diff options
Diffstat (limited to 'tools/perf/util/auxtrace.h')
| -rw-r--r-- | tools/perf/util/auxtrace.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/tools/perf/util/auxtrace.h b/tools/perf/util/auxtrace.h index 8c6cbb123fe5..c2c677e62733 100644 --- a/tools/perf/util/auxtrace.h +++ b/tools/perf/util/auxtrace.h @@ -276,6 +276,10 @@ struct auxtrace_mmap_params { * @info_priv_size: return the size of the private data in auxtrace_info_event * @info_fill: fill-in the private data in auxtrace_info_event * @free: free this auxtrace record structure + * @snapshot_start: starting a snapshot + * @snapshot_finish: finishing a snapshot + * @find_snapshot: find data to snapshot within auxtrace mmap + * @parse_snapshot_options: parse snapshot options * @reference: provide a 64-bit reference number for auxtrace_event * @read_finish: called after reading from an auxtrace mmap */ @@ -289,12 +293,36 @@ struct auxtrace_record { struct auxtrace_info_event *auxtrace_info, size_t priv_size); void (*free)(struct auxtrace_record *itr); + int (*snapshot_start)(struct auxtrace_record *itr); + int (*snapshot_finish)(struct auxtrace_record *itr); + int (*find_snapshot)(struct auxtrace_record *itr, int idx, + struct auxtrace_mmap *mm, unsigned char *data, + u64 *head, u64 *old); + int (*parse_snapshot_options)(struct auxtrace_record *itr, + struct record_opts *opts, + const char *str); u64 (*reference)(struct auxtrace_record *itr); int (*read_finish)(struct auxtrace_record *itr, int idx); }; #ifdef HAVE_AUXTRACE_SUPPORT +/* + * In snapshot mode the mmapped page is read-only which makes using + * __sync_val_compare_and_swap() problematic. However, snapshot mode expects + * the buffer is not updated while the snapshot is made (e.g. Intel PT disables + * the event) so there is not a race anyway. + */ +static inline u64 auxtrace_mmap__read_snapshot_head(struct auxtrace_mmap *mm) +{ + struct perf_event_mmap_page *pc = mm->userpg; + u64 head = ACCESS_ONCE(pc->aux_head); + + /* Ensure all reads are done after we read the head */ + rmb(); + return head; +} + static inline u64 auxtrace_mmap__read_head(struct auxtrace_mmap *mm) { struct perf_event_mmap_page *pc = mm->userpg; @@ -346,6 +374,11 @@ typedef int (*process_auxtrace_t)(struct perf_tool *tool, int auxtrace_mmap__read(struct auxtrace_mmap *mm, struct auxtrace_record *itr, struct perf_tool *tool, process_auxtrace_t fn); +int auxtrace_mmap__read_snapshot(struct auxtrace_mmap *mm, + struct auxtrace_record *itr, + struct perf_tool *tool, process_auxtrace_t fn, + size_t snapshot_size); + int auxtrace_queues__init(struct auxtrace_queues *queues); int auxtrace_queues__add_event(struct auxtrace_queues *queues, struct perf_session *session, @@ -383,6 +416,9 @@ void *auxtrace_cache__lookup(struct auxtrace_cache *c, u32 key); struct auxtrace_record *auxtrace_record__init(struct perf_evlist *evlist, int *err); +int auxtrace_parse_snapshot_options(struct auxtrace_record *itr, + struct record_opts *opts, + const char *str); int auxtrace_record__options(struct auxtrace_record *itr, struct perf_evlist *evlist, struct record_opts *opts); @@ -392,6 +428,11 @@ int auxtrace_record__info_fill(struct auxtrace_record *itr, struct auxtrace_info_event *auxtrace_info, size_t priv_size); void auxtrace_record__free(struct auxtrace_record *itr); +int auxtrace_record__snapshot_start(struct auxtrace_record *itr); +int auxtrace_record__snapshot_finish(struct auxtrace_record *itr); +int auxtrace_record__find_snapshot(struct auxtrace_record *itr, int idx, + struct auxtrace_mmap *mm, + unsigned char *data, u64 *head, u64 *old); u64 auxtrace_record__reference(struct auxtrace_record *itr); int auxtrace_index__auxtrace_event(struct list_head *head, union perf_event *event, |