forked from luck/tmp_suning_uos_patched
54cc54decd
Introduce a bkw_mmap_state state machine to evlist:
.________________(forbid)_____________.
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NOTREADY --(0)--> RUNNING --(1)--> DATA_PENDING --(2)--> EMPTY
^ ^ | ^ |
| |__(forbid)____/ |___(forbid)___/|
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\_________________(3)_______________/
NOTREADY : Backward ring buffers are not ready
RUNNING : Backward ring buffers are recording
DATA_PENDING : We are required to collect data from backward ring buffers
EMPTY : We have collected data from backward ring buffers.
(0): Setup backward ring buffer
(1): Pause ring buffers for reading
(2): Read from ring buffers
(3): Resume ring buffers for recording
We can't avoid this complexity. Since we deliberately drop records from
overwritable ring buffer, there's no way for us to check remaining from
ring buffer itself (by checking head and old pointers). Therefore, we
need DATA_PENDING and EMPTY state to help us recording what we have done
to the ring buffer.
In record__mmap_read_evlist(), drive this state machine from DATA_PENDING
to EMPTY.
In perf_evlist__mmap_per_evsel(), drive this state machine from NOTREADY
to RUNNING when creating backward mmap.
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: He Kuang <hekuang@huawei.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Nilay Vaish <nilayvaish@gmail.com>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1468485287-33422-11-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
373 lines
12 KiB
C
373 lines
12 KiB
C
#ifndef __PERF_EVLIST_H
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#define __PERF_EVLIST_H 1
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#include <linux/atomic.h>
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#include <linux/list.h>
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#include <api/fd/array.h>
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#include <stdio.h>
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#include "../perf.h"
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#include "event.h"
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#include "evsel.h"
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#include "util.h"
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#include "auxtrace.h"
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#include <unistd.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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struct record_opts;
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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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/**
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* struct perf_mmap - perf's ring buffer mmap details
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*
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* @refcnt - e.g. code using PERF_EVENT_IOC_SET_OUTPUT to share this
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*/
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struct perf_mmap {
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void *base;
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int mask;
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int fd;
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atomic_t refcnt;
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u64 prev;
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struct auxtrace_mmap auxtrace_mmap;
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char event_copy[PERF_SAMPLE_MAX_SIZE] __attribute__((aligned(8)));
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};
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static inline size_t
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perf_mmap__mmap_len(struct perf_mmap *map)
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{
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return map->mask + 1 + page_size;
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}
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/*
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* State machine of bkw_mmap_state:
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*
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* .________________(forbid)_____________.
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* | V
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* NOTREADY --(0)--> RUNNING --(1)--> DATA_PENDING --(2)--> EMPTY
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* ^ ^ | ^ |
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* | |__(forbid)____/ |___(forbid)___/|
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* | |
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* \_________________(3)_______________/
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*
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* NOTREADY : Backward ring buffers are not ready
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* RUNNING : Backward ring buffers are recording
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* DATA_PENDING : We are required to collect data from backward ring buffers
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* EMPTY : We have collected data from backward ring buffers.
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*
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* (0): Setup backward ring buffer
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* (1): Pause ring buffers for reading
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* (2): Read from ring buffers
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* (3): Resume ring buffers for recording
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*/
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enum bkw_mmap_state {
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BKW_MMAP_NOTREADY,
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BKW_MMAP_RUNNING,
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BKW_MMAP_DATA_PENDING,
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BKW_MMAP_EMPTY,
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};
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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_groups;
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int nr_mmaps;
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bool overwrite;
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bool enabled;
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bool has_user_cpus;
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size_t mmap_len;
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int id_pos;
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int is_pos;
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u64 combined_sample_type;
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enum bkw_mmap_state bkw_mmap_state;
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struct {
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int cork_fd;
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pid_t pid;
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} workload;
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struct fdarray pollfd;
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struct perf_mmap *mmap;
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struct perf_mmap *backward_mmap;
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struct thread_map *threads;
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struct cpu_map *cpus;
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struct perf_evsel *selected;
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struct events_stats stats;
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struct perf_env *env;
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};
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struct perf_evsel_str_handler {
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const char *name;
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void *handler;
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};
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struct perf_evlist *perf_evlist__new(void);
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struct perf_evlist *perf_evlist__new_default(void);
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struct perf_evlist *perf_evlist__new_dummy(void);
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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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void perf_evlist__remove(struct perf_evlist *evlist, struct perf_evsel *evsel);
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int perf_evlist__add_default(struct perf_evlist *evlist);
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int __perf_evlist__add_default_attrs(struct perf_evlist *evlist,
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struct perf_event_attr *attrs, size_t nr_attrs);
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#define perf_evlist__add_default_attrs(evlist, array) \
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__perf_evlist__add_default_attrs(evlist, array, ARRAY_SIZE(array))
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int perf_evlist__add_dummy(struct perf_evlist *evlist);
