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Message-ID: <20090402141146.0ede3c2a@dhcp-lab-109.englab.brq.redhat.com>
Date: Thu, 2 Apr 2009 14:11:46 +0200
From: Stanislaw Gruszka <sgruszka@...hat.com>
To: linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] itimers: merge ITIMER_VIRT and ITIMER_PROF common code
Both cpu itimers have same data flow in the few places, this patch make
unification of code related with VIRT and PROF itimers.
Signed-off-by: Stanislaw Gruszka <sgruszka@...hat.com>
---
include/linux/sched.h | 6 +-
kernel/fork.c | 8 +-
kernel/itimer.c | 136 +++++++++++++++++++--------------------------
kernel/posix-cpu-timers.c | 81 ++++++++++++++-------------
4 files changed, 107 insertions(+), 124 deletions(-)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 29df637..b4c19c2 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -440,6 +440,8 @@ struct pacct_struct {
unsigned long ac_minflt, ac_majflt;
};
+enum itimer_number {IT_VIRT = 0, IT_PROF = 1};
+
/**
* struct task_cputime - collected CPU time counts
* @utime: time spent in user mode, in &cputime_t units
@@ -526,8 +528,8 @@ struct signal_struct {
ktime_t it_real_incr;
/* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
- cputime_t it_prof_expires, it_virt_expires;
- cputime_t it_prof_incr, it_virt_incr;
+ cputime_t it_expires[2];
+ cputime_t it_incr[2];
/*
* Thread group totals for process CPU timers.
diff --git a/kernel/fork.c b/kernel/fork.c
index 47c1584..6c7044a 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -803,10 +803,10 @@ static void posix_cpu_timers_init_group(struct signal_struct *sig)
thread_group_cputime_init(sig);
/* Expiration times and increments. */
- sig->it_virt_expires = cputime_zero;
- sig->it_virt_incr = cputime_zero;
- sig->it_prof_expires = cputime_zero;
- sig->it_prof_incr = cputime_zero;
+ sig->it_expires[IT_VIRT] = cputime_zero;
+ sig->it_expires[IT_PROF] = cputime_zero;
+ sig->it_incr[IT_VIRT] = cputime_zero;
+ sig->it_incr[IT_PROF] = cputime_zero;
/* Cached expiration times. */
sig->cputime_expires.prof_exp = cputime_zero;
diff --git a/kernel/itimer.c b/kernel/itimer.c
index 58762f7..ec64fea 100644
--- a/kernel/itimer.c
+++ b/kernel/itimer.c
@@ -41,10 +41,34 @@ static struct timeval itimer_get_remtime(struct hrtimer *timer)
return ktime_to_timeval(rem);
}
+static void get_cpu_itimer(struct task_struct *tsk, enum itimer_number i,
+ struct itimerval *value)
+{
+ cputime_t cval, cinterval;
+
+ spin_lock_irq(&tsk->sighand->siglock);
+ cval = tsk->signal->it_expires[i];
+ cinterval = tsk->signal->it_incr[i];
+ if (!cputime_eq(cval, cputime_zero)) {
+ struct task_cputime cputime;
+ cputime_t utime;
+
+ thread_group_cputimer(tsk, &cputime);
+ utime = cputime.utime;
+ if (cputime_le(cval, utime)) { /* about to fire */
+ cval = jiffies_to_cputime(1);
+ } else {
+ cval = cputime_sub(cval, utime);
+ }
+ }
+ spin_unlock_irq(&tsk->sighand->siglock);
+ cputime_to_timeval(cval, &value->it_value);
