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Message-Id: <20230524221831.1741381-17-irogers@google.com>
Date: Wed, 24 May 2023 15:18:12 -0700
From: Ian Rogers <irogers@...gle.com>
To: Suzuki K Poulose <suzuki.poulose@....com>,
Mike Leach <mike.leach@...aro.org>,
Leo Yan <leo.yan@...aro.org>,
John Garry <john.g.garry@...cle.com>,
Will Deacon <will@...nel.org>,
James Clark <james.clark@....com>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>,
Kajol Jain <kjain@...ux.ibm.com>,
Jing Zhang <renyu.zj@...ux.alibaba.com>,
Kan Liang <kan.liang@...ux.intel.com>,
Zhengjun Xing <zhengjun.xing@...ux.intel.com>,
Ravi Bangoria <ravi.bangoria@....com>,
Madhavan Srinivasan <maddy@...ux.ibm.com>,
Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
Ming Wang <wangming01@...ngson.cn>,
Huacai Chen <chenhuacai@...nel.org>,
Sandipan Das <sandipan.das@....com>,
Dmitrii Dolgov <9erthalion6@...il.com>,
Sean Christopherson <seanjc@...gle.com>,
Ali Saidi <alisaidi@...zon.com>, Rob Herring <robh@...nel.org>,
Thomas Richter <tmricht@...ux.ibm.com>,
Kang Minchul <tegongkang@...il.com>,
linux-kernel@...r.kernel.org, coresight@...ts.linaro.org,
linux-arm-kernel@...ts.infradead.org,
linux-perf-users@...r.kernel.org
Subject: [PATCH v3 16/35] perf pmu: Remove perf_pmu__hybrid_mounted
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. pmu_lookup will attempt to read the cpus file too and so
the check can be folded into this.
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.
Signed-off-by: Ian Rogers <irogers@...gle.com>
---
tools/perf/util/pmu-hybrid.c | 15 +--------------
tools/perf/util/pmu-hybrid.h | 3 ---
tools/perf/util/pmu.c | 26 ++++++++++++++------------
3 files changed, 15 insertions(+), 29 deletions(-)
diff --git a/tools/perf/util/pmu-hybrid.c b/tools/perf/util/pmu-hybrid.c
index bc4cb0738c35..7fe943dd3217 100644
--- a/tools/perf/util/pmu-hybrid.c
+++ b/tools/perf/util/pmu-hybrid.c
@@ -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;
diff --git a/tools/perf/util/pmu-hybrid.h b/tools/perf/util/pmu-hybrid.h
index 206b94931531..8dbcae935020 100644
--- a/tools/perf/util/pmu-hybrid.h
+++ b/tools/perf/util/pmu-hybrid.h
@@ -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)
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index cd94abe7a87a..e9f3e6a777c0 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -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;
@@ -900,6 +897,16 @@ static int pmu_max_precise(int dirfd, struct perf_pmu *pmu)
return max_precise;
}
+/**
+ * perf_pmu__skip_empty_cpus() - should pmu_lookup skip the named PMU if the
+ * cpus or cpumask file isn't present?
+ * @name: Name of PMU.
+ */
+static bool perf_pmu__skip_empty_cpus(const char *name)
+{
+ return !strcmp(name, "cpu_core") || !strcmp(name, "cpu_atom");
+}
+
static struct perf_pmu *pmu_lookup(int dirfd, const char *lookup_name)
{
struct perf_pmu *pmu;
@@ -907,15 +914,8 @@ 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
@@ -935,8 +935,10 @@ static struct perf_pmu *pmu_lookup(int dirfd, const char *lookup_name)
return NULL;
pmu->cpus = pmu_cpumask(dirfd, name);
- pmu->name = strdup(name);
+ if (!pmu->cpus && perf_pmu__skip_empty_cpus(name))
+ goto err;
+ pmu->name = strdup(name);
if (!pmu->name)
goto err;
@@ -967,7 +969,7 @@ 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);
--
2.40.1.698.g37aff9b760-goog
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