linux/tools/perf/util/evlist.h
Jiri Olsa f186cd6148 perf tools: Add 'stop' control command
Adding control 'stop' command to stop perf record.

When it is received, perf will set the 'done' variable to 1 to stop its
mmap ring buffer reading loop.

Example session:

  terminal 1:
    # mkfifo control ack
    # perf record --control=fifo:control,ack

  terminal 2:
    # echo stop > control

  terminal 1:
    [ perf record: Woken up 7 times to write data ]
    [ perf record: Captured and wrote 3.214 MB perf.data (38280 samples) ]
    #

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexei Budankov <abudankov@huawei.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20201226232038.390883-4-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2021-01-20 14:34:21 -03:00

361 lines
12 KiB
C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __PERF_EVLIST_H
#define __PERF_EVLIST_H 1
#include <linux/compiler.h>
#include <linux/kernel.h>
#include <linux/refcount.h>
#include <linux/list.h>
#include <api/fd/array.h>
#include <internal/evlist.h>
#include <internal/evsel.h>
#include "events_stats.h"
#include "evsel.h"
#include <pthread.h>
#include <signal.h>
#include <unistd.h>
struct pollfd;
struct thread_map;
struct perf_cpu_map;
struct record_opts;
/*
* State machine of bkw_mmap_state:
*
* .________________(forbid)_____________.
* | V
* NOTREADY --(0)--> RUNNING --(1)--> DATA_PENDING --(2)--> EMPTY
* ^ ^ | ^ |
* | |__(forbid)____/ |___(forbid)___/|
* | |
* \_________________(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
*/
enum bkw_mmap_state {
BKW_MMAP_NOTREADY,
BKW_MMAP_RUNNING,
BKW_MMAP_DATA_PENDING,
BKW_MMAP_EMPTY,
};
struct evlist {
struct perf_evlist core;
int nr_groups;
bool enabled;
int id_pos;
int is_pos;
u64 combined_sample_type;
enum bkw_mmap_state bkw_mmap_state;
struct {
int cork_fd;
pid_t pid;
} workload;
struct mmap *mmap;
struct mmap *overwrite_mmap;
struct evsel *selected;
struct events_stats stats;
struct perf_env *env;
void (*trace_event_sample_raw)(struct evlist *evlist,
union perf_event *event,
struct perf_sample *sample);
u64 first_sample_time;
u64 last_sample_time;
struct {
pthread_t th;
volatile int done;
} thread;
struct {
int fd; /* control file descriptor */
int ack; /* ack file descriptor for control commands */
int pos; /* index at evlist core object to check signals */
} ctl_fd;
};
struct evsel_str_handler {
const char *name;
void *handler;
};
struct evlist *evlist__new(void);
struct evlist *evlist__new_default(void);
struct evlist *evlist__new_dummy(void);
void evlist__init(struct evlist *evlist, struct perf_cpu_map *cpus,
struct perf_thread_map *threads);
void evlist__exit(struct evlist *evlist);
void evlist__delete(struct evlist *evlist);
void evlist__add(struct evlist *evlist, struct evsel *entry);
void evlist__remove(struct evlist *evlist, struct evsel *evsel);
int __evlist__add_default(struct evlist *evlist, bool precise);
static inline int evlist__add_default(struct evlist *evlist)
{
return __evlist__add_default(evlist, true);
}
int __evlist__add_default_attrs(struct evlist *evlist,
struct perf_event_attr *attrs, size_t nr_attrs);
#define evlist__add_default_attrs(evlist, array) \
__evlist__add_default_attrs(evlist, array, ARRAY_SIZE(array))
int evlist__add_dummy(struct evlist *evlist);
int evlist__add_sb_event(struct evlist *evlist, struct perf_event_attr *attr,
evsel__sb_cb_t cb, void *data);
void evlist__set_cb(struct evlist *evlist, evsel__sb_cb_t cb, void *data);
int evlist__start_sb_thread(struct evlist *evlist, struct target *target);
void evlist__stop_sb_thread(struct evlist *evlist);
int evlist__add_newtp(struct evlist *evlist, const char *sys, const char *name, void *handler);
int __evlist__set_tracepoints_handlers(struct evlist *evlist,
const struct evsel_str_handler *assocs,
size_t nr_assocs);
#define evlist__set_tracepoints_handlers(evlist, array) \
__evlist__set_tracepoints_handlers(evlist, array, ARRAY_SIZE(array))
int evlist__set_tp_filter(struct evlist *evlist, const char *filter);
int evlist__set_tp_filter_pid(struct evlist *evlist, pid_t pid);
int evlist__set_tp_filter_pids(struct evlist *evlist, size_t npids, pid_t *pids);
