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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 03:30:52 +07:00
timers: Omit POSIX timer stuff from task_struct when disabled
When CONFIG_POSIX_TIMERS is disabled, it is preferable to remove related structures from struct task_struct and struct signal_struct as they won't contain anything useful and shouldn't be relied upon by mistake. Code still referencing those structures is also disabled here. Signed-off-by: Nicolas Pitre <nico@linaro.org> Signed-off-by: John Stultz <john.stultz@linaro.org>
This commit is contained in:
Nicolas Pitre
John Stultz
parent
9f8197980d
commit
b18b6a9cef
@ -2179,7 +2179,7 @@ static const struct file_operations proc_map_files_operations = {
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.llseek = generic_file_llseek,
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};
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#ifdef CONFIG_CHECKPOINT_RESTORE
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#if defined(CONFIG_CHECKPOINT_RESTORE) && defined(CONFIG_POSIX_TIMERS)
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struct timers_private {
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struct pid *pid;
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struct task_struct *task;
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@ -2936,7 +2936,7 @@ static const struct pid_entry tgid_base_stuff[] = {
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REG("projid_map", S_IRUGO|S_IWUSR, proc_projid_map_operations),
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REG("setgroups", S_IRUGO|S_IWUSR, proc_setgroups_operations),
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#endif
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#ifdef CONFIG_CHECKPOINT_RESTORE
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#if defined(CONFIG_CHECKPOINT_RESTORE) && defined(CONFIG_POSIX_TIMERS)
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REG("timers", S_IRUGO, proc_timers_operations),
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#endif
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REG("timerslack_ns", S_IRUGO|S_IWUGO, proc_pid_set_timerslack_ns_operations),
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@ -42,6 +42,27 @@ extern struct fs_struct init_fs;
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#define INIT_PREV_CPUTIME(x)
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#endif
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#ifdef CONFIG_POSIX_TIMERS
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#define INIT_POSIX_TIMERS(s) \
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.posix_timers = LIST_HEAD_INIT(s.posix_timers),
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#define INIT_CPU_TIMERS(s) \
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.cpu_timers = { \
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LIST_HEAD_INIT(s.cpu_timers[0]), \
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LIST_HEAD_INIT(s.cpu_timers[1]), \
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LIST_HEAD_INIT(s.cpu_timers[2]), \
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},
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#define INIT_CPUTIMER(s) \
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.cputimer = { \
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.cputime_atomic = INIT_CPUTIME_ATOMIC, \
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.running = false, \
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.checking_timer = false, \
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},
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#else
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#define INIT_POSIX_TIMERS(s)
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#define INIT_CPU_TIMERS(s)
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#define INIT_CPUTIMER(s)
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#endif
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#define INIT_SIGNALS(sig) { \
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.nr_threads = 1, \
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.thread_head = LIST_HEAD_INIT(init_task.thread_node), \
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@ -49,14 +70,10 @@ extern struct fs_struct init_fs;
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.shared_pending = { \
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.list = LIST_HEAD_INIT(sig.shared_pending.list), \
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.signal = {{0}}}, \
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.posix_timers = LIST_HEAD_INIT(sig.posix_timers), \
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.cpu_timers = INIT_CPU_TIMERS(sig.cpu_timers), \
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INIT_POSIX_TIMERS(sig) \
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INIT_CPU_TIMERS(sig) \
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.rlim = INIT_RLIMITS, \
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.cputimer = { \
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.cputime_atomic = INIT_CPUTIME_ATOMIC, \
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.running = false, \
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.checking_timer = false, \
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}, \
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INIT_CPUTIMER(sig) \
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INIT_PREV_CPUTIME(sig) \
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.cred_guard_mutex = \
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__MUTEX_INITIALIZER(sig.cred_guard_mutex), \
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@ -247,7 +264,7 @@ extern struct task_group root_task_group;
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.blocked = {{0}}, \
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.alloc_lock = __SPIN_LOCK_UNLOCKED(tsk.alloc_lock), \
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.journal_info = NULL, \
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.cpu_timers = INIT_CPU_TIMERS(tsk.cpu_timers), \
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INIT_CPU_TIMERS(tsk) \
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.pi_lock = __RAW_SPIN_LOCK_UNLOCKED(tsk.pi_lock), \
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.timer_slack_ns = 50000, /* 50 usec default slack */ \
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.pids = { \
