diff options
| author | Kyle Meyer <meyerk@hpe.com> | 2019-08-27 23:43:50 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2019-08-29 22:38:32 +0200 |
| commit | 8c7274691f0de5fb56f3b9fe9208ce7e515a2d2c (patch) | |
| tree | 69b70673aee9326752297bfdbaad7c52be9ec685 | |
| parent | perf session: Replace MAX_NR_CPUS with perf_env::nr_cpus_online (diff) | |
| download | linux-8c7274691f0de5fb56f3b9fe9208ce7e515a2d2c.tar.xz linux-8c7274691f0de5fb56f3b9fe9208ce7e515a2d2c.zip | |
perf machine: Replace MAX_NR_CPUS with perf_env::nr_cpus_online
nr_cpus, the number of CPUs online during a record session bound by
MAX_NR_CPUS, can be used as a dynamic alternative for MAX_NR_CPUS in
__machine__synthesize_threads and machine__set_current_tid.
Signed-off-by: Kyle Meyer <kyle.meyer@hpe.com>
Reviewed-by: Jiri Olsa <jolsa@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russ Anderson <russ.anderson@hpe.com>
Link: http://lore.kernel.org/lkml/20190827214352.94272-6-meyerk@stormcage.eag.rdlabs.hpecorp.net
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| -rw-r--r-- | tools/perf/util/machine.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c index 93483f1764d3..a1542b4c047b 100644 --- a/tools/perf/util/machine.c +++ b/tools/perf/util/machine.c @@ -2619,7 +2619,9 @@ int __machine__synthesize_threads(struct machine *machine, struct perf_tool *too pid_t machine__get_current_tid(struct machine *machine, int cpu) { - if (cpu < 0 || cpu >= MAX_NR_CPUS || !machine->current_tid) + int nr_cpus = min(machine->env->nr_cpus_online, MAX_NR_CPUS); + + if (cpu < 0 || cpu >= nr_cpus || !machine->current_tid) return -1; return machine->current_tid[cpu]; @@ -2629,6 +2631,7 @@ int machine__set_current_tid(struct machine *machine, int cpu, pid_t pid, pid_t tid) { struct thread *thread; + int nr_cpus = min(machine->env->nr_cpus_online, MAX_NR_CPUS); if (cpu < 0) return -EINVAL; @@ -2636,14 +2639,14 @@ int machine__set_current_tid(struct machine *machine, int cpu, pid_t pid, if (!machine->current_tid) { int i; - machine->current_tid = calloc(MAX_NR_CPUS, sizeof(pid_t)); + machine->current_tid = calloc(nr_cpus, sizeof(pid_t)); if (!machine->current_tid) return -ENOMEM; - for (i = 0; i < MAX_NR_CPUS; i++) + for (i = 0; i < nr_cpus; i++) machine->current_tid[i] = -1; } - if (cpu >= MAX_NR_CPUS) { + if (cpu >= nr_cpus) { pr_err("Requested CPU %d too large. ", cpu); pr_err("Consider raising MAX_NR_CPUS\n"); return -EINVAL; |