1 files changed, 26 insertions, 0 deletions

diff --git a/tools/perf/util/cacheline.c b/tools/perf/util/cacheline.c
new file mode 100644
index 000000000000..9361d3f61f75
--- /dev/null
+++ b/tools/perf/util/cacheline.c
@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "cacheline.h"
+#include "../perf.h"
+#include <unistd.h>
+
+#ifdef _SC_LEVEL1_DCACHE_LINESIZE
+#define cache_line_size(cacheline_sizep) *cacheline_sizep = sysconf(_SC_LEVEL1_DCACHE_LINESIZE)
+#else
+#include <api/fs/fs.h>
+#include "debug.h"
+static void cache_line_size(int *cacheline_sizep)
+{
+        if (sysfs__read_int("devices/system/cpu/cpu0/cache/index0/coherency_line_size", cacheline_sizep))
+                pr_debug("cannot determine cache line size");
+}
+#endif
+
+int cacheline_size(void)
+{
+        static int size;
+
+        if (!size)
+                cache_line_size(&size);
+
+        return size;
+}