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@ -274,13 +291,6 @@ extern struct task_group root_task_group;
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}
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#define INIT_CPU_TIMERS(cpu_timers) \
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{ \
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LIST_HEAD_INIT(cpu_timers[0]), \
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LIST_HEAD_INIT(cpu_timers[1]), \
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LIST_HEAD_INIT(cpu_timers[2]), \
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}
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/* Attach to the init_task data structure for proper alignment */
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#define __init_task_data __attribute__((__section__(".data..init_task")))
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@ -734,13 +734,14 @@ struct signal_struct {
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unsigned int is_child_subreaper:1;
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unsigned int has_child_subreaper:1;
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#ifdef CONFIG_POSIX_TIMERS
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/* POSIX.1b Interval Timers */
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int posix_timer_id;
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struct list_head posix_timers;
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/* ITIMER_REAL timer for the process */
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struct hrtimer real_timer;
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struct pid *leader_pid;
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ktime_t it_real_incr;
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/*
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@ -759,12 +760,16 @@ struct signal_struct {
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/* Earliest-expiration cache. */
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struct task_cputime cputime_expires;
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struct list_head cpu_timers[3];
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#endif
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struct pid *leader_pid;
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#ifdef CONFIG_NO_HZ_FULL
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atomic_t tick_dep_mask;
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#endif
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struct list_head cpu_timers[3];
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struct pid *tty_old_pgrp;
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/* boolean value for session group leader */
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@ -1681,8 +1686,10 @@ struct task_struct {
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/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
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unsigned long min_flt, maj_flt;
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#ifdef CONFIG_POSIX_TIMERS
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struct task_cputime cputime_expires;
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struct list_head cpu_timers[3];
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#endif
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/* process credentials */
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const struct cred __rcu *ptracer_cred; /* Tracer's credentials at attach */
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@ -1304,6 +1304,7 @@ void __cleanup_sighand(struct sighand_struct *sighand)
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}
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}
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#ifdef CONFIG_POSIX_TIMERS
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/*
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* Initialize POSIX timer handling for a thread group.
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*/
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@ -1322,6 +1323,9 @@ static void posix_cpu_timers_init_group(struct signal_struct *sig)
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INIT_LIST_HEAD(&sig->cpu_timers[1]);
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INIT_LIST_HEAD(&sig->cpu_timers[2]);
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}
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#else
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static inline void posix_cpu_timers_init_group(struct signal_struct *sig) { }
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#endif
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static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
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{
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@ -1346,11 +1350,11 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
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init_waitqueue_head(&sig->wait_chldexit);
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sig->curr_target = tsk;
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init_sigpending(&sig->shared_pending);
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INIT_LIST_HEAD(&sig->posix_timers);
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seqlock_init(&sig->stats_lock);
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prev_cputime_init(&sig->prev_cputime);
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#ifdef CONFIG_POSIX_TIMERS
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INIT_LIST_HEAD(&sig->posix_timers);
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hrtimer_init(&sig->real_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
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sig->real_timer.function = it_real_fn;
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#endif
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@ -1425,6 +1429,7 @@ static void rt_mutex_init_task(struct task_struct *p)
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#endif
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}
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#ifdef CONFIG_POSIX_TIMERS
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/*
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* Initialize POSIX timer handling for a single task.
