1 // SPDX-License-Identifier: GPL-2.0 2 #include "cacheline.h" 3 #include "../perf.h" 4 #include <unistd.h> 5 6 #ifdef _SC_LEVEL1_DCACHE_LINESIZE 7 #define cache_line_size(cacheline_sizep) *cacheline_sizep = sysconf(_SC_LEVEL1_DCACHE_LINESIZE) 8 #else 9 #include <api/fs/fs.h> 10 #include "debug.h" 11 static void cache_line_size(int *cacheline_sizep) 12 { 13 if (sysfs__read_int("devices/system/cpu/cpu0/cache/index0/coherency_line_size", cacheline_sizep)) 14 pr_debug("cannot determine cache line size"); 15 } 16 #endif 17 18 int cacheline_size(void) 19 { 20 static int size; 21 22 if (!size) 23 cache_line_size(&size); 24 25 return size; 26 } 27