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perf machine: Add ability to record the current tid for each cpu

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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>
This commit is contained in:
Adrian Hunter 2014-07-22 16:17:25 +03:00 committed by Arnaldo Carvalho de Melo
parent bf49c35f63
commit b9d266baac
2 changed files with 51 additions and 0 deletions
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46
tools/perf/util/machine.c
View File

@ -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;
}

5
tools/perf/util/machine.h
View File

@ -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 */