From 37f68a2940558b4f6f8e51b7b1d00f084b4bdde2 Mon Sep 17 00:00:00 2001
From: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Date: Tue, 24 Jan 2023 10:39:53 -0800
Subject: [PATCH] tools/power/turbostat: Move process to root cgroup
Git-commit: 37f68a2940558b4f6f8e51b7b1d00f084b4bdde2
Patch-mainline: v6.7-rc2
References: bsc#1218556
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 <srinivas.pandruvada@linux.intel.com>
Tested-by: Zhang Rui <rui.zhang@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
tools/power/x86/turbostat/turbostat.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index 0ef6fba118b1..fea63d9d8e02 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);
--
2.35.3