| 1 | // SPDX-License-Identifier: GPL-2.0-only |
|---|---|
| 2 | #include <string.h> |
| 3 | #include "api/fs/fs.h" |
| 4 | #include "cputopo.h" |
| 5 | #include "smt.h" |
| 6 | |
| 7 | bool 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 | else |
| 19 | cached_result = cpu_topology__smt_on(topology: online_topology()); |
| 20 | |
| 21 | cached = true; |
| 22 | return cached_result; |
| 23 | } |
| 24 | |
| 25 | bool 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(topology: online_topology(), user_requested_cpu_list); |
| 36 | } |
| 37 |