+ cputime_to_timeval(cinterval, &value->it_interval);
+}
+
int do_getitimer(int which, struct itimerval *value)
{
struct task_struct *tsk = current;
- cputime_t cinterval, cval;
switch (which) {
case ITIMER_REAL:
@@ -55,44 +79,10 @@ int do_getitimer(int which, struct itimerval *value)
spin_unlock_irq(&tsk->sighand->siglock);
break;
case ITIMER_VIRTUAL:
- spin_lock_irq(&tsk->sighand->siglock);
- cval = tsk->signal->it_virt_expires;
- cinterval = tsk->signal->it_virt_incr;
- if (!cputime_eq(cval, cputime_zero)) {
- struct task_cputime cputime;
- cputime_t utime;
-
- thread_group_cputimer(tsk, &cputime);
- utime = cputime.utime;
- if (cputime_le(cval, utime)) { /* about to fire */
- cval = jiffies_to_cputime(1);
- } else {
- cval = cputime_sub(cval, utime);
- }
- }
- spin_unlock_irq(&tsk->sighand->siglock);
- cputime_to_timeval(cval, &value->it_value);
- cputime_to_timeval(cinterval, &value->it_interval);
+ get_cpu_itimer(tsk, IT_VIRT, value);
break;
case ITIMER_PROF:
- spin_lock_irq(&tsk->sighand->siglock);
- cval = tsk->signal->it_prof_expires;
- cinterval = tsk->signal->it_prof_incr;
- if (!cputime_eq(cval, cputime_zero)) {
- struct task_cputime times;
- cputime_t ptime;
-
- thread_group_cputimer(tsk, ×);
- ptime = cputime_add(times.utime, times.stime);
- if (cputime_le(cval, ptime)) { /* about to fire */
- cval = jiffies_to_cputime(1);
- } else {
- cval = cputime_sub(cval, ptime);
- }
- }
- spin_unlock_irq(&tsk->sighand->siglock);
- cputime_to_timeval(cval, &value->it_value);
- cputime_to_timeval(cinterval, &value->it_interval);
+ get_cpu_itimer(tsk, IT_PROF, value);
break;
default:
return(-EINVAL);
@@ -128,6 +118,35 @@ enum hrtimer_restart it_real_fn(struct hrtimer *timer)
return HRTIMER_NORESTART;
}
+static void set_cpu_itimer(struct task_struct *tsk, enum itimer_number i,
+ struct itimerval *value, struct itimerval *ovalue)
+{
+ cputime_t cval, cinterval, nval, ninterval;
+
+ nval = timeval_to_cputime(&value->it_value);
+ ninterval = timeval_to_cputime(&value->it_interval);
+
+ spin_lock_irq(&tsk->sighand->siglock);
+
+ cval = tsk->signal->it_expires[i];
+ cinterval = tsk->signal->it_incr[i];
+ if (!cputime_eq(cval, cputime_zero) ||
+ !cputime_eq(nval, cputime_zero)) {
+ if (cputime_gt(nval, cputime_zero))
+ nval = cputime_add(nval, jiffies_to_cputime(1));
+ set_process_cpu_timer(tsk, i, &nval, &cval);
+ }
+ tsk->signal->it_expires[i] = nval;
+ tsk->signal->it_incr[i] = ninterval;
+
+ spin_unlock_irq(&tsk->sighand->siglock);
+
+ if (ovalue) {
+ cputime_to_timeval(cval, &ovalue->it_value);
+ cputime_to_timeval(cinterval, &ovalue->it_interval);
+ }
+}
+
/*
* Returns true if the timeval is in canonical form
*/
@@ -139,7 +158,6 @@ int do_setitimer(int which, struct itimerval *value, struct itimerval *ovalue)
struct task_struct *tsk = current;
struct hrtimer *timer;
ktime_t expires;
- cputime_t cval, cinterval, nval, ninterval;
/*
* Validate the timevals in value.