int evlist__append_tp_filter(struct evlist *evlist, const char *filter);
int evlist__append_tp_filter_pid(struct evlist *evlist, pid_t pid);
int evlist__append_tp_filter_pids(struct evlist *evlist, size_t npids, pid_t *pids);
struct evsel *evlist__find_tracepoint_by_id(struct evlist *evlist, int id);
struct evsel *evlist__find_tracepoint_by_name(struct evlist *evlist, const char *name);
int evlist__add_pollfd(struct evlist *evlist, int fd);
int evlist__filter_pollfd(struct evlist *evlist, short revents_and_mask);
int evlist__poll(struct evlist *evlist, int timeout);
struct evsel *evlist__id2evsel(struct evlist *evlist, u64 id);
struct evsel *evlist__id2evsel_strict(struct evlist *evlist, u64 id);
struct perf_sample_id *evlist__id2sid(struct evlist *evlist, u64 id);
void evlist__toggle_bkw_mmap(struct evlist *evlist, enum bkw_mmap_state state);
void evlist__mmap_consume(struct evlist *evlist, int idx);
int evlist__open(struct evlist *evlist);
void evlist__close(struct evlist *evlist);
struct callchain_param;
void evlist__set_id_pos(struct evlist *evlist);
void evlist__config(struct evlist *evlist, struct record_opts *opts, struct callchain_param *callchain);
int record_opts__config(struct record_opts *opts);
int evlist__prepare_workload(struct evlist *evlist, struct target *target,
const char *argv[], bool pipe_output,
void (*exec_error)(int signo, siginfo_t *info, void *ucontext));
int evlist__start_workload(struct evlist *evlist);
struct option;
int __evlist__parse_mmap_pages(unsigned int *mmap_pages, const char *str);
int evlist__parse_mmap_pages(const struct option *opt, const char *str, int unset);
unsigned long perf_event_mlock_kb_in_pages(void);
int evlist__mmap_ex(struct evlist *evlist, unsigned int pages,
unsigned int auxtrace_pages,
bool auxtrace_overwrite, int nr_cblocks,
int affinity, int flush, int comp_level);
int evlist__mmap(struct evlist *evlist, unsigned int pages);
void evlist__munmap(struct evlist *evlist);
size_t evlist__mmap_size(unsigned long pages);
void evlist__disable(struct evlist *evlist);
void evlist__enable(struct evlist *evlist);
void evlist__toggle_enable(struct evlist *evlist);
void evlist__disable_evsel(struct evlist *evlist, char *evsel_name);
void evlist__enable_evsel(struct evlist *evlist, char *evsel_name);
int evlist__enable_event_idx(struct evlist *evlist, struct evsel *evsel, int idx);
void evlist__set_selected(struct evlist *evlist, struct evsel *evsel);
int evlist__create_maps(struct evlist *evlist, struct target *target);
int evlist__apply_filters(struct evlist *evlist, struct evsel **err_evsel);
void __evlist__set_leader(struct list_head *list);
void evlist__set_leader(struct evlist *evlist);
u64 __evlist__combined_sample_type(struct evlist *evlist);
u64 evlist__combined_sample_type(struct evlist *evlist);
u64 evlist__combined_branch_type(struct evlist *evlist);
bool evlist__sample_id_all(struct evlist *evlist);
u16 evlist__id_hdr_size(struct evlist *evlist);
int evlist__parse_sample(struct evlist *evlist, union perf_event *event, struct perf_sample *sample);
int evlist__parse_sample_timestamp(struct evlist *evlist, union perf_event *event, u64 *timestamp);
bool evlist__valid_sample_type(struct evlist *evlist);
bool evlist__valid_sample_id_all(struct evlist *evlist);
bool evlist__valid_read_format(struct evlist *evlist);
void evlist__splice_list_tail(struct evlist *evlist, struct list_head *list);
static inline bool evlist__empty(struct evlist *evlist)
{
return list_empty(&evlist->core.entries);
}
static inline struct evsel *evlist__first(struct evlist *evlist)
{
struct perf_evsel *evsel = perf_evlist__first(&evlist->core);
return container_of(evsel, struct evsel, core);
}
static inline struct evsel *evlist__last(struct evlist *evlist)
{
struct perf_evsel *evsel = perf_evlist__last(&evlist->core);
return container_of(evsel, struct evsel, core);
}
int evlist__strerror_open(struct evlist *evlist, int err, char *buf, size_t size);
int evlist__strerror_mmap(struct evlist *evlist, int err, char *buf, size_t size);
bool evlist__can_select_event(struct evlist *evlist, const char *str);
void evlist__to_front(struct evlist *evlist, struct evsel *move_evsel);