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*/
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@ -1437,6 +1442,9 @@ static void posix_cpu_timers_init(struct task_struct *tsk)
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INIT_LIST_HEAD(&tsk->cpu_timers[1]);
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INIT_LIST_HEAD(&tsk->cpu_timers[2]);
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}
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#else
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static inline void posix_cpu_timers_init(struct task_struct *tsk) { }
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#endif
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static inline void
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init_task_pid(struct task_struct *task, enum pid_type type, struct pid *pid)
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@ -2246,6 +2246,7 @@ prio_changed_rt(struct rq *rq, struct task_struct *p, int oldprio)
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}
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}
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#ifdef CONFIG_POSIX_TIMERS
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static void watchdog(struct rq *rq, struct task_struct *p)
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{
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unsigned long soft, hard;
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@ -2267,6 +2268,9 @@ static void watchdog(struct rq *rq, struct task_struct *p)
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p->cputime_expires.sched_exp = p->se.sum_exec_runtime;
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}
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}
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#else
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static inline void watchdog(struct rq *rq, struct task_struct *p) { }
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#endif
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static void task_tick_rt(struct rq *rq, struct task_struct *p, int queued)
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{
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@ -172,18 +172,19 @@ sched_info_switch(struct rq *rq,
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*/
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/**
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* cputimer_running - return true if cputimer is running
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* get_running_cputimer - return &tsk->signal->cputimer if cputimer is running
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*
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* @tsk: Pointer to target task.
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*/
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static inline bool cputimer_running(struct task_struct *tsk)
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#ifdef CONFIG_POSIX_TIMERS
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static inline
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struct thread_group_cputimer *get_running_cputimer(struct task_struct *tsk)
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{
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struct thread_group_cputimer *cputimer = &tsk->signal->cputimer;
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/* Check if cputimer isn't running. This is accessed without locking. */
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if (!READ_ONCE(cputimer->running))
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return false;
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return NULL;
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/*
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* After we flush the task's sum_exec_runtime to sig->sum_sched_runtime
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@ -200,10 +201,17 @@ static inline bool cputimer_running(struct task_struct *tsk)
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* clock delta is behind the expiring timer value.
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*/
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if (unlikely(!tsk->sighand))
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return false;
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return NULL;
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return true;
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return cputimer;
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}
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#else
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static inline
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struct thread_group_cputimer *get_running_cputimer(struct task_struct *tsk)
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{
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return NULL;
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}
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#endif
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/**
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* account_group_user_time - Maintain utime for a thread group.
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@ -218,9 +226,9 @@ static inline bool cputimer_running(struct task_struct *tsk)
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static inline void account_group_user_time(struct task_struct *tsk,
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cputime_t cputime)
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{
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struct thread_group_cputimer *cputimer = &tsk->signal->cputimer;
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struct thread_group_cputimer *cputimer = get_running_cputimer(tsk);
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if (!cputimer_running(tsk))
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if (!cputimer)
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return;
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atomic64_add(cputime, &cputimer->cputime_atomic.utime);
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@ -239,9 +247,9 @@ static inline void account_group_user_time(struct task_struct *tsk,
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static inline void account_group_system_time(struct task_struct *tsk,
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cputime_t cputime)
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{
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struct thread_group_cputimer *cputimer = &tsk->signal->cputimer;
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struct thread_group_cputimer *cputimer = get_running_cputimer(tsk);
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if (!cputimer_running(tsk))
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if (!cputimer)
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return;
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atomic64_add(cputime, &cputimer->cputime_atomic.stime);
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@ -260,9 +268,9 @@ static inline void account_group_system_time(struct task_struct *tsk,
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static inline void account_group_exec_runtime(struct task_struct *tsk,
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unsigned long long ns)
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{
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struct thread_group_cputimer *cputimer = &tsk->signal->cputimer;
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struct thread_group_cputimer *cputimer = get_running_cputimer(tsk);
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if (!cputimer_running(tsk))
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if (!cputimer)
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return;
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atomic64_add(ns, &cputimer->cputime_atomic.sum_exec_runtime);
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