@@ -174,48 +192,10 @@ again:
spin_unlock_irq(&tsk->sighand->siglock);
break;
case ITIMER_VIRTUAL:
- nval = timeval_to_cputime(&value->it_value);
- ninterval = timeval_to_cputime(&value->it_interval);
- spin_lock_irq(&tsk->sighand->siglock);
- cval = tsk->signal->it_virt_expires;
- cinterval = tsk->signal->it_virt_incr;
- if (!cputime_eq(cval, cputime_zero) ||
- !cputime_eq(nval, cputime_zero)) {
- if (cputime_gt(nval, cputime_zero))
- nval = cputime_add(nval,
- jiffies_to_cputime(1));
- set_process_cpu_timer(tsk, CPUCLOCK_VIRT,
- &nval, &cval);
- }
- tsk->signal->it_virt_expires = nval;
- tsk->signal->it_virt_incr = ninterval;
- spin_unlock_irq(&tsk->sighand->siglock);
- if (ovalue) {
- cputime_to_timeval(cval, &ovalue->it_value);
- cputime_to_timeval(cinterval, &ovalue->it_interval);
- }
+ set_cpu_itimer(tsk, IT_VIRT, value, ovalue);
break;
case ITIMER_PROF:
- nval = timeval_to_cputime(&value->it_value);
- ninterval = timeval_to_cputime(&value->it_interval);
- spin_lock_irq(&tsk->sighand->siglock);
- cval = tsk->signal->it_prof_expires;
- cinterval = tsk->signal->it_prof_incr;
- if (!cputime_eq(cval, cputime_zero) ||
- !cputime_eq(nval, cputime_zero)) {
- if (cputime_gt(nval, cputime_zero))
- nval = cputime_add(nval,
- jiffies_to_cputime(1));
- set_process_cpu_timer(tsk, CPUCLOCK_PROF,
- &nval, &cval);
- }
- tsk->signal->it_prof_expires = nval;
- tsk->signal->it_prof_incr = ninterval;
- spin_unlock_irq(&tsk->sighand->siglock);
- if (ovalue) {
- cputime_to_timeval(cval, &ovalue->it_value);
- cputime_to_timeval(cinterval, &ovalue->it_interval);
- }
+ set_cpu_itimer(tsk, IT_PROF, value, ovalue);
break;
default:
return -EINVAL;
diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index 8e5d9a6..76e125c 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -17,8 +17,8 @@ void update_rlimit_cpu(unsigned long rlim_new)
cputime_t cputime;
cputime = secs_to_cputime(rlim_new);
- if (cputime_eq(current->signal->it_prof_expires, cputime_zero) ||
- cputime_lt(current->signal->it_prof_expires, cputime)) {
+ if (cputime_eq(current->signal->it_expires[IT_PROF], cputime_zero) ||
+ cputime_lt(current->signal->it_expires[IT_PROF], cputime)) {
spin_lock_irq(¤t->sighand->siglock);
set_process_cpu_timer(current, CPUCLOCK_PROF, &cputime, NULL);
spin_unlock_irq(¤t->sighand->siglock);
@@ -619,18 +619,18 @@ static void arm_timer(struct k_itimer *timer, union cpu_time_count now)
default:
BUG();
case CPUCLOCK_VIRT:
- if (!cputime_eq(p->signal->it_virt_expires,
+ if (!cputime_eq(p->signal->it_expires[IT_VIRT],
cputime_zero) &&
- cputime_lt(p->signal->it_virt_expires,
+ cputime_lt(p->signal->it_expires[IT_VIRT],
timer->it.cpu.expires.cpu))
break;
p->signal->cputime_expires.virt_exp =
timer->it.cpu.expires.cpu;
break;
case CPUCLOCK_PROF:
- if (!cputime_eq(p->signal->it_prof_expires,
+ if (!cputime_eq(p->signal->it_expires[IT_PROF],
cputime_zero) &&
- cputime_lt(p->signal->it_prof_expires,
+ cputime_lt(p->signal->it_expires[IT_PROF],
timer->it.cpu.expires.cpu))
break;
i = p->signal->rlim[RLIMIT_CPU].rlim_cur;
@@ -1069,6 +1069,36 @@ static void stop_process_timers(struct task_struct *tsk)
spin_unlock_irqrestore(&cputimer->lock, flags);
}
+static cputime_t check_cpu_itimer(struct task_struct *tsk, enum itimer_number i,
+ cputime_t expires, cputime_t cur_time)
+{
+ struct signal_struct *const sig = tsk->signal;
+
+ if (cputime_eq(sig->it_expires[i], cputime_zero))
+ return expires;
+
+ if (cputime_ge(cur_time, sig->it_expires[i])) {
+ int signo;
+
+ sig->it_expires[i] = sig->it_incr[i];
+ if (!cputime_eq(sig->it_expires[i], cputime_zero)) {
+ sig->it_expires[i] = cputime_add(sig->it_expires[i],
+ cur_time);
+ }
+
+ signo = (i == IT_VIRT) ? SIGVTALRM : SIGPROF;
+ __group_send_sig_info(signo, SEND_SIG_PRIV, tsk);
+ }
+
+ if (!cputime_eq(sig->it_expires[i], cputime_zero) &&
+ (cputime_eq(expires, cputime_zero) ||
+ cputime_lt(sig->it_expires[i], expires))) {
+ expires = sig->it_expires[i];
+ }
+
+ return expires;
+}
+
/*
* Check for any per-thread CPU timers that have fired and move them
* off the tsk->*_timers list onto the firing list. Per-thread timers
@@ -1088,10 +1118,10 @@ static void check_process_timers(struct task_struct *tsk,
* Don't sample the current process CPU clocks if there are no timers.
