// SPDX-License-Identifier: GPL-2.0-only #include <string.h> #include "api/fs/fs.h" #include "cputopo.h" #include "smt.h" bool smt_on(void) { static bool cached; static bool cached_result; int fs_value; if (cached) return cached_result; if (sysfs__read_int("devices/system/cpu/smt/active", &fs_value) >= 0) cached_result = (fs_value == 1); else cached_result = cpu_topology__smt_on(online_topology()); cached = true; return cached_result; } bool core_wide(bool system_wide, const char *user_requested_cpu_list) { /* If not everything running on a core is being recorded then we can't use core_wide. */ if (!system_wide) return false; /* Cheap case that SMT is disabled and therefore we're inherently core_wide. */ if (!smt_on()) return true; return cpu_topology__core_wide(online_topology(), user_requested_cpu_list); }