Hi,
On 2024-04-20 11:46, Xiu Jianfeng wrote:
Initializing top_cpuset.relax_domain_level and setting
CS_SCHED_LOAD_BALANCE to top_cpuset.flags in cpuset_init() could be
completed at the time of top_cpuset definition by compiler.
Signed-off-by: Xiu Jianfeng <xiujianfeng@xxxxxxxxxx>
---
kernel/cgroup/cpuset.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index d8d3439eda4e..e70008a1d86a 100644
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -369,8 +369,9 @@ static inline void notify_partition_change(struct cpuset *cs, int old_prs)
static struct cpuset top_cpuset = {
.flags = ((1 << CS_ONLINE) | (1 << CS_CPU_EXCLUSIVE) |
- (1 << CS_MEM_EXCLUSIVE)),
+ (1 << CS_MEM_EXCLUSIVE) | (1 < CS_SCHED_LOAD_BALANCE)),
You dropped a '<' for the bitwise shift, this causes bad cpu utilization
for me.
.partition_root_state = PRS_ROOT,
+ .relax_domain_level = -1,
.remote_sibling = LIST_HEAD_INIT(top_cpuset.remote_sibling),
};
@@ -4309,8 +4310,6 @@ int __init cpuset_init(void)
nodes_setall(top_cpuset.effective_mems);
fmeter_init(&top_cpuset.fmeter);
- set_bit(CS_SCHED_LOAD_BALANCE, &top_cpuset.flags);
- top_cpuset.relax_domain_level = -1;
INIT_LIST_HEAD(&remote_children);
BUG_ON(!alloc_cpumask_var(&cpus_attach, GFP_KERNEL));
Kind regards,
Klara Modin
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# first bad commit: [8996f93fc3880d000a0a0cb40c724d5830e140fd] cgroup/cpuset: Statically initialize more members of top_cpuset
From dfc9b104bb62ac7d0546be445ce6add9e6d8c2fe Mon Sep 17 00:00:00 2001
From: Klara Modin <klarasmodin@xxxxxxxxx>
Date: Tue, 23 Apr 2024 21:00:56 +0200
Subject: [PATCH] cgroup/cpuset: fix bitwise shift in top_cpuset initialization
Fixes: 8996f93fc388 ("cgroup/cpuset: Statically initialize more members of top_cpuset")
Signed-off-by: Klara Modin <klarasmodin@xxxxxxxxx>
---
kernel/cgroup/cpuset.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index e70008a1d86a..62d649d02f11 100644
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -369,7 +369,7 @@ static inline void notify_partition_change(struct cpuset *cs, int old_prs)
static struct cpuset top_cpuset = {
.flags = ((1 << CS_ONLINE) | (1 << CS_CPU_EXCLUSIVE) |
- (1 << CS_MEM_EXCLUSIVE) | (1 < CS_SCHED_LOAD_BALANCE)),
+ (1 << CS_MEM_EXCLUSIVE) | (1 << CS_SCHED_LOAD_BALANCE)),
.partition_root_state = PRS_ROOT,
.relax_domain_level = -1,
.remote_sibling = LIST_HEAD_INIT(top_cpuset.remote_sibling),
--
2.44.0
