tools/perf/util/cacheline.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include "cacheline.h"
   3 #include <unistd.h>
   4
   5 #ifdef _SC_LEVEL1_DCACHE_LINESIZE
   6 #define cache_line_size(cacheline_sizep) *cacheline_sizep = sysconf(_SC_LEVEL1_DCACHE_LINESIZE)
   7 #else
   8 #include <api/fs/fs.h>
   9 #include "debug.h"
  10 static void cache_line_size(int *cacheline_sizep)
  11 {
  12         if (sysfs__read_int("devices/system/cpu/cpu0/cache/index0/coherency_line_size", cacheline_sizep))
  13                 pr_debug("cannot determine cache line size");
  14 }
  15 #endif
  16
  17 int cacheline_size(void)
  18 {
  19         static int size;
  20
  21         if (!size)
  22                 cache_line_size(&size);
  23
  24         return size;
  25 }