1 | // SPDX-License-Identifier: GPL-2.0-only |
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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 |