AUX area
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* data that will be queued for decoding, where there are separate
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* queues for each CPU (per-cpu tracing) or task (per-thread tracing).
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* The sample ID can be used to lookup 'idx' which is effectively the
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* queue number.
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*/
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int idx;
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struct perf_cpu cpu;
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pid_t tid;
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/* Guest machine pid and VCPU, valid only if machine_pid is non-zero */
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pid_t machine_pid;
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struct perf_cpu vcpu;
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/* Holds total ID period value for PERF_SAMPLE_READ processing. */
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u64 period;
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};
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struct perf_evsel {
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struct list_head node;
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struct perf_event_attr attr;
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/** The commonly used cpu map of CPUs the event should be opened upon, etc. */
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struct perf_cpu_map *cpus;
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/**
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* The cpu map read from the PMU. For core PMUs this is the list of all
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* CPUs the event can be opened upon. For other PMUs this is the default
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* cpu map for opening the event on, for example, the first CPU on a
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* socket for an uncore event.
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*/
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struct perf_cpu_map *own_cpus;
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struct perf_thread_map *threads;
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struct xyarray *fd;
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struct xyarray *mmap;
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struct xyarray *sample_id;
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u64 *id;
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u32 ids;
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struct perf_evsel *leader;
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/* parse modifier helper */
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int nr_members;
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/*
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* system_wide is for events that need to be on every CPU, irrespective
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* of user requested CPUs or threads. Tha main example of this is the
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* dummy event. Map propagation will set cpus for this event to all CPUs
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* as software PMU events like dummy, have a CPU map that is empty.
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*/
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bool system_wide;
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/*
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* Some events, for example uncore events, require a CPU.
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* i.e. it cannot be the 'any CPU' value of -1.
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*/
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bool requires_cpu;
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/** Is the PMU for the event a core one? Effects the handling of own_cpus. */
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bool is_pmu_core;
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int idx;
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};
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void perf_evsel__init(struct perf_evsel *evsel, struct perf_event_attr *attr,
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int idx);
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int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads);
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void perf_evsel__close_fd(struct perf_evsel *evsel);
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void perf_evsel__free_fd(struct perf_evsel *evsel);
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int perf_evsel__read_size(struct perf_evsel *evsel);
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int perf_evsel__apply_filter(struct perf_evsel *evsel, const char *filter);
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int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads);
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void perf_evsel__free_id(struct perf_evsel *evsel);
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#endif /* __LIBPERF_INTERNAL_EVSEL_H */
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