*/
if (list_empty(&timers[CPUCLOCK_PROF]) &&
- cputime_eq(sig->it_prof_expires, cputime_zero) &&
+ cputime_eq(sig->it_expires[IT_PROF], cputime_zero) &&
sig->rlim[RLIMIT_CPU].rlim_cur == RLIM_INFINITY &&
list_empty(&timers[CPUCLOCK_VIRT]) &&
- cputime_eq(sig->it_virt_expires, cputime_zero) &&
+ cputime_eq(sig->it_expires[IT_VIRT], cputime_zero) &&
list_empty(&timers[CPUCLOCK_SCHED])) {
stop_process_timers(tsk);
return;
@@ -1151,38 +1181,9 @@ static void check_process_timers(struct task_struct *tsk,
/*
* Check for the special case process timers.
*/
- if (!cputime_eq(sig->it_prof_expires, cputime_zero)) {
- if (cputime_ge(ptime, sig->it_prof_expires)) {
- /* ITIMER_PROF fires and reloads. */
- sig->it_prof_expires = sig->it_prof_incr;
- if (!cputime_eq(sig->it_prof_expires, cputime_zero)) {
- sig->it_prof_expires = cputime_add(
- sig->it_prof_expires, ptime);
- }
- __group_send_sig_info(SIGPROF, SEND_SIG_PRIV, tsk);
- }
- if (!cputime_eq(sig->it_prof_expires, cputime_zero) &&
- (cputime_eq(prof_expires, cputime_zero) ||
- cputime_lt(sig->it_prof_expires, prof_expires))) {
- prof_expires = sig->it_prof_expires;
- }
- }
- if (!cputime_eq(sig->it_virt_expires, cputime_zero)) {
- if (cputime_ge(utime, sig->it_virt_expires)) {
- /* ITIMER_VIRTUAL fires and reloads. */
- sig->it_virt_expires = sig->it_virt_incr;
- if (!cputime_eq(sig->it_virt_expires, cputime_zero)) {
- sig->it_virt_expires = cputime_add(
- sig->it_virt_expires, utime);
- }
- __group_send_sig_info(SIGVTALRM, SEND_SIG_PRIV, tsk);
- }
- if (!cputime_eq(sig->it_virt_expires, cputime_zero) &&
- (cputime_eq(virt_expires, cputime_zero) ||
- cputime_lt(sig->it_virt_expires, virt_expires))) {
- virt_expires = sig->it_virt_expires;
- }
- }
+ prof_expires = check_cpu_itimer(tsk, IT_PROF, prof_expires, ptime);
+ virt_expires = check_cpu_itimer(tsk, IT_VIRT, virt_expires, utime);
+
if (sig->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY) {
unsigned long psecs = cputime_to_secs(ptime);
cputime_t x;
--
1.6.0.6
--
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