diff options
Diffstat (limited to 'tools/perf/util/evlist.h')
| -rw-r--r-- | tools/perf/util/evlist.h | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h index b33c5d67410a..8b9c35efea67 100644 --- a/tools/perf/util/evlist.h +++ b/tools/perf/util/evlist.h @@ -11,7 +11,7 @@ #include <internal/evlist.h> #include "events_stats.h" #include "evsel.h" -#include "mmap.h" +#include <pthread.h> #include <signal.h> #include <unistd.h> @@ -20,6 +20,34 @@ 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, +}; + #define PERF_EVLIST__HLIST_BITS 8 #define PERF_EVLIST__HLIST_SIZE (1 << PERF_EVLIST__HLIST_BITS) |