Waiman Long ccac8e8de9 cgroup/cpuset: Fix remote root partition creation problem ... Since commit 181c8e091a ("cgroup/cpuset: Introduce remote partition"), a remote partition can be created underneath a non-partition root cpuset as long as its exclusive_cpus are set to distribute exclusive CPUs down to its children. The generate_sched_domains() function, however, doesn't take into account this new behavior and hence will fail to create the sched domain needed for a remote root (non-isolated) partition. There are two issues related to remote partition support. First of all, generate_sched_domains() has a fast path that is activated if root_load_balance is true and top_cpuset.nr_subparts is non-zero. The later condition isn't quite correct for remote partitions as nr_subparts just shows the number of local child partitions underneath it. There can be no local child partition under top_cpuset even if there are remote partitions further down the hierarchy. Fix that by checking for subpartitions_cpus which contains exclusive CPUs allocated to both local and remote partitions. Secondly, the valid partition check for subtree skipping in the csa[] generation loop isn't enough as remote partition does not need to have a partition root parent. Fix this problem by breaking csa[] array generation loop of generate_sched_domains() into v1 and v2 specific parts and checking a cpuset's exclusive_cpus before skipping its subtree in the v2 case. Also simplify generate_sched_domains() for cgroup v2 as only non-isolating partition roots should be included in building the cpuset array and none of the v1 scheduling attributes other than a different way to create an isolated partition are supported. Fixes: 181c8e091a ("cgroup/cpuset: Introduce remote partition") Signed-off-by: Waiman Long <longman@redhat.com> Signed-off-by: Tejun Heo <tj@kernel.org>		2024-06-19 07:37:37 -10:00
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cgroup-internal.h	cgroup: Add a new helper for cgroup1 hierarchy	2023-11-09 13:25:47 -10:00
cgroup-v1.c	cgroup: Avoid unnecessary looping in cgroup_no_v1()	2024-04-19 05:43:36 -10:00
cgroup.c	cgroup: avoid the unnecessary list_add(dying_tasks) in cgroup_exit()	2024-06-19 07:18:41 -10:00
cpuset.c	cgroup/cpuset: Fix remote root partition creation problem	2024-06-19 07:37:37 -10:00
debug.c	kernel: cgroup: fix misuse of %x	2019-05-06 08:47:48 -07:00
freezer.c	cgroup: cleanup comments	2022-03-13 19:19:27 -10:00
legacy_freezer.c	cgroup, legacy_freezer: update comment for freezer_css_offline()	2024-04-18 06:01:50 -10:00
Makefile	cgroup: Add misc cgroup controller	2021-04-04 13:34:46 -04:00
misc.c	cgroup/misc: Store atomic64_t reads to u64	2023-07-21 08:10:06 -10:00
namespace.c	cgroup:namespace: Remove unused cgroup_namespaces_init()	2023-08-14 14:29:47 -10:00
pids.c	cgroup/pids: Add pids.events.local	2024-05-26 08:45:10 -10:00
rdma.c	rdmacg: fix kernel-doc warnings in rdmacg	2023-06-05 09:45:14 -10:00
rstat.c	cgroup/rstat: add cgroup_rstat_cpu_lock helpers and tracepoints	2024-05-14 09:43:17 -10:00