From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- tools/perf/arch/x86/util/group.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) create mode 100644 tools/perf/arch/x86/util/group.c (limited to 'tools/perf/arch/x86/util/group.c') diff --git a/tools/perf/arch/x86/util/group.c b/tools/perf/arch/x86/util/group.c new file mode 100644 index 000000000..e2f8034b8 --- /dev/null +++ b/tools/perf/arch/x86/util/group.c @@ -0,0 +1,28 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include "api/fs/fs.h" +#include "util/group.h" + +/* + * Check whether we can use a group for top down. + * Without a group may get bad results due to multiplexing. + */ +bool arch_topdown_check_group(bool *warn) +{ + int n; + + if (sysctl__read_int("kernel/nmi_watchdog", &n) < 0) + return false; + if (n > 0) { + *warn = true; + return false; + } + return true; +} + +void arch_topdown_group_warn(void) +{ + fprintf(stderr, + "nmi_watchdog enabled with topdown. May give wrong results.\n" + "Disable with echo 0 > /proc/sys/kernel/nmi_watchdog\n"); +} -- cgit v1.2.3