group.c

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// SPDX-License-Identifier: GPL-2.0
#include <stdio.h>
#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");
}