Waiman Long eda17a3a70 cgroup/cpuset: Rebind/migrate mm only for threadgroup leader in cpuset_update_tasks_nodemask() ... As reported by sashiko [1], cpuset_update_tasks_nodemask() will do mpol_rebind_mm() and possibly cpuset_migrate_mm() for all threads of a multithreaded process. Since commit 3df9ca0a2b ("cpuset: migrate memory only for threadgroup leaders"), cpuset_attach() had been updated to rebind and migrate memory only for threadgroup leaders to mark the group leader as the owner of the mm_struct. To be consistent and avoid unnecessary performance overhead for heavily multithreaded processes, follow the cpuset_attach() example and perform memory rebind and migration only for threadgroup leaders. Also add a paragraph in cgroup-v2.rst under cpuset.mems that the threadgroup leader is the memory owner of that threadgroup. Therefore the non-leading threads shouldn't be in other cgroups whose "cpuset.mems" doesn't fully overlap that of the group leader. [1] https://sashiko.dev/#/patchset/20260621032816.1806773-1-longman%40redhat.com Signed-off-by: Waiman Long <longman@redhat.com> Reviewed-by: Ridong Chen <ridong.chen@linux.dev> Signed-off-by: Tejun Heo <tj@kernel.org>		2026-06-24 09:42:04 -10:00
..
cgroup-internal.h	cgroup: Expose some cgroup helpers	2026-03-05 18:15:58 -10:00
cgroup-v1.c	Convert 'alloc_obj' family to use the new default GFP_KERNEL argument	2026-02-21 17:09:51 -08:00
cgroup.c	cgroup: Changes for v7.2	2026-06-17 12:03:56 +01:00
cpuset-internal.h	cgroup/cpuset: Reserve DL bandwidth only for root-domain moves	2026-05-11 10:27:14 -10:00
cpuset-v1.c	cgroup: Inline cgroup_has_tasks() in cgroup.h	2026-05-15 07:24:12 -10:00
cpuset.c	cgroup/cpuset: Rebind/migrate mm only for threadgroup leader in cpuset_update_tasks_nodemask()	2026-06-24 09:42:04 -10:00
debug.c	Convert 'alloc_obj' family to use the new default GFP_KERNEL argument	2026-02-21 17:09:51 -08:00
dmem.c	cgroup/dmem: Return -ENOMEM on failed pool preallocation	2026-05-10 15:43:46 -10:00
freezer.c	cgroup: cgroup.stat.local time accounting	2025-08-22 07:50:43 -10:00
legacy_freezer.c	Convert 'alloc_obj' family to use the new default GFP_KERNEL argument	2026-02-21 17:09:51 -08:00
Makefile	kernel/cgroup: Add "dmem" memory accounting cgroup	2025-01-06 17:24:38 +01:00
misc.c	Convert 'alloc_obj' family to use the new default GFP_KERNEL argument	2026-02-21 17:09:51 -08:00
namespace.c	treewide: Replace kmalloc with kmalloc_obj for non-scalar types	2026-02-21 01:02:28 -08:00
pids.c	Convert 'alloc_obj' family to use the new default GFP_KERNEL argument	2026-02-21 17:09:51 -08:00
rdma.c	cgroup/rdma: Drop unnecessary READ_ONCE() on event counters	2026-05-18 09:24:50 -10:00
rstat.c	cgroup: rstat: relax NMI guard after switch to try_cmpxchg	2026-05-20 09:44:35 -10:00