From: Adrian Hunter <adrian.hunter@intel.com>
To: Arnaldo Carvalho de Melo <acme@kernel.org>, Jiri Olsa <jolsa@redhat.com>
Cc: linux-kernel@vger.kernel.org, Kan Liang <kan.liang@linux.intel.com>
Subject: [PATCH] perf intel-pt: Fix 'CPU too large' error
Date: Thu, 7 Jan 2021 19:41:59 +0200 [thread overview]
Message-ID: <20210107174159.24897-1-adrian.hunter@intel.com> (raw)
In some cases, the number of cpus (nr_cpus_online) is confused with the
maximum cpu number (nr_cpus_avail), which results in the error in the
example below:
Example on system with 8 cpus:
Before:
# echo 0 > /sys/devices/system/cpu/cpu2/online
# ./perf record --kcore -e intel_pt// taskset --cpu-list 7 uname
Linux
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.147 MB perf.data ]
# ./perf script --itrace=e
Requested CPU 7 too large. Consider raising MAX_NR_CPUS
0x25908 [0x8]: failed to process type: 68 [Invalid argument]
After:
# ./perf script --itrace=e
#
Fixes: 8c7274691f0d ("perf machine: Replace MAX_NR_CPUS with perf_env::nr_cpus_online")
Fixes: 7df4e36a4785 ("perf session: Replace MAX_NR_CPUS with perf_env::nr_cpus_online")
Cc: stable@vger.kernel.org
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
tools/perf/util/machine.c | 4 ++--
tools/perf/util/session.c | 2 +-
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 1ae32a81639c..46844599d25d 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -2977,7 +2977,7 @@ int machines__for_each_thread(struct machines *machines,
pid_t machine__get_current_tid(struct machine *machine, int cpu)
{
- int nr_cpus = min(machine->env->nr_cpus_online, MAX_NR_CPUS);
+ int nr_cpus = min(machine->env->nr_cpus_avail, MAX_NR_CPUS);
if (cpu < 0 || cpu >= nr_cpus || !machine->current_tid)
return -1;
@@ -2989,7 +2989,7 @@ 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);
+ int nr_cpus = min(machine->env->nr_cpus_avail, MAX_NR_CPUS);
if (cpu < 0)
return -EINVAL;
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 3b3c50b12791..2777c2df7d87 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -2391,7 +2391,7 @@ int perf_session__cpu_bitmap(struct perf_session *session,
{
int i, err = -1;
struct perf_cpu_map *map;
- int nr_cpus = min(session->header.env.nr_cpus_online, MAX_NR_CPUS);
+ int nr_cpus = min(session->header.env.nr_cpus_avail, MAX_NR_CPUS);
for (i = 0; i < PERF_TYPE_MAX; ++i) {
struct evsel *evsel;
--
2.17.1
next reply other threads:[~2021-01-07 17:43 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-07 17:41 Adrian Hunter [this message]
2021-01-07 20:46 ` [PATCH] perf intel-pt: Fix 'CPU too large' error Liang, Kan
2021-01-15 19:33 ` Arnaldo Carvalho de Melo
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