From: Srinivas Pandruvada Date: Tue, 24 Jan 2023 18:39:53 +0000 (-0800) Subject: tools/power/turbostat: Move process to root cgroup X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=37f68a2940558b4f6f8e51b7b1d00f084b4bdde2;p=linux.git tools/power/turbostat: Move process to root cgroup When available CPUs are reduced via cgroup cpuset controller, turbostat will exit with errors (For example): get_counters: Could not migrate to CPU 0 turbostat: re-initialized with num_cpus 20 get_counters: Could not migrate to CPU 0 turbostat: re-initialized with num_cpus 20 Move the turbostat to root cgroup, which has every CPU. Writing the value 0 to a cgroup.procs file causes the writing process to be moved to the corresponding cgroup. Signed-off-by: Srinivas Pandruvada Tested-by: Zhang Rui --- diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c index 0ef6fba118b1b..fea63d9d8e02d 100644 --- a/tools/power/x86/turbostat/turbostat.c +++ b/tools/power/x86/turbostat/turbostat.c @@ -6666,6 +6666,19 @@ void cmdline(int argc, char **argv) int main(int argc, char **argv) { + int fd, ret; + + fd = open("/sys/fs/cgroup/cgroup.procs", O_WRONLY); + if (fd < 0) + goto skip_cgroup_setting; + + ret = write(fd, "0\n", 2); + if (ret == -1) + perror("Can't update cgroup\n"); + + close(fd); + +skip_cgroup_setting: outf = stderr; cmdline(argc, argv);