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int perf_evlist__add_newtp(struct perf_evlist *evlist,
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const char *sys, const char *name, void *handler);
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void __perf_evlist__set_sample_bit(struct perf_evlist *evlist,
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enum perf_event_sample_format bit);
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void __perf_evlist__reset_sample_bit(struct perf_evlist *evlist,
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enum perf_event_sample_format bit);
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#define perf_evlist__set_sample_bit(evlist, bit) \
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__perf_evlist__set_sample_bit(evlist, PERF_SAMPLE_##bit)
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#define perf_evlist__reset_sample_bit(evlist, bit) \
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__perf_evlist__reset_sample_bit(evlist, PERF_SAMPLE_##bit)
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int perf_evlist__set_filter(struct perf_evlist *evlist, const char *filter);
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int perf_evlist__set_filter_pid(struct perf_evlist *evlist, pid_t pid);
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int perf_evlist__set_filter_pids(struct perf_evlist *evlist, size_t npids, pid_t *pids);
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struct perf_evsel *
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perf_evlist__find_tracepoint_by_id(struct perf_evlist *evlist, int id);
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struct perf_evsel *
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perf_evlist__find_tracepoint_by_name(struct perf_evlist *evlist,
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const char *name);
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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__id_add_fd(struct perf_evlist *evlist,
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struct perf_evsel *evsel,
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int cpu, int thread, int fd);
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int perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd);
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int perf_evlist__alloc_pollfd(struct perf_evlist *evlist);
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int perf_evlist__filter_pollfd(struct perf_evlist *evlist, short revents_and_mask);
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int perf_evlist__poll(struct perf_evlist *evlist, int timeout);
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struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id);
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struct perf_evsel *perf_evlist__id2evsel_strict(struct perf_evlist *evlist,
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u64 id);
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struct perf_sample_id *perf_evlist__id2sid(struct perf_evlist *evlist, u64 id);
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void perf_evlist__toggle_bkw_mmap(struct perf_evlist *evlist, enum bkw_mmap_state state);
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union perf_event *perf_mmap__read_forward(struct perf_mmap *map, bool check_messup);
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union perf_event *perf_mmap__read_backward(struct perf_mmap *map);
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void perf_mmap__read_catchup(struct perf_mmap *md);
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void perf_mmap__consume(struct perf_mmap *md, bool overwrite);
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union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx);
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union perf_event *perf_evlist__mmap_read_forward(struct perf_evlist *evlist,
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int idx);
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union perf_event *perf_evlist__mmap_read_backward(struct perf_evlist *evlist,
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int idx);
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void perf_evlist__mmap_read_catchup(struct perf_evlist *evlist, int idx);
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void perf_evlist__mmap_consume(struct perf_evlist *evlist, int idx);
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int perf_evlist__pause(struct perf_evlist *evlist);
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int perf_evlist__resume(struct perf_evlist *evlist);
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int perf_evlist__open(struct perf_evlist *evlist);
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void perf_evlist__close(struct perf_evlist *evlist);
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struct callchain_param;
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void perf_evlist__set_id_pos(struct perf_evlist *evlist);
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bool perf_can_sample_identifier(void);
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bool perf_can_record_switch_events(void);
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bool perf_can_record_cpu_wide(void);
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void perf_evlist__config(struct perf_evlist *evlist, struct record_opts *opts,
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struct callchain_param *callchain);
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int record_opts__config(struct record_opts *opts);
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int perf_evlist__prepare_workload(struct perf_evlist *evlist,
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struct target *target,
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const char *argv[], bool pipe_output,
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void (*exec_error)(int signo, siginfo_t *info,
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void *ucontext));
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int perf_evlist__start_workload(struct perf_evlist *evlist);
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struct option;
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int __perf_evlist__parse_mmap_pages(unsigned int *mmap_pages, const char *str);
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int perf_evlist__parse_mmap_pages(const struct option *opt,
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const char *str,
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int unset);
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unsigned long perf_event_mlock_kb_in_pages(void);
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int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages,
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bool overwrite, unsigned int auxtrace_pages,
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bool auxtrace_overwrite);
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int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
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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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void perf_evlist__toggle_enable(struct perf_evlist *evlist);
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int perf_evlist__enable_event_idx(struct perf_evlist *evlist,
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struct perf_evsel *evsel, int idx);
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void perf_evlist__set_selected(struct perf_evlist *evlist,
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struct perf_evsel *evsel);
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void perf_evlist__set_maps(struct perf_evlist *evlist, struct cpu_map *cpus,
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struct thread_map *threads);
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int perf_evlist__create_maps(struct perf_evlist *evlist, struct target *target);
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int perf_evlist__apply_filters(struct perf_evlist *evlist, struct perf_evsel **err_evsel);
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void __perf_evlist__set_leader(struct list_head *list);
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void perf_evlist__set_leader(struct perf_evlist *evlist);
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u64 perf_evlist__read_format(struct perf_evlist *evlist);
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u64 __perf_evlist__combined_sample_type(struct perf_evlist *evlist);
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u64 perf_evlist__combined_sample_type(struct perf_evlist *evlist);
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u64 perf_evlist__combined_branch_type(struct perf_evlist *evlist);
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bool perf_evlist__sample_id_all(struct perf_evlist *evlist);
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u16 perf_evlist__id_hdr_size(struct perf_evlist *evlist);
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int perf_evlist__parse_sample(struct perf_evlist *evlist, union perf_event *event,
