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perf pmu: Remove perf_pmu__hybrid_mounted

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perf_pmu__hybrid_mounted is used to detect whether cpu_core or
cpu_atom is mounted with a non-empty cpus file by
pmu_lookup. Discussion [1] showed the empty cpus file check to be
redundant and so pmu_lookup needn't have a call to
perf_pmu__hybrid_mounted.

Checking hybrid_mounted in pmu_is_uncore is redundant as the next
cpumask read will fail returning false.

Reduce the scope of perf_pmu__find_hybrid_pmu by making it static.

[1] https://lore.kernel.org/lkml/20230524221831.1741381-17-irogers@google.com/

Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ali Saidi <alisaidi@amazon.com>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Dmitrii Dolgov <9erthalion6@gmail.com>
Cc: Huacai Chen <chenhuacai@kernel.org>
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: Kang Minchul <tegongkang@gmail.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Ming Wang <wangming01@loongson.cn>
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>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Cc: coresight@lists.linaro.org
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20230527072210.2900565-16-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers
2023-05-27 00:21:51 -07:00
committed by Arnaldo Carvalho de Melo
parent b167b530eb
commit 4ced2c246e
3 changed files with 2 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
tools/perf/util/pmu-hybrid.c
View File

@@ -18,20 +18,7 @@
LIST_HEAD(perf_pmu__hybrid_pmus);
bool perf_pmu__hybrid_mounted(const char *name)
{
int cpu;
char pmu_name[PATH_MAX];
struct perf_pmu pmu = {.name = pmu_name};
if (strncmp(name, "cpu_", 4))
return false;
strlcpy(pmu_name, name, sizeof(pmu_name));
return perf_pmu__scan_file(&pmu, "cpus", "%u", &cpu) > 0;
}
struct perf_pmu *perf_pmu__find_hybrid_pmu(const char *name)
static struct perf_pmu *perf_pmu__find_hybrid_pmu(const char *name)
{
struct perf_pmu *pmu;

3
tools/perf/util/pmu-hybrid.h
View File

@@ -13,9 +13,6 @@ extern struct list_head perf_pmu__hybrid_pmus;
#define perf_pmu__for_each_hybrid_pmu(pmu) \
list_for_each_entry(pmu, &perf_pmu__hybrid_pmus, hybrid_list)
bool perf_pmu__hybrid_mounted(const char *name);
struct perf_pmu *perf_pmu__find_hybrid_pmu(const char *name);
bool perf_pmu__is_hybrid(const char *name);
static inline int perf_pmu__hybrid_pmu_num(void)

13
tools/perf/util/pmu.c
View File

@@ -617,9 +617,6 @@ static bool pmu_is_uncore(int dirfd, const char *name)
{
int fd;
if (perf_pmu__hybrid_mounted(name))
return false;
fd = perf_pmu__pathname_fd(dirfd, name, "cpumask", O_PATH);
if (fd < 0)
return false;
@@ -907,15 +904,8 @@ static struct perf_pmu *pmu_lookup(int dirfd, const char *lookup_name)
LIST_HEAD(aliases);
__u32 type;
char *name = pmu_find_real_name(lookup_name);
bool is_hybrid = perf_pmu__hybrid_mounted(name);
char *alias_name;
/*
* Check pmu name for hybrid and the pmu may be invalid in sysfs
*/
if (!strncmp(name, "cpu_", 4) && !is_hybrid)
return NULL;
/*
* The pmu data we store & need consists of the pmu
* type value and format definitions. Load both right
@@ -936,7 +926,6 @@ static struct perf_pmu *pmu_lookup(int dirfd, const char *lookup_name)
pmu->cpus = pmu_cpumask(dirfd, name);
pmu->name = strdup(name);
if (!pmu->name)
goto err;
@@ -967,7 +956,7 @@ static struct perf_pmu *pmu_lookup(int dirfd, const char *lookup_name)
list_splice(&aliases, &pmu->aliases);
list_add_tail(&pmu->list, &pmus);
if (is_hybrid)
if (!strcmp(name, "cpu_core") || !strcmp(name, "cpu_atom"))
list_add_tail(&pmu->hybrid_list, &perf_pmu__hybrid_pmus);
else
INIT_LIST_HEAD(&pmu->hybrid_list);