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Message-Id: <20241107162035.52206-3-irogers@google.com>
Date: Thu, 7 Nov 2024 08:20:29 -0800
From: Ian Rogers <irogers@...gle.com>
To: John Garry <john.g.garry@...cle.com>, Will Deacon <will@...nel.org>,
James Clark <james.clark@...aro.org>, Mike Leach <mike.leach@...aro.org>,
Leo Yan <leo.yan@...ux.dev>, Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>,
Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>,
Kan Liang <kan.liang@...ux.intel.com>, Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
Huacai Chen <chenhuacai@...nel.org>, Bibo Mao <maobibo@...ngson.cn>,
Athira Rajeev <atrajeev@...ux.vnet.ibm.com>, Ben Zong-You Xie <ben717@...estech.com>,
Alexandre Ghiti <alexghiti@...osinc.com>, Sandipan Das <sandipan.das@....com>,
Benjamin Gray <bgray@...ux.ibm.com>, Xu Yang <xu.yang_2@....com>,
Ravi Bangoria <ravi.bangoria@....com>,
"Clément Le Goffic" <clement.legoffic@...s.st.com>, Yicong Yang <yangyicong@...ilicon.com>,
"Masami Hiramatsu (Google)" <mhiramat@...nel.org>, Dima Kogan <dima@...retsauce.net>,
"Dr. David Alan Gilbert" <linux@...blig.org>, linux-arm-kernel@...ts.infradead.org,
linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-riscv@...ts.infradead.org
Subject: [PATCH v2 2/8] perf header: Move is_cpu_online to numa bench
The helper function is only used in the NUMA benchmark as typically
online CPUs are determined through
perf_cpu_map__new_online_cpus(). Reduce the scope of the function for
now.
Signed-off-by: Ian Rogers <irogers@...gle.com>
---
tools/perf/bench/numa.c | 53 ++++++++++++++++++++++++++++++++++++++++
tools/perf/util/header.c | 51 --------------------------------------
tools/perf/util/header.h | 1 -
3 files changed, 53 insertions(+), 52 deletions(-)
diff --git a/tools/perf/bench/numa.c b/tools/perf/bench/numa.c
index 1fbd7c947abc..19be2aaf4dc0 100644
--- a/tools/perf/bench/numa.c
+++ b/tools/perf/bench/numa.c
@@ -27,6 +27,7 @@
#include <sys/resource.h>
#include <sys/wait.h>
#include <sys/prctl.h>
+#include <sys/stat.h>
#include <sys/types.h>
#include <linux/kernel.h>
#include <linux/time64.h>
@@ -35,6 +36,7 @@
#include "../util/header.h"
#include "../util/mutex.h"
+#include <api/fs/fs.h>
#include <numa.h>
#include <numaif.h>
@@ -533,6 +535,57 @@ static int parse_cpu_list(const char *arg)
return 0;
}
+/*
+ * Check whether a CPU is online
+ *
+ * Returns:
+ * 1 -> if CPU is online
+ * 0 -> if CPU is offline
+ * -1 -> error case
+ */
+static int is_cpu_online(unsigned int cpu)
+{
+ char *str;
+ size_t strlen;
+ char buf[256];
+ int status = -1;
+ struct stat statbuf;
+
+ snprintf(buf, sizeof(buf),
+ "/sys/devices/system/cpu/cpu%d", cpu);
+ if (stat(buf, &statbuf) != 0)
+ return 0;
+
+ /*
+ * Check if /sys/devices/system/cpu/cpux/online file
+ * exists. Some cases cpu0 won't have online file since
+ * it is not expected to be turned off generally.
+ * In kernels without CONFIG_HOTPLUG_CPU, this
+ * file won't exist
+ */
+ snprintf(buf, sizeof(buf),
+ "/sys/devices/system/cpu/cpu%d/online", cpu);
+ if (stat(buf, &statbuf) != 0)
+ return 1;
+
+ /*
+ * Read online file using sysfs__read_str.
+ * If read or open fails, return -1.
+ * If read succeeds, return value from file
+ * which gets stored in "str"
+ */
+ snprintf(buf, sizeof(buf),
+ "devices/system/cpu/cpu%d/online", cpu);
+
+ if (sysfs__read_str(buf, &str, &strlen) < 0)
+ return status;
+
+ status = atoi(str);
+
+ free(str);
+ return status;
+}
+
static int parse_setup_cpu_list(void)
{
struct thread_data *td;
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index a6386d12afd7..55c28e4377ec 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -987,57 +987,6 @@ static int write_dir_format(struct feat_fd *ff,
return do_write(ff, &data->dir.version, sizeof(data->dir.version));
}
-/*
- * Check whether a CPU is online
- *
- * Returns:
- * 1 -> if CPU is online
- * 0 -> if CPU is offline
- * -1 -> error case
- */
-int is_cpu_online(unsigned int cpu)
-{
- char *str;
- size_t strlen;
- char buf[256];
- int status = -1;
- struct stat statbuf;
-
- snprintf(buf, sizeof(buf),
- "/sys/devices/system/cpu/cpu%d", cpu);
- if (stat(buf, &statbuf) != 0)
- return 0;
-
- /*
- * Check if /sys/devices/system/cpu/cpux/online file
- * exists. Some cases cpu0 won't have online file since
- * it is not expected to be turned off generally.
- * In kernels without CONFIG_HOTPLUG_CPU, this
- * file won't exist
- */
- snprintf(buf, sizeof(buf),
- "/sys/devices/system/cpu/cpu%d/online", cpu);
- if (stat(buf, &statbuf) != 0)
- return 1;
-
- /*
- * Read online file using sysfs__read_str.
- * If read or open fails, return -1.
- * If read succeeds, return value from file
- * which gets stored in "str"
- */
- snprintf(buf, sizeof(buf),
- "devices/system/cpu/cpu%d/online", cpu);
-
- if (sysfs__read_str(buf, &str, &strlen) < 0)
- return status;
-
- status = atoi(str);
-
- free(str);
- return status;
-}
-
#ifdef HAVE_LIBBPF_SUPPORT
static int write_bpf_prog_info(struct feat_fd *ff,
struct evlist *evlist __maybe_unused)
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index a63a361f20f4..e91e89d22537 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -196,7 +196,6 @@ int write_padded(struct feat_fd *fd, const void *bf,
#define MAX_CACHE_LVL 4
-int is_cpu_online(unsigned int cpu);
int build_caches_for_cpu(u32 cpu, struct cpu_cache_level caches[], u32 *cntp);
/*
--
2.47.0.199.ga7371fff76-goog
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