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posix-cpu-timers: cleanup rlimits usage 

Fetch rlimit (both hard and soft) values only once and work on them.  It
removes many accesses through sig structure and makes the code cleaner.

Mostly a preparation for writable resource limits support.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: john stultz <johnstul@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jiri Slaby 2010-03-05 13:42:53 -08:00 committed by Linus Torvalds
parent f3abd4f953
commit d4bb527438
1 changed files with 17 additions and 15 deletions
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32
kernel/posix-cpu-timers.c
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@ -982,6 +982,7 @@ 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;
unsigned long soft;
maxfire = 20;
tsk->cputime_expires.prof_exp = cputime_zero;
@ -1030,9 +1031,9 @@ static void check_thread_timers(struct task_struct *tsk,
/*
* Check for the special case thread timers.
*/
if (sig->rlim[RLIMIT_RTTIME].rlim_cur != RLIM_INFINITY) {
soft = sig->rlim[RLIMIT_RTTIME].rlim_cur;
if (soft != RLIM_INFINITY) {
unsigned long hard = sig->rlim[RLIMIT_RTTIME].rlim_max;
unsigned long *soft = &sig->rlim[RLIMIT_RTTIME].rlim_cur;
if (hard != RLIM_INFINITY &&
tsk->rt.timeout > DIV_ROUND_UP(hard, USEC_PER_SEC/HZ)) {
@ -1043,14 +1044,13 @@ static void check_thread_timers(struct task_struct *tsk,
__group_send_sig_info(SIGKILL, SEND_SIG_PRIV, tsk);
return;
}
if (tsk->rt.timeout > DIV_ROUND_UP(*soft, USEC_PER_SEC/HZ)) {
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;
if (soft < hard) {
soft += USEC_PER_SEC;
sig->rlim[RLIMIT_RTTIME].rlim_cur = soft;
}
printk(KERN_INFO
"RT Watchdog Timeout: %s[%d]\n",
@ -1121,6 +1121,7 @@ static void check_process_timers(struct task_struct *tsk,
unsigned long long sum_sched_runtime, sched_expires;
struct list_head *timers = sig->cpu_timers;
struct task_cputime cputime;
unsigned long soft;
/*
* Don't sample the current process CPU clocks if there are no timers.
@ -1193,11 +1194,12 @@ static void check_process_timers(struct task_struct *tsk,
SIGPROF);
check_cpu_itimer(tsk, &sig->it[CPUCLOCK_VIRT], &virt_expires, utime,
SIGVTALRM);
if (sig->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY) {
soft = sig->rlim[RLIMIT_CPU].rlim_cur;
if (soft != RLIM_INFINITY) {
unsigned long psecs = cputime_to_secs(ptime);
unsigned long hard = sig->rlim[RLIMIT_CPU].rlim_max;
cputime_t x;
if (psecs >= sig->rlim[RLIMIT_CPU].rlim_max) {
if (psecs >= hard) {
/*
* At the hard limit, we just die.
* No need to calculate anything else now.
@ -1205,17 +1207,17 @@ static void check_process_timers(struct task_struct *tsk,
__group_send_sig_info(SIGKILL, SEND_SIG_PRIV, tsk);
return;
}
if (psecs >= sig->rlim[RLIMIT_CPU].rlim_cur) {
if (psecs >= soft) {
/*
* At the soft limit, send a SIGXCPU every second.
*/
__group_send_sig_info(SIGXCPU, SEND_SIG_PRIV, tsk);
if (sig->rlim[RLIMIT_CPU].rlim_cur
< sig->rlim[RLIMIT_CPU].rlim_max) {
sig->rlim[RLIMIT_CPU].rlim_cur++;
if (soft < hard) {
soft++;
sig->rlim[RLIMIT_CPU].rlim_cur = soft;
}
}
x = secs_to_cputime(sig->rlim[RLIMIT_CPU].rlim_cur);
x = secs_to_cputime(soft);
if (cputime_eq(prof_expires, cputime_zero) ||
cputime_lt(x, prof_expires)) {
prof_expires = x;