Commit-ID: 246d86b51845063e4b06b27579990492dc5fa317
Gitweb: http://git.kernel.org/tip/246d86b51845063e4b06b27579990492dc5fa317
Author: Oleg Nesterov <oleg@xxxxxxxxxx>
AuthorDate: Wed, 19 May 2010 14:57:11 +0200
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Wed, 9 Jun 2010 10:34:50 +0200
sched: Simplify the reacquire_kernel_lock() logic
- Contrary to what 6d558c3a says, there is no need to reload
prev = rq->curr after the context switch. You always schedule
back to where you came from, prev must be equal to current
even if cpu/rq was changed.
- This also means reacquire_kernel_lock() can use prev instead
of current.
- No need to reassign switch_count if reacquire_kernel_lock()
reports need_resched(), we can just move the initial assignment
down, under the "need_resched_