diff options
| -rw-r--r-- | Documentation/cgroups/unified-hierarchy.txt | 4 | ||||
| -rw-r--r-- | include/linux/cgroup-defs.h | 4 | ||||
| -rw-r--r-- | include/linux/cgroup.h | 2 | ||||
| -rw-r--r-- | kernel/cgroup.c | 51 | ||||
| -rw-r--r-- | kernel/cgroup_pids.c | 6 | ||||
| -rw-r--r-- | kernel/events/core.c | 16 | ||||
| -rw-r--r-- | kernel/fork.c | 1 | ||||
| -rw-r--r-- | kernel/sched/core.c | 16 |
8 files changed, 44 insertions, 56 deletions
diff --git a/Documentation/cgroups/unified-hierarchy.txt b/Documentation/cgroups/unified-hierarchy.txt index 176b940f8327..6932453d37a2 100644 --- a/Documentation/cgroups/unified-hierarchy.txt +++ b/Documentation/cgroups/unified-hierarchy.txt @@ -374,6 +374,10 @@ supported and the interface files "release_agent" and - The "cgroup.clone_children" file is removed. +- /proc/PID/cgroup keeps reporting the cgroup that a zombie belonged + to before exiting. If the cgroup is removed before the zombie is + reaped, " (deleted)" is appeneded to the path. + 5-3. Controller File Conventions diff --git a/include/linux/cgroup-defs.h b/include/linux/cgroup-defs.h index 62413c3e2f4b..6a1ab64ee5f9 100644 --- a/include/linux/cgroup-defs.h +++ b/include/linux/cgroup-defs.h @@ -435,9 +435,7 @@ struct cgroup_subsys { int (*can_fork)(struct task_struct *task, void **priv_p); void (*cancel_fork)(struct task_struct *task, void *priv); void (*fork)(struct task_struct *task, void *priv); - void (*exit)(struct cgroup_subsys_state *css, - struct cgroup_subsys_state *old_css, - struct task_struct *task); + void (*exit)(struct task_struct *task); void (*bind)(struct cgroup_subsys_state *root_css); int early_init; diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index 46020735bcbb..22e3754f89c5 100644 --- a/include/linux/cgroup.h +++ b/include/linux/cgroup.h @@ -102,6 +102,7 @@ extern void cgroup_cancel_fork(struct task_struct *p, extern void cgroup_post_fork(struct task_struct *p, void *old_ss_priv[CGROUP_CANFORK_COUNT]); void cgroup_exit(struct task_struct *p); +void cgroup_free(struct task_struct *p); int cgroup_init_early(void); int cgroup_init(void); @@ -547,6 +548,7 @@ static inline void cgroup_cancel_fork(struct task_struct *p, static inline void cgroup_post_fork(struct task_struct *p, void *ss_priv[CGROUP_CANFORK_COUNT]) {} static inline void cgroup_exit(struct task_struct *p) {} +static inline void cgroup_free(struct task_struct *p) {} static inline int cgroup_init_early(void) { return 0; } static inline int cgroup_init(void) { return 0; } diff --git a/kernel/cgroup.c b/kernel/cgroup.c index ba7b3284c2e4..918658497625 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -5379,14 +5379,34 @@ int proc_cgroup_show(struct seq_file *m, struct pid_namespace *ns, seq_printf(m, "%sname=%s", count ? "," : "", root->name); seq_putc(m, ':'); + cgrp = task_cgroup_from_root(tsk, root); - path = cgroup_path(cgrp, buf, PATH_MAX); - if (!path) { - retval = -ENAMETOOLONG; - goto out_unlock; + + /* + * On traditional hierarchies, all zombie tasks show up as + * belonging to the root cgroup. On the default hierarchy, + * while a zombie doesn't show up in "cgroup.procs" and + * thus can't be migrated, its /proc/PID/cgroup keeps + * reporting the cgroup it belonged to before exiting. If + * the cgroup is removed before the zombie is reaped, + * " (deleted)" is appended to the cgroup path. + */ + if (cgroup_on_dfl(cgrp) || !