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perf tools: Fix reading new topology attribute "core_cpus"

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Check if access("devices/system/cpu/cpu%d/topology/core_cpus", F_OK)
fails, which will happen unless the current directory is "/sys".

Simply try to read this file first.

Fixes: 0ccdb8407a ("perf tools: Apply new CPU topology sysfs attributes")
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Dmitry Monakhov <dmtrmonakhov@yandex-team.ru>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/158817718710.747528.11009278875028211991.stgit@buzz
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Konstantin Khlebnikov 2020-04-29 19:19:47 +03:00 committed by Arnaldo Carvalho de Melo
parent 4599d29212
commit 846de4371f
1 changed files with 3 additions and 3 deletions
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6
tools/perf/util/smt.c
View File

@ -24,13 +24,13 @@ int smt_on(void)
snprintf(fn, sizeof fn,
"devices/system/cpu/cpu%d/topology/core_cpus", cpu);
if (access(fn, F_OK) == -1) {
if (sysfs__read_str(fn, &str, &strlen) < 0) {
snprintf(fn, sizeof fn,
"devices/system/cpu/cpu%d/topology/thread_siblings",
cpu);
if (sysfs__read_str(fn, &str, &strlen) < 0)
continue;
}
if (sysfs__read_str(fn, &str, &strlen) < 0)
continue;
/* Entry is hex, but does not have 0x, so need custom parser */
siblings = strtoull(str, NULL, 16);
free(str);