/**
* __evlist__for_each_entry - iterate thru all the evsels
* @list: list_head instance to iterate
* @evsel: struct evsel iterator
*/
#define __evlist__for_each_entry(list, evsel) \
list_for_each_entry(evsel, list, core.node)
/**
* evlist__for_each_entry - iterate thru all the evsels
* @evlist: evlist instance to iterate
* @evsel: struct evsel iterator
*/
#define evlist__for_each_entry(evlist, evsel) \
__evlist__for_each_entry(&(evlist)->core.entries, evsel)
/**
* __evlist__for_each_entry_continue - continue iteration thru all the evsels
* @list: list_head instance to iterate
* @evsel: struct evsel iterator
*/
#define __evlist__for_each_entry_continue(list, evsel) \
list_for_each_entry_continue(evsel, list, core.node)
/**
* evlist__for_each_entry_continue - continue iteration thru all the evsels
* @evlist: evlist instance to iterate
* @evsel: struct evsel iterator
*/
#define evlist__for_each_entry_continue(evlist, evsel) \
__evlist__for_each_entry_continue(&(evlist)->core.entries, evsel)
/**
* __evlist__for_each_entry_reverse - iterate thru all the evsels in reverse order
* @list: list_head instance to iterate
* @evsel: struct evsel iterator
*/
#define __evlist__for_each_entry_reverse(list, evsel) \
list_for_each_entry_reverse(evsel, list, core.node)
/**
* evlist__for_each_entry_reverse - iterate thru all the evsels in reverse order
* @evlist: evlist instance to iterate
* @evsel: struct evsel iterator
*/
#define evlist__for_each_entry_reverse(evlist, evsel) \
__evlist__for_each_entry_reverse(&(evlist)->core.entries, evsel)
/**
* __evlist__for_each_entry_safe - safely iterate thru all the evsels
* @list: list_head instance to iterate
* @tmp: struct evsel temp iterator
* @evsel: struct evsel iterator
*/
#define __evlist__for_each_entry_safe(list, tmp, evsel) \
list_for_each_entry_safe(evsel, tmp, list, core.node)
/**
* evlist__for_each_entry_safe - safely iterate thru all the evsels
* @evlist: evlist instance to iterate
* @evsel: struct evsel iterator
* @tmp: struct evsel temp iterator
*/
#define evlist__for_each_entry_safe(evlist, tmp, evsel) \
__evlist__for_each_entry_safe(&(evlist)->core.entries, tmp, evsel)
#define evlist__for_each_cpu(evlist, index, cpu) \
evlist__cpu_iter_start(evlist); \
perf_cpu_map__for_each_cpu (cpu, index, (evlist)->core.all_cpus)
struct evsel *evlist__get_tracking_event(struct evlist *evlist);
void evlist__set_tracking_event(struct evlist *evlist, struct evsel *tracking_evsel);
void evlist__cpu_iter_start(struct evlist *evlist);
bool evsel__cpu_iter_skip(struct evsel *ev, int cpu);
bool evsel__cpu_iter_skip_no_inc(struct evsel *ev, int cpu);
struct evsel *evlist__find_evsel_by_str(struct evlist *evlist, const char *str);
struct evsel *evlist__event2evsel(struct evlist *evlist, union perf_event *event);
bool evlist__exclude_kernel(struct evlist *evlist);
void evlist__force_leader(struct evlist *evlist);
struct evsel *evlist__reset_weak_group(struct evlist *evlist, struct evsel *evsel, bool close);
#define EVLIST_CTL_CMD_ENABLE_TAG "enable"
#define EVLIST_CTL_CMD_DISABLE_TAG "disable"
#define EVLIST_CTL_CMD_ACK_TAG "ack\n"
#define EVLIST_CTL_CMD_SNAPSHOT_TAG "snapshot"
#define EVLIST_CTL_CMD_EVLIST_TAG "evlist"
#define EVLIST_CTL_CMD_STOP_TAG "stop"
#define EVLIST_CTL_CMD_MAX_LEN 64
enum evlist_ctl_cmd {
EVLIST_CTL_CMD_UNSUPPORTED = 0,
EVLIST_CTL_CMD_ENABLE,
EVLIST_CTL_CMD_DISABLE,
EVLIST_CTL_CMD_ACK,
EVLIST_CTL_CMD_SNAPSHOT,
EVLIST_CTL_CMD_EVLIST,
EVLIST_CTL_CMD_STOP,
};
int evlist__parse_control(const char *str, int *ctl_fd, int *ctl_fd_ack, bool *ctl_fd_close);
void evlist__close_control(int ctl_fd, int ctl_fd_ack, bool *ctl_fd_close);
int evlist__initialize_ctlfd(struct evlist *evlist, int ctl_fd, int ctl_fd_ack);
int evlist__finalize_ctlfd(struct evlist *evlist);
bool evlist__ctlfd_initialized(struct evlist *evlist);
int evlist__ctlfd_process(struct evlist *evlist, enum evlist_ctl_cmd *cmd);
int evlist__ctlfd_ack(struct evlist *evlist);
#define EVLIST_ENABLED_MSG "Events enabled\n"
#define EVLIST_DISABLED_MSG "Events disabled\n"
struct evsel *evlist__find_evsel(struct evlist *evlist, int idx);
#endif /* __PERF_EVLIST_H */