| Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| Andi Kleen | 44b1e60 | 2016-05-30 12:49:42 -0300 | [diff] [blame] | 2 | #include <stdio.h> |
| 3 | #include "api/fs/fs.h" |
| 4 | #include "util/group.h" |
| 5 | |
| 6 | /* |
| 7 | * Check whether we can use a group for top down. |
| 8 | * Without a group may get bad results due to multiplexing. |
| 9 | */ |
| 10 | bool arch_topdown_check_group(bool *warn) |
| 11 | { |
| 12 | int n; |
| 13 | |
| 14 | if (sysctl__read_int("kernel/nmi_watchdog", &n) < 0) |
| 15 | return false; |
| 16 | if (n > 0) { |
| 17 | *warn = true; |
| 18 | return false; |
| 19 | } |
| 20 | return true; |
| 21 | } |
| 22 | |
| 23 | void arch_topdown_group_warn(void) |
| 24 | { |
| 25 | fprintf(stderr, |
| 26 | "nmi_watchdog enabled with topdown. May give wrong results.\n" |
| 27 | "Disable with echo 0 > /proc/sys/kernel/nmi_watchdog\n"); |
| 28 | } |