lkml.org 
[lkml]   [2019]   [Aug]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v3 5/6] perf/util/machine: Replace MAX_NR_CPUS with nr_cpus_online
Date
nr_cpus_online, the number of CPUs online during a record session, can be
used as a dynamic alternative for MAX_NR_CPUS in __machine__synthesize_threads
and machine__set_current_tid.

Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: linux-kernel@vger.kernel.org
Cc: Russ Anderson <russ.anderson@hpe.com>
Signed-off-by: Kyle Meyer <kyle.meyer@hpe.com>
---
tools/perf/util/machine.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 5734460fc89e..d255634bac74 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -2616,7 +2616,9 @@ 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_online = machine->env->nr_cpus_online;
+
+ if (cpu < 0 || cpu >= nr_cpus_online || !machine->current_tid)
return -1;

return machine->current_tid[cpu];
@@ -2626,6 +2628,7 @@ int machine__set_current_tid(struct machine *machine, int cpu, pid_t pid,
pid_t tid)
{
struct thread *thread;
+ int nr_cpus_online = machine->env->nr_cpus_online;

if (cpu < 0)
return -EINVAL;
@@ -2633,16 +2636,15 @@ 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_online, sizeof(pid_t));
if (!machine->current_tid)
return -ENOMEM;
- for (i = 0; i < MAX_NR_CPUS; i++)
+ for (i = 0; i < nr_cpus_online; i++)
machine->current_tid[i] = -1;
}

- if (cpu >= MAX_NR_CPUS) {
+ if (cpu >= nr_cpus_online) {
pr_err("Requested CPU %d too large. ", cpu);
- pr_err("Consider raising MAX_NR_CPUS\n");
return -EINVAL;
}

--
2.12.3
\
 
 \ /
  Last update: 2019-08-19 22:24    [W:0.020 / U:0.880 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site