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| author | Tejun Heo <tj@kernel.org> | 2015-09-11 21:00:19 +0200 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2015-09-22 18:46:53 +0200 |
| commit | 4530eddb59494b89650d6bcd980fc7f7717ad80c (patch) | |
| tree | 0f6212afa2e7e0e4724c5f12644508f1a0baf138 /kernel/groups.c | |
| parent | cpuset: migrate memory only for threadgroup leaders (diff) | |
| download | linux-4530eddb59494b89650d6bcd980fc7f7717ad80c.tar.xz linux-4530eddb59494b89650d6bcd980fc7f7717ad80c.zip | |
cgroup, memcg, cpuset: implement cgroup_taskset_for_each_leader()
It wasn't explicitly documented but, when a process is being migrated,
cpuset and memcg depend on cgroup_taskset_first() returning the
threadgroup leader; however, this approach is somewhat ghetto and
would no longer work for the planned multi-process migration.
This patch introduces explicit cgroup_taskset_for_each_leader() which
iterates over only the threadgroup leaders and replaces
cgroup_taskset_first() usages for accessing the leader with it.
This prepares both memcg and cpuset for multi-process migration. This
patch also updates the documentation for cgroup_taskset_for_each() to
clarify the iteration rules and removes comments mentioning task
ordering in tasksets.
v2: A previous patch which added threadgroup leader test was dropped.
Patch updated accordingly.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Zefan Li <lizefan@huawei.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Diffstat (limited to 'kernel/groups.c')
0 files changed, 0 insertions, 0 deletions