(tsk->flags & PF_EXITING)) { + path = cgroup_path(cgrp, buf, PATH_MAX); + if (!path) { + retval = -ENAMETOOLONG; + goto out_unlock; + } + } else { + path = "/"; } + seq_puts(m, path); - seq_putc(m, '\n'); + + if (cgroup_on_dfl(cgrp) && cgroup_is_dead(cgrp)) + seq_puts(m, " (deleted)\n"); + else + seq_putc(m, '\n'); } retval = 0; @@ -5593,7 +5613,6 @@ void cgroup_exit(struct task_struct *tsk) { struct cgroup_subsys *ss; struct css_set *cset; - bool put_cset = false; int i; /* @@ -5606,22 +5625,20 @@ void cgroup_exit(struct task_struct *tsk) spin_lock_bh(&css_set_lock); css_set_move_task(tsk, cset, NULL, false); spin_unlock_bh(&css_set_lock); - put_cset = true; + } else { + get_css_set(cset); } - /* Reassign the task to the init_css_set. */ - RCU_INIT_POINTER(tsk->cgroups, &init_css_set); - /* see cgroup_post_fork() for details */ - for_each_subsys_which(ss, i, &have_exit_callback) { - struct cgroup_subsys_state *old_css = cset->subsys[i]; - struct cgroup_subsys_state *css = task_css(tsk, i); + for_each_subsys_which(ss, i, &have_exit_callback) + ss->exit(tsk); +} - ss->exit(css, old_css, tsk); - } +void cgroup_free(struct task_struct *task) +{ + struct css_set *cset = task_css_set(task); - if (put_cset) - put_css_set(cset); + put_css_set(cset); } static void check_for_release(struct cgroup *cgrp) diff --git a/kernel/cgroup_pids.c b/kernel/cgroup_pids.c index 806cd7693ac8..45f0856a61fe 100644 --- a/kernel/cgroup_pids.c +++ b/kernel/cgroup_pids.c @@ -266,11 +266,9 @@ static void pids_fork(struct task_struct *task, void *priv) css_put(old_css); } -static void pids_exit(struct cgroup_subsys_state *css, - struct cgroup_subsys_state *old_css, - struct task_struct *task) +static void pids_exit(struct task_struct *task) { - struct pids_cgroup *pids = css_pids(old_css); + struct pids_cgroup *pids = css_pids(task_css(task, pids_cgrp_id)); pids_uncharge(pids, 1); } diff --git a/kernel/events/core.c b/kernel/events/core.c index f548f69c4299..e9874949c787 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -9293,25 +9293,9 @@ static void perf_cgroup_attach(struct cgroup_subsys_state *css, task_function_call(task, __perf_cgroup_move, task); } -static void perf_cgroup_exit(struct cgroup_subsys_state *css, - struct cgroup_subsys_state *old_css, - struct task_struct *task) -{ - /* - * cgroup_exit() is called in the copy_process() failure path. - * Ignore this case since the task hasn't ran yet, this avoids - * trying to poke a half freed task state from generic code. - */ - if (!(task->flags & PF_EXITING)) - return; - - task_function_call(task, __perf_cgroup_move, task); -} - struct cgroup_subsys perf_event_cgrp_subsys = { .css_alloc = perf_cgroup_css_alloc, .css_free = perf_cgroup_css_free, - .exit = perf_cgroup_exit, .attach = perf_cgroup_attach, }; #endif /* CONFIG_CGROUP_PERF */ diff --git a/kernel/fork.c b/kernel/fork.c index 7d5f0f118a63..118743bb5964 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -251,6 +251,7 @@ void __put_task_struct(struct task_struct *tsk) WARN_ON(atomic_read(&tsk->usage)); WARN_ON(tsk == current); + cgroup_free(tsk); task_numa_free(tsk); security_task_free(tsk); exit_creds(tsk); diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 3595403921bd..2cad9ba91036 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -8163,21 +8163,6 @@ static void cpu_cgroup_attach(struct cgroup_subsys_state *css, sched_move_task(task); } -static void cpu_cgroup_exit(struct cgroup_subsys_state *css, - struct cgroup_subsys_state *old_css, - struct task_struct *task) -{ - /* - * cgroup_exit() is called in the copy_process() failure path. - * Ignore this case since the task hasn't ran yet, this avoids - * trying to poke a half freed task state from generic code. - */ - if (!(task->flags & PF_EXITING)) - return; - - sched_move_task(task); -} - #ifdef CONFIG_FAIR_GROUP_SCHED static int cpu_shares_write_u64(struct cgroup_subsys_state *css, struct cftype *cftype, u64 shareval) @@ -8509,7 +8494,6 @@ struct cgroup_subsys cpu_cgrp_subsys = { .fork = cpu_cgroup_fork, .can_attach = cpu_cgroup_can_attach, .attach = cpu_cgroup_attach, - .exit = cpu_cgroup_exit, .legacy_cftypes = cpu_files, .early_init = 1, }; |