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struct perf_sample *sample);
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bool perf_evlist__valid_sample_type(struct perf_evlist *evlist);
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bool perf_evlist__valid_sample_id_all(struct perf_evlist *evlist);
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bool perf_evlist__valid_read_format(struct perf_evlist *evlist);
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void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
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struct list_head *list);
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static inline struct perf_evsel *perf_evlist__first(struct perf_evlist *evlist)
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{
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return list_entry(evlist->entries.next, struct perf_evsel, node);
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}
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static inline struct perf_evsel *perf_evlist__last(struct perf_evlist *evlist)
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{
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return list_entry(evlist->entries.prev, struct perf_evsel, node);
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}
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size_t perf_evlist__fprintf(struct perf_evlist *evlist, FILE *fp);
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int perf_evlist__strerror_open(struct perf_evlist *evlist, int err, char *buf, size_t size);
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int perf_evlist__strerror_mmap(struct perf_evlist *evlist, int err, char *buf, size_t size);
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static inline u64 perf_mmap__read_head(struct perf_mmap *mm)
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{
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struct perf_event_mmap_page *pc = mm->base;
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u64 head = ACCESS_ONCE(pc->data_head);
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rmb();
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return head;
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}
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static inline void perf_mmap__write_tail(struct perf_mmap *md, u64 tail)
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{
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struct perf_event_mmap_page *pc = md->base;
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/*
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* ensure all reads are done before we write the tail out.
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*/
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mb();
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pc->data_tail = tail;
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}
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bool perf_evlist__can_select_event(struct perf_evlist *evlist, const char *str);
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void perf_evlist__to_front(struct perf_evlist *evlist,
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struct perf_evsel *move_evsel);
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/**
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* __evlist__for_each_entry - iterate thru all the evsels
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* @list: list_head instance to iterate
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* @evsel: struct evsel iterator
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*/
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#define __evlist__for_each_entry(list, evsel) \
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list_for_each_entry(evsel, list, node)
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/**
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* evlist__for_each_entry - iterate thru all the evsels
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* @evlist: evlist instance to iterate
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* @evsel: struct evsel iterator
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*/
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#define evlist__for_each_entry(evlist, evsel) \
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__evlist__for_each_entry(&(evlist)->entries, evsel)
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/**
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* __evlist__for_each_entry_continue - continue iteration thru all the evsels
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* @list: list_head instance to iterate
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* @evsel: struct evsel iterator
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*/
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#define __evlist__for_each_entry_continue(list, evsel) \
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list_for_each_entry_continue(evsel, list, node)
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/**
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* evlist__for_each_entry_continue - continue iteration thru all the evsels
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* @evlist: evlist instance to iterate
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* @evsel: struct evsel iterator
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*/
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#define evlist__for_each_entry_continue(evlist, evsel) \
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__evlist__for_each_entry_continue(&(evlist)->entries, evsel)
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/**
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* __evlist__for_each_entry_reverse - iterate thru all the evsels in reverse order
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* @list: list_head instance to iterate
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* @evsel: struct evsel iterator
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*/
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#define __evlist__for_each_entry_reverse(list, evsel) \
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list_for_each_entry_reverse(evsel, list, node)
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/**
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* evlist__for_each_entry_reverse - iterate thru all the evsels in reverse order
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* @evlist: evlist instance to iterate
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* @evsel: struct evsel iterator
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*/
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#define evlist__for_each_entry_reverse(evlist, evsel) \
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__evlist__for_each_entry_reverse(&(evlist)->entries, evsel)
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/**
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* __evlist__for_each_entry_safe - safely iterate thru all the evsels
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* @list: list_head instance to iterate
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* @tmp: struct evsel temp iterator
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* @evsel: struct evsel iterator
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*/
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#define __evlist__for_each_entry_safe(list, tmp, evsel) \
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list_for_each_entry_safe(evsel, tmp, list, node)
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/**
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* evlist__for_each_entry_safe - safely iterate thru all the evsels
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* @evlist: evlist instance to iterate
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* @evsel: struct evsel iterator
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* @tmp: struct evsel temp iterator
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*/
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#define evlist__for_each_entry_safe(evlist, tmp, evsel) \
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__evlist__for_each_entry_safe(&(evlist)->entries, tmp, evsel)
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void perf_evlist__set_tracking_event(struct perf_evlist *evlist,
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struct perf_evsel *tracking_evsel);
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void perf_event_attr__set_max_precise_ip(struct perf_event_attr *attr);
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struct perf_evsel *
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perf_evlist__find_evsel_by_str(struct perf_evlist *evlist, const char *str);
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struct perf_evsel *perf_evlist__event2evsel(struct perf_evlist *evlist,
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union perf_event *event);
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#endif /* __PERF_EVLIST_H */
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