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perf pmu: Avoid a path name copy 

Rather than read a base path and append into a 2nd path, read the base
path directly into output buffer and append to that.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Gaosheng Cui <cuigaosheng1@huawei.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jing Zhang <renyu.zj@linux.alibaba.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230823080828.1460376-3-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2023-08-23 01:08:05 -07:00 committed by Arnaldo Carvalho de Melo
parent 91e2e9f0b8
commit e1a3aad31c
1 changed files with 7 additions and 5 deletions
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12
tools/perf/util/pmu.c
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@ -1756,17 +1756,19 @@ int perf_pmu__event_source_devices_fd(void)
* then pathname will be filled with
* "/sys/bus/event_source/devices/cs_etm/format"
*
* Return 0 if the sysfs mountpoint couldn't be found or if no
* characters were written.
* Return 0 if the sysfs mountpoint couldn't be found, if no characters were
* written or if the buffer size is exceeded.
*/
int perf_pmu__pathname_scnprintf(char *buf, size_t size,
const char *pmu_name, const char *filename)
{
char base_path[PATH_MAX];
size_t len;
if (!perf_pmu__event_source_devices_scnprintf(base_path, sizeof(base_path)))
len = perf_pmu__event_source_devices_scnprintf(buf, size);
if (!len || (len + strlen(pmu_name) + strlen(filename) + 1) >= size)
return 0;
return scnprintf(buf, size, "%s%s/%s", base_path, pmu_name, filename);
return scnprintf(buf + len, size - len, "%s/%s", pmu_name, filename);
}
int perf_pmu__pathname_fd(int dirfd, const char *pmu_name, const char *filename, int flags)