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Subject: vtime-split-lock-and-seqcount.patch
From: Thomas Gleixner <tglx@linutronix.de>
Date: Tue, 23 Jul 2013 15:45:51 +0200
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.0/patches-4.0.4-rt1.tar.xz
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
include/linux/init_task.h | 3 +-
include/linux/sched.h | 3 +-
kernel/fork.c | 3 +-
kernel/sched/cputime.c | 62 +++++++++++++++++++++++++++++-----------------
4 files changed, 46 insertions(+), 25 deletions(-)
--- a/include/linux/init_task.h
+++ b/include/linux/init_task.h
@@ -149,7 +149,8 @@ extern struct task_group root_task_group
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
# define INIT_VTIME(tsk) \
- .vtime_seqlock = __SEQLOCK_UNLOCKED(tsk.vtime_seqlock), \
+ .vtime_lock = __RAW_SPIN_LOCK_UNLOCKED(tsk.vtime_lock), \
+ .vtime_seq = SEQCNT_ZERO(tsk.vtime_seq), \
.vtime_snap = 0, \
.vtime_snap_whence = VTIME_SYS,
#else
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1428,7 +1428,8 @@ struct task_struct {
struct cputime prev_cputime;
#endif
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
- seqlock_t vtime_seqlock;
+ raw_spinlock_t vtime_lock;
+ seqcount_t vtime_seq;
unsigned long long vtime_snap;
enum {
VTIME_SLEEPING = 0,
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1299,7 +1299,8 @@ static struct task_struct *copy_process(
p->prev_cputime.utime = p->prev_cputime.stime = 0;
#endif
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
- seqlock_init(&p->vtime_seqlock);
+ raw_spin_lock_init(&p->vtime_lock);
+ seqcount_init(&p->vtime_seq);
p->vtime_snap = 0;
p->vtime_snap_whence = VTIME_SLEEPING;
#endif
--- a/kernel/sched/cputime.c
+++ b/kernel/sched/cputime.c
@@ -675,37 +675,45 @@ static void __vtime_account_system(struc
void vtime_account_system(struct task_struct *tsk)
{
- write_seqlock(&tsk->vtime_seqlock);
+ raw_spin_lock(&tsk->vtime_lock);
+ write_seqcount_begin(&tsk->vtime_seq);
__vtime_account_system(tsk);
- write_sequnlock(&tsk->vtime_seqlock);
+ write_seqcount_end(&tsk->vtime_seq);
+ raw_spin_unlock(&tsk->vtime_lock);
}
void vtime_gen_account_irq_exit(struct task_struct *tsk)
{
- write_seqlock(&tsk->vtime_seqlock);
+ raw_spin_lock(&tsk->vtime_lock);
+ write_seqcount_begin(&tsk->vtime_seq);
__vtime_account_system(tsk);
if (context_tracking_in_user())
tsk->vtime_snap_whence = VTIME_USER;
- write_sequnlock(&tsk->vtime_seqlock);
+ write_seqcount_end(&tsk->vtime_seq);
+ raw_spin_unlock(&tsk->vtime_lock);
}
void vtime_account_user(struct task_struct *tsk)
{
cputime_t delta_cpu;
- write_seqlock(&tsk->vtime_seqlock);
+ raw_spin_lock(&tsk->vtime_lock);
+ write_seqcount_begin(&tsk->vtime_seq);
delta_cpu = get_vtime_delta(tsk);
tsk->vtime_snap_whence = VTIME_SYS;
account_user_time(tsk, delta_cpu, cputime_to_scaled(delta_cpu));
- write_sequnlock(&tsk->vtime_seqlock);
+ write_seqcount_end(&tsk->vtime_seq);
+ raw_spin_unlock(&tsk->vtime_lock);
}
void vtime_user_enter(struct task_struct *tsk)
{
- write_seqlock(&tsk->vtime_seqlock);
+ raw_spin_lock(&tsk->vtime_lock);
+ write_seqcount_begin(&tsk->vtime_seq);
__vtime_account_system(tsk);
tsk->vtime_snap_whence = VTIME_USER;
- write_sequnlock(&tsk->vtime_seqlock);
+ write_seqcount_end(&tsk->vtime_seq);
+ raw_spin_unlock(&tsk->vtime_lock);
}
void vtime_guest_enter(struct task_struct *tsk)
@@ -717,19 +725,23 @@ void vtime_guest_enter(struct task_struc
* synchronization against the reader (task_gtime())
* that can thus safely catch up with a tickless delta.
*/
- write_seqlock(&tsk->vtime_seqlock);
+ raw_spin_lock(&tsk->vtime_lock);
+ write_seqcount_begin(&tsk->vtime_seq);
__vtime_account_system(tsk);
current->flags |= PF_VCPU;
- write_sequnlock(&tsk->vtime_seqlock);
+ write_seqcount_end(&tsk->vtime_seq);
+ raw_spin_unlock(&tsk->vtime_lock);
}
EXPORT_SYMBOL_GPL(vtime_guest_enter);
void vtime_guest_exit(struct task_struct *tsk)
{
- write_seqlock(&tsk->vtime_seqlock);
+ raw_spin_lock(&tsk->vtime_lock);
+ write_seqcount_begin(&tsk->vtime_seq);
__vtime_account_system(tsk);
current->flags &= ~PF_VCPU;
- write_sequnlock(&tsk->vtime_seqlock);
+ write_seqcount_end(&tsk->vtime_seq);
+ raw_spin_unlock(&tsk->vtime_lock);
}
EXPORT_SYMBOL_GPL(vtime_guest_exit);
@@ -742,24 +754,30 @@ void vtime_account_idle(struct task_stru
void arch_vtime_task_switch(struct task_struct *prev)
{
- write_seqlock(&prev->vtime_seqlock);
+ raw_spin_lock(&prev->vtime_lock);
+ write_seqcount_begin(&prev->vtime_seq);
prev->vtime_snap_whence = VTIME_SLEEPING;
- write_sequnlock(&prev->vtime_seqlock);
+ write_seqcount_end(&prev->vtime_seq);
+ raw_spin_unlock(&prev->vtime_lock);
- write_seqlock(&current->vtime_seqlock);
+ raw_spin_lock(&current->vtime_lock);
+ write_seqcount_begin(&current->vtime_seq);
current->vtime_snap_whence = VTIME_SYS;
current->vtime_snap = sched_clock_cpu(smp_processor_id());
- write_sequnlock(&current->vtime_seqlock);
+ write_seqcount_end(&current->vtime_seq);
+ raw_spin_unlock(&current->vtime_lock);
}
void vtime_init_idle(struct task_struct *t, int cpu)
{
unsigned long flags;
- write_seqlock_irqsave(&t->vtime_seqlock, flags);
+ raw_spin_lock_irqsave(&t->vtime_lock, flags);
+ write_seqcount_begin(&t->vtime_seq);
t->vtime_snap_whence = VTIME_SYS;
t->vtime_snap = sched_clock_cpu(cpu);
- write_sequnlock_irqrestore(&t->vtime_seqlock, flags);
+ write_seqcount_end(&t->vtime_seq);
+ raw_spin_unlock_irqrestore(&t->vtime_lock, flags);
}
cputime_t task_gtime(struct task_struct *t)
@@ -768,13 +786,13 @@ cputime_t task_gtime(struct task_struct
cputime_t gtime;
do {
- seq = read_seqbegin(&t->vtime_seqlock);
+ seq = read_seqcount_begin(&t->vtime_seq);
gtime = t->gtime;
if (t->flags & PF_VCPU)
gtime += vtime_delta(t);
- } while (read_seqretry(&t->vtime_seqlock, seq));
+ } while (read_seqcount_retry(&t->vtime_seq, seq));
return gtime;
}
@@ -797,7 +815,7 @@ fetch_task_cputime(struct task_struct *t
*udelta = 0;
*sdelta = 0;
- seq = read_seqbegin(&t->vtime_seqlock);
+ seq = read_seqcount_begin(&t->vtime_seq);
if (u_dst)
*u_dst = *u_src;
@@ -821,7 +839,7 @@ fetch_task_cputime(struct task_struct *t
if (t->vtime_snap_whence == VTIME_SYS)
*sdelta = delta;
}
- } while (read_seqretry(&t->vtime_seqlock, seq));
+ } while (read_seqcount_retry(&t->vtime_seq, seq));
}
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