perf evsel: Rename evsel__increase_rlimit to rlimit__increase_nofile

evsel__increase_rlimit() helper does nothing with evsel, and description
of the functionality is inaccurate, rename it and move to util/rlimit.c.

By the way, fix a checkppatch warning about misplaced license tag:

  WARNING: Misplaced SPDX-License-Identifier tag - use line 1 instead
  torvalds#160: FILE: tools/perf/util/rlimit.h:3:
  /* SPDX-License-Identifier: LGPL-2.1 */

No functional change.

Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
Link: https://lore.kernel.org/r/20231023033144.1011896-1-yangjihong1@huawei.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

tools/perf/util/data.c

@@ -17,7 +17,7 @@
 #include "util.h" // rm_rf_perf_data()
 #include "debug.h"
 #include "header.h"
-#include "evsel.h"
+#include "rlimit.h"
 #include <internal/lib.h>
 
 static void close_dir(struct perf_data_file *files, int nr)
@@ -64,7 +64,7 @@ int perf_data__create_dir(struct perf_data *data, int nr)
 			 * perf record needs at least 6 fds per CPU.
 			 * When we run out of them try to increase the limits.
 			 */
-			if (errno == EMFILE && evsel__increase_rlimit(&set_rlimit))
+			if (errno == EMFILE && rlimit__increase_nofile(&set_rlimit))
 				goto retry_open;
 
 			ret = -errno;

tools/perf/util/evsel.c

@@ -49,6 +49,7 @@
 #include "off_cpu.h"
 #include "pmu.h"
 #include "pmus.h"
+#include "rlimit.h"
 #include "../perf-sys.h"
 #include "util/parse-branch-options.h"
 #include "util/bpf-filter.h"
@@ -1989,33 +1990,6 @@ bool evsel__detect_missing_features(struct evsel *evsel)
 	}
 }
 
-bool evsel__increase_rlimit(enum rlimit_action *set_rlimit)
-{
-	int old_errno;
-	struct rlimit l;
-
-	if (*set_rlimit < INCREASED_MAX) {
-		old_errno = errno;
-
-		if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
-			if (*set_rlimit == NO_CHANGE) {
-				l.rlim_cur = l.rlim_max;
-			} else {
-				l.rlim_cur = l.rlim_max + 1000;
-				l.rlim_max = l.rlim_cur;
-			}
-			if (setrlimit(RLIMIT_NOFILE, &l) == 0) {
-				(*set_rlimit) += 1;
-				errno = old_errno;
-				return true;
-			}
-		}
-		errno = old_errno;
-	}
-
-	return false;
-}
-
 static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus,
 		struct perf_thread_map *threads,
 		int start_cpu_map_idx, int end_cpu_map_idx)
@@ -2143,7 +2117,7 @@ static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus,
 	 * perf stat needs between 5 and 22 fds per CPU. When we run out
 	 * of them try to increase the limits.
 	 */
-	if (err == -EMFILE && evsel__increase_rlimit(&set_rlimit))
+	if (err == -EMFILE && rlimit__increase_nofile(&set_rlimit))
 		goto retry_open;
 
 	if (err != -EINVAL || idx > 0 || thread > 0)

tools/perf/util/evsel.h

@@ -330,9 +330,6 @@ int evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus,
 		struct perf_thread_map *threads);
 bool evsel__detect_missing_features(struct evsel *evsel);
 
-enum rlimit_action { NO_CHANGE, SET_TO_MAX, INCREASED_MAX };
-bool evsel__increase_rlimit(enum rlimit_action *set_rlimit);
-
 bool evsel__precise_ip_fallback(struct evsel *evsel);
 
 struct perf_sample;

tools/perf/util/rlimit.c

@@ -1,5 +1,6 @@
 /* SPDX-License-Identifier: LGPL-2.1 */
 
+#include <errno.h>
 #include "util/debug.h"
 #include "util/rlimit.h"
 #include <sys/time.h>
@@ -27,3 +28,30 @@ void rlimit__bump_memlock(void)
 		}
 	}
 }
+
+bool rlimit__increase_nofile(enum rlimit_action *set_rlimit)
+{
+	int old_errno;
+	struct rlimit l;
+
+	if (*set_rlimit < INCREASED_MAX) {
+		old_errno = errno;
+
+		if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
+			if (*set_rlimit == NO_CHANGE) {
+				l.rlim_cur = l.rlim_max;
+			} else {
+				l.rlim_cur = l.rlim_max + 1000;
+				l.rlim_max = l.rlim_cur;
+			}
+			if (setrlimit(RLIMIT_NOFILE, &l) == 0) {
+				(*set_rlimit) += 1;
+				errno = old_errno;
+				return true;
+			}
+		}
+		errno = old_errno;
+	}
+
+	return false;
+}

tools/perf/util/rlimit.h

@@ -1,6 +1,15 @@
+/* SPDX-License-Identifier: LGPL-2.1 */
 #ifndef __PERF_RLIMIT_H_
 #define __PERF_RLIMIT_H_
-/* SPDX-License-Identifier: LGPL-2.1 */
+
+enum rlimit_action {
+	NO_CHANGE,
+	SET_TO_MAX,
+	INCREASED_MAX
+};
 
 void rlimit__bump_memlock(void);
+
+bool rlimit__increase_nofile(enum rlimit_action *set_rlimit);
+
 #endif // __PERF_RLIMIT_H_