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1// SPDX-License-Identifier: GPL-2.0-only2#include <string.h>3#include "api/fs/fs.h"4#include "cputopo.h"5#include "smt.h"6 7bool smt_on(void)8{9 static bool cached;10 static bool cached_result;11 int fs_value;12 13 if (cached)14 return cached_result;15 16 if (sysfs__read_int("devices/system/cpu/smt/active", &fs_value) >= 0)17 cached_result = (fs_value == 1);18 else19 cached_result = cpu_topology__smt_on(online_topology());20 21 cached = true;22 return cached_result;23}24 25bool core_wide(bool system_wide, const char *user_requested_cpu_list)26{27 /* If not everything running on a core is being recorded then we can't use core_wide. */28 if (!system_wide)29 return false;30 31 /* Cheap case that SMT is disabled and therefore we're inherently core_wide. */32 if (!smt_on())33 return true;34 35 return cpu_topology__core_wide(online_topology(), user_requested_cpu_list);36}37