cgroup_taskset_cur_css() will be removed during the planned resturcturing of migration path. The only use of cgroup_taskset_cur_css() is finding out the old cgroup_subsys_state of the leader in cpuset_attach(). This usage can easily be removed by remembering the old value from cpuset_can_attach(). Signed-off-by: Tejun Heo <tj@xxxxxxxxxx> Cc: Li Zefan <lizefan@xxxxxxxxxx> --- kernel/cpuset.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/kernel/cpuset.c b/kernel/cpuset.c index bf20e4a..d8bec21 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -1379,6 +1379,8 @@ static int fmeter_getrate(struct fmeter *fmp) return val; } +static struct cpuset *cpuset_attach_old_cs; + /* Called by cgroups to determine if a cpuset is usable; cpuset_mutex held */ static int cpuset_can_attach(struct cgroup_subsys_state *css, struct cgroup_taskset *tset) @@ -1387,6 +1389,9 @@ static int cpuset_can_attach(struct cgroup_subsys_state *css, struct task_struct *task; int ret; + /* used later by cpuset_attach() */ + cpuset_attach_old_cs = task_cs(cgroup_taskset_first(tset)); + mutex_lock(&cpuset_mutex); /* @@ -1450,10 +1455,8 @@ static void cpuset_attach(struct cgroup_subsys_state *css, struct mm_struct *mm; struct task_struct *task; struct task_struct *leader = cgroup_taskset_first(tset); - struct cgroup_subsys_state *oldcss = cgroup_taskset_cur_css(tset, - cpuset_cgrp_id); struct cpuset *cs = css_cs(css); - struct cpuset *oldcs = css_cs(oldcss); + struct cpuset *oldcs = cpuset_attach_old_cs; struct cpuset *cpus_cs = effective_cpumask_cpuset(cs); struct cpuset *mems_cs = effective_nodemask_cpuset(cs); -- 1.8.5.3 _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/containers
