764e16a30a
perf-record currently creates events enabled. When doing a system wide collection (-a arg) this causes data collection for perf's initialization activities -- eg., perf_event__synthesize_threads(). For some events (e.g., context switch S/W event or tracepoints like syscalls) perf's initialization causes a lot of events to be captured frequently generating "Check IO/CPU overload!" warnings on larger systems (e.g., 2 socket, quad core, hyperthreading). perf's initialization phase can be skipped by creating events disabled and then enabling them once the initialization is done. Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1314289075-14706-1-git-send-email-dsahern@gmail.com Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
#ifndef __PERF_EVLIST_H
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#define __PERF_EVLIST_H 1
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#include <linux/list.h>
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#include "../perf.h"
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#include "event.h"
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struct pollfd;
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struct thread_map;
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struct cpu_map;
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#define PERF_EVLIST__HLIST_BITS 8
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#define PERF_EVLIST__HLIST_SIZE (1 << PERF_EVLIST__HLIST_BITS)
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struct perf_evlist {
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struct list_head entries;
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struct hlist_head heads[PERF_EVLIST__HLIST_SIZE];
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int nr_entries;
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int nr_fds;
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int nr_mmaps;
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int mmap_len;
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bool overwrite;
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union perf_event event_copy;
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struct perf_mmap *mmap;
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struct pollfd *pollfd;
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struct thread_map *threads;
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struct cpu_map *cpus;
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};
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struct perf_evsel;
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struct perf_evlist *perf_evlist__new(struct cpu_map *cpus,
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struct thread_map *threads);
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void perf_evlist__init(struct perf_evlist *evlist, struct cpu_map *cpus,
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struct thread_map *threads);
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void perf_evlist__exit(struct perf_evlist *evlist);
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void perf_evlist__delete(struct perf_evlist *evlist);
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void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry);
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int perf_evlist__add_default(struct perf_evlist *evlist);
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void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel,
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int cpu, int thread, u64 id);
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int perf_evlist__alloc_pollfd(struct perf_evlist *evlist);
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void perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd);
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struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id);
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union perf_event *perf_evlist__mmap_read(struct perf_evlist *self, int idx);
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int perf_evlist__alloc_mmap(struct perf_evlist *evlist);
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int perf_evlist__mmap(struct perf_evlist *evlist, int pages, bool overwrite);
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void perf_evlist__munmap(struct perf_evlist *evlist);
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void perf_evlist__disable(struct perf_evlist *evlist);
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void perf_evlist__enable(struct perf_evlist *evlist);
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static inline void perf_evlist__set_maps(struct perf_evlist *evlist,
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struct cpu_map *cpus,
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struct thread_map *threads)
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{
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evlist->cpus = cpus;
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evlist->threads = threads;
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}
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int perf_evlist__create_maps(struct perf_evlist *evlist, pid_t target_pid,
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pid_t target_tid, const char *cpu_list);
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void perf_evlist__delete_maps(struct perf_evlist *evlist);
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int perf_evlist__set_filters(struct perf_evlist *evlist);
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u64 perf_evlist__sample_type(const struct perf_evlist *evlist);
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bool perf_evlist__sample_id_all(const const struct perf_evlist *evlist);
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bool perf_evlist__valid_sample_type(const struct perf_evlist *evlist);
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bool perf_evlist__valid_sample_id_all(const struct perf_evlist *evlist);
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#endif /* __PERF_EVLIST_H */
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