| From | Alexander Shishkin <> | Subject | [PATCH v0 15/71] perf tools: Add ability to record the current tid for each cpu | Date | Wed, 11 Dec 2013 14:36:27 +0200 |
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From: Adrian Hunter <adrian.hunter@intel.com>
Add an array to struct machine to store the current tid running on each cpu. Add machine functions to get / set the tid for a cpu.
This will be used to determine the tid when decoding a per-cpu Instruction Trace.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> --- tools/perf/util/machine.c | 39 +++++++++++++++++++++++++++++++++++++++ tools/perf/util/machine.h | 4 ++++ 2 files changed, 43 insertions(+)
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c index 52fbfb6..a04210d 100644 --- a/tools/perf/util/machine.c +++ b/tools/perf/util/machine.c @@ -43,6 +43,8 @@ int machine__init(struct machine *machine, const char *root_dir, pid_t pid) thread__set_comm(thread, comm, 0); } + machine->current_tid = NULL; + return 0; } @@ -103,6 +105,8 @@ void machine__exit(struct machine *machine) dsos__delete(&machine->kernel_dsos); free(machine->root_dir); machine->root_dir = NULL; + free(machine->current_tid); + machine->current_tid = NULL; } void machine__delete(struct machine *machine) @@ -1438,3 +1442,38 @@ int machine__set_thread_cpu(struct machine *machine, pid_t pid, pid_t tid, return 0; } + +pid_t machine__get_current_tid(struct machine *machine, int cpu) +{ + if (cpu < 0 || cpu >= MAX_NR_CPUS || !machine->current_tid) + return -1; + + return machine->current_tid[cpu]; +} + +int machine__set_current_tid(struct machine *machine, int cpu, pid_t pid, + pid_t tid) +{ + if (cpu < 0) + return -EINVAL; + + if (!machine->current_tid) { + int i; + + machine->current_tid = calloc(MAX_NR_CPUS, sizeof(pid_t)); + if (!machine->current_tid) + return -ENOMEM; + for (i = 0; i < MAX_NR_CPUS; i++) + machine->current_tid[i] = -1; + } + + if (cpu >= MAX_NR_CPUS) { + pr_err("Requested CPU %d too large. ", cpu); + pr_err("Consider raising MAX_NR_CPUS\n"); + return -EINVAL; + } + + machine->current_tid[cpu] = tid; + + return machine__set_thread_cpu(machine, pid, tid, cpu); +} diff --git a/tools/perf/util/machine.h b/tools/perf/util/machine.h index 27486af..aaad99a 100644 --- a/tools/perf/util/machine.h +++ b/tools/perf/util/machine.h @@ -31,6 +31,7 @@ struct machine { struct map_groups kmaps; struct map *vmlinux_maps[MAP__NR_TYPES]; symbol_filter_t symbol_filter; + pid_t *current_tid; }; static inline @@ -194,5 +195,8 @@ pid_t machine__get_thread_pid(struct machine *machine, pid_t tid); int machine__get_thread_cpu(struct machine *machine, pid_t tid, pid_t *pid); int machine__set_thread_cpu(struct machine *machine, pid_t pid, pid_t tid, int cpu); +pid_t machine__get_current_tid(struct machine *machine, int cpu); +int machine__set_current_tid(struct machine *machine, int cpu, pid_t pid, + pid_t tid); #endif /* __PERF_MACHINE_H */ -- 1.8.5.1
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