diff options
| -rw-r--r-- | include/asm-generic/resource.h | 5 | ||||
| -rw-r--r-- | include/linux/sched.h | 1 | ||||
| -rw-r--r-- | kernel/posix-cpu-timers.c | 29 | ||||
| -rw-r--r-- | kernel/sched_rt.c | 30 |
4 files changed, 63 insertions, 2 deletions
diff --git a/include/asm-generic/resource.h b/include/asm-generic/resource.h index a4a22cc35898..587566f95f6c 100644 --- a/include/asm-generic/resource.h +++ b/include/asm-generic/resource.h @@ -44,8 +44,8 @@ #define RLIMIT_NICE 13 /* max nice prio allowed to raise to 0-39 for nice level 19 .. -20 */ #define RLIMIT_RTPRIO 14 /* maximum realtime priority */ - -#define RLIM_NLIMITS 15 +#define RLIMIT_RTTIME 15 /* timeout for RT tasks in us */ +#define RLIM_NLIMITS 16 /* * SuS says limits have to be unsigned. @@ -86,6 +86,7 @@ [RLIMIT_MSGQUEUE] = { MQ_BYTES_MAX, MQ_BYTES_MAX }, \ [RLIMIT_NICE] = { 0, 0 }, \ [RLIMIT_RTPRIO] = { 0, 0 }, \ + [RLIMIT_RTTIME] = { RLIM_INFINITY, RLIM_INFINITY }, \ } #endif /* __KERNEL__ */ diff --git a/include/linux/sched.h b/include/linux/sched.h index a06d09ebd5c6..fe3f8fbc614e 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -932,6 +932,7 @@ struct sched_entity { struct sched_rt_entity { struct list_head run_list; unsigned int time_slice; + unsigned long timeout; }; struct task_struct { diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c index 68c96376e84a..2c076b36c4f6 100644 --- a/kernel/posix-cpu-timers.c +++ b/kernel/posix-cpu-timers.c @@ -967,6 +967,7 @@ static void check_thread_timers(struct task_struct *tsk, { int maxfire; struct list_head *timers = tsk->cpu_timers; + struct signal_struct *const sig = tsk->signal; maxfire = 20; tsk->it_prof_expires = cputime_zero; @@ -1011,6 +1012,34 @@ static void check_thread_timers(struct task_struct *tsk, t->firing = 1; list_move_tail(&t->entry, firing); } + + /* + * Check for the special case thread timers. + */ + if (sig->rlim[RLIMIT_RTTIME].rlim_cur != RLIM_INFINITY) { + unsigned long hard = sig->rlim[RLIMIT_RTTIME].rlim_max; + unsigned long *soft = &sig->rlim[RLIMIT_RTTIME].rlim_cur; + + if (tsk->rt.timeout > DIV_ROUND_UP(hard, USEC_PER_SEC/HZ)) { + /* + * At the hard limit, we just die. + * No need to calculate anything else now. + */ + __group_send_sig_info(SIGKILL, SEND_SIG_PRIV, tsk); + return; + } + if (tsk->rt.timeout > DIV_ROUND_UP(*soft, USEC_PER_SEC/HZ)) { + /* + * At the soft limit, send a SIGXCPU every second. + */ + if (sig->rlim[RLIMIT_RTTIME].rlim_cur + < sig->rlim[RLIMIT_RTTIME].rlim_max) { + sig->rlim[RLIMIT_RTTIME].rlim_cur += + USEC_PER_SEC; + } + __group_send_sig_info(SIGXCPU, SEND_SIG_PRIV, tsk); + } + } } /* diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c index 29963af782ae..f350f7b15158 100644 --- a/kernel/sched_rt.c +++ b/kernel/sched_rt.c @@ -116,6 +116,9 @@ static void enqueue_task_rt(struct rq *rq, struct task_struct *p, int wakeup) inc_cpu_load(rq, p->se.load.weight); inc_rt_tasks(p, rq); + + if (wakeup) + p->rt.timeout = 0; } /* @@ -834,11 +837,38 @@ static void prio_changed_rt(struct rq *rq, struct task_struct *p, } } +static void watchdog(struct rq *rq, struct task_struct *p) +{ + unsigned long soft, hard; + + if (!p->signal) + return; + + soft = p->signal->rlim[RLIMIT_RTTIME].rlim_cur; + hard = p->signal->rlim[RLIMIT_RTTIME].rlim_max; + + if (soft != RLIM_INFINITY) { + unsigned long next; + + p->rt.timeout++; + next = DIV_ROUND_UP(min(soft, hard), USEC_PER_SEC/HZ); + if (next > p->rt.timeout) { + u64 next_time = p->se.sum_exec_runtime; + + next_time += next * (NSEC_PER_SEC/HZ); + if (p->it_sched_expires > next_time) + p->it_sched_expires = next_time; + } else + p->it_sched_expires = p->se.sum_exec_runtime; + } +} static void task_tick_rt(struct rq *rq, struct task_struct *p) { update_curr_rt(rq); + watchdog(rq, p); + /* * RR tasks need a special form of timeslice management. * FIFO tasks have no timeslices. |