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authorAdrian Hunter <adrian.hunter@intel.com>2014-07-22 17:17:25 +0400
committerArnaldo Carvalho de Melo <acme@redhat.com>2014-07-23 18:35:43 +0400
commitb9d266baac0429f70df3f9cf751b045730d612e3 (patch)
treed4625908c8f0d9e972a489da208725f460048e4a /tools
parentbf49c35f630452d85c9cd7205a72df841e8d99b9 (diff)
downloadlinux-b9d266baac0429f70df3f9cf751b045730d612e3.tar.xz
perf machine: Add ability to record the current tid for each cpu
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> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1406035081-14301-17-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/util/machine.c46
-rw-r--r--tools/perf/util/machine.h5
2 files changed, 51 insertions, 0 deletions
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 93c8b6fbc799..cfc691000f13 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -45,6 +45,8 @@ 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;
}
@@ -104,6 +106,7 @@ void machine__exit(struct machine *machine)
dsos__delete(&machine->user_dsos);
dsos__delete(&machine->kernel_dsos);
zfree(&machine->root_dir);
+ zfree(&machine->current_tid);
}
void machine__delete(struct machine *machine)
@@ -1481,3 +1484,46 @@ int __machine__synthesize_threads(struct machine *machine, struct perf_tool *too
/* command specified */
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)
+{
+ struct thread *thread;
+
+ 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;
+
+ thread = machine__findnew_thread(machine, pid, tid);
+ if (!thread)
+ return -ENOMEM;
+
+ thread->cpu = cpu;
+
+ return 0;
+}
diff --git a/tools/perf/util/machine.h b/tools/perf/util/machine.h
index c8c74a119398..8771d0cbe9cb 100644
--- a/tools/perf/util/machine.h
+++ b/tools/perf/util/machine.h
@@ -33,6 +33,7 @@ struct machine {
struct map_groups kmaps;
struct map *vmlinux_maps[MAP__NR_TYPES];
symbol_filter_t symbol_filter;
+ pid_t *current_tid;
};
static inline
@@ -191,4 +192,8 @@ int machine__synthesize_threads(struct machine *machine, struct target *target,
perf_event__process, data_mmap);
}
+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 */