tools/perf/util/session.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __PERF_SESSION_H
   3 #define __PERF_SESSION_H
   4
   5 #include "trace-event.h"
   6 #include "event.h"
   7 #include "header.h"
   8 #include "machine.h"
   9 #include "data.h"
  10 #include "ordered-events.h"
  11 #include "util/compress.h"
  12 #include <linux/kernel.h>
  13 #include <linux/rbtree.h>
  14 #include <linux/perf_event.h>
  15
  16 struct ip_callchain;
  17 struct symbol;
  18 struct thread;
  19
  20 struct auxtrace;
  21 struct itrace_synth_opts;
  22
  23 struct decomp_data {
  24         struct decomp    *decomp;
  25         struct decomp    *decomp_last;
  26         struct zstd_data *zstd_decomp;
  27 };
  28
  29 /**
  30  * struct perf_session- A Perf session holds the main state when the program is
  31  * working with live perf events or reading data from an input file.
  32  *
  33  * The rough organization of a perf_session is:
  34  * ```
  35  * +--------------+           +-----------+           +------------+
  36  * |   Session    |1..* ----->|  Machine  |1..* ----->|   Thread   |
  37  * +--------------+           +-----------+           +------------+
  38  * ```
  39  */
  40 struct perf_session {
  41         /**
  42          * @header: The read version of a perf_file_header, or captures global
  43          * information from a live session.
  44          */
  45         struct perf_header      header;
  46         /** @machines: Machines within the session a host and 0 or more guests. */
  47         struct machines         machines;
  48         /** @evlist: List of evsels/events of the session. */
  49         struct evlist   *evlist;
  50         /** @auxtrace: callbacks to allow AUX area data decoding. */
  51         const struct auxtrace   *auxtrace;
  52         /** @itrace_synth_opts: AUX area tracing synthesis options. */
  53         struct itrace_synth_opts *itrace_synth_opts;
  54         /** @auxtrace_index: index of AUX area tracing events within a perf.data file. */
  55         struct list_head        auxtrace_index;
  56 #ifdef HAVE_LIBTRACEEVENT
  57         /** @tevent: handles for libtraceevent and plugins. */
  58         struct trace_event      tevent;
  59 #endif
  60         /** @time_conv: Holds contents of last PERF_RECORD_TIME_CONV event. */
  61         struct perf_record_time_conv    time_conv;
  62         /** @trace_event_repipe: When set causes read trace events to be written to stdout. */
  63         bool                    trace_event_repipe;
  64         /**
  65          * @one_mmap: The reader will use a single mmap by default. There may be
  66          * multiple data files in particular for aux events. If this is true
  67          * then the single big mmap for the data file can be assumed.
  68          */
  69         bool                    one_mmap;
  70         /** @one_mmap_addr: Address of initial perf data file reader mmap. */
  71         void                    *one_mmap_addr;
  72         /** @one_mmap_offset: File offset in perf.data file when mapped. */
  73         u64                     one_mmap_offset;
  74         /** @ordered_events: Used to turn unordered events into ordered ones. */
  75         struct ordered_events   ordered_events;
  76         /** @data: Optional perf data file being read from. */
  77         struct perf_data        *data;
  78         /** @tool: callbacks for event handling. */
  79         const struct perf_tool  *tool;
  80         /**
  81          * @bytes_transferred: Used by perf record to count written bytes before
  82          * compression.
  83          */
  84         u64                     bytes_transferred;
  85         /**
  86          * @bytes_compressed: Used by perf record to count written bytes after
  87          * compression.
  88          */
  89         u64                     bytes_compressed;
  90         /** @zstd_data: Owner of global compression state, buffers, etc. */
  91         struct zstd_data        zstd_data;
  92         struct decomp_data      decomp_data;
  93         struct decomp_data      *active_decomp;
  94 };
  95
  96 struct decomp {
  97         struct decomp *next;
  98         u64 file_pos;
  99         const char *file_path;
 100         size_t mmap_len;
 101         u64 head;
 102         size_t size;
 103         char data[];
 104 };
 105
 106 struct perf_tool;
 107
 108 struct perf_session *__perf_session__new(struct perf_data *data,
 109                                          struct perf_tool *tool,
 110                                          bool trace_event_repipe);
 111
 112 static inline struct perf_session *perf_session__new(struct perf_data *data,
 113                                                      struct perf_tool *tool)
 114 {
 115         return __perf_session__new(data, tool, /*trace_event_repipe=*/false);
 116 }
 117
 118 void perf_session__delete(struct perf_session *session);
 119
 120 void perf_event_header__bswap(struct perf_event_header *hdr);
 121
 122 int perf_session__peek_event(struct perf_session *session, off_t file_offset,
 123                              void *buf, size_t buf_sz,
 124                              union perf_event **event_ptr,
 125                              struct perf_sample *sample);
 126 typedef int (*peek_events_cb_t)(struct perf_session *session,
 127                                 union perf_event *event, u64 offset,
 128                                 void *data);
 129 int perf_session__peek_events(struct perf_session *session, u64 offset,
 130                               u64 size, peek_events_cb_t cb, void *data);
 131
 132 int perf_session__process_events(struct perf_session *session);
 133
 134 int perf_session__queue_event(struct perf_session *s, union perf_event *event,
 135                               u64 timestamp, u64 file_offset, const char *file_path);
 136
 137 int perf_session__resolve_callchain(struct perf_session *session,
 138                                     struct evsel *evsel,
 139                                     struct thread *thread,
 140                                     struct ip_callchain *chain,
 141                                     struct symbol **parent);
 142
 143 bool perf_session__has_traces(struct perf_session *session, const char *msg);
 144
 145 void perf_event__attr_swap(struct perf_event_attr *attr);
 146
 147 int perf_session__create_kernel_maps(struct perf_session *session);
 148
 149 void perf_session__set_id_hdr_size(struct perf_session *session);
 150
 151 static inline
 152 struct machine *perf_session__find_machine(struct perf_session *session, pid_t pid)
 153 {
 154         return machines__find(&session->machines, pid);
 155 }
 156
 157 static inline
 158 struct machine *perf_session__findnew_machine(struct perf_session *session, pid_t pid)
 159 {
 160         return machines__findnew(&session->machines, pid);
 161 }
 162
 163 struct thread *perf_session__findnew(struct perf_session *session, pid_t pid);
 164 int perf_session__register_idle_thread(struct perf_session *session);
 165
 166 size_t perf_session__fprintf(struct perf_session *session, FILE *fp);
 167
 168 size_t perf_session__fprintf_dsos(struct perf_session *session, FILE *fp);
 169
 170 size_t perf_session__fprintf_dsos_buildid(struct perf_session *session, FILE *fp,
 171                                           bool (fn)(struct dso *dso, int parm), int parm);
 172
 173 size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp);
 174
 175 void perf_session__dump_kmaps(struct perf_session *session);
 176
 177 struct evsel *perf_session__find_first_evtype(struct perf_session *session,
 178                                             unsigned int type);
 179
 180 int perf_session__cpu_bitmap(struct perf_session *session,
 181                              const char *cpu_list, unsigned long *cpu_bitmap);
 182
 183 void perf_session__fprintf_info(struct perf_session *s, FILE *fp, bool full);
 184
 185 struct evsel_str_handler;
 186
 187 #define perf_session__set_tracepoints_handlers(session, array) \
 188         __evlist__set_tracepoints_handlers(session->evlist, array, ARRAY_SIZE(array))
 189
 190 extern volatile int session_done;
 191
 192 #define session_done()  READ_ONCE(session_done)
 193
 194 int perf_session__deliver_synth_event(struct perf_session *session,
 195                                       union perf_event *event,
 196                                       struct perf_sample *sample);
 197 int perf_session__deliver_synth_attr_event(struct perf_session *session,
 198                                            const struct perf_event_attr *attr,
 199                                            u64 id);
 200
 201 int perf_session__dsos_hit_all(struct perf_session *session);
 202
 203 int perf_event__process_id_index(struct perf_session *session,
 204                                  union perf_event *event);
 205
 206 int perf_event__process_finished_round(const struct perf_tool *tool,
 207                                        union perf_event *event,
 208                                        struct ordered_events *oe);
 209
 210 #endif /* __PERF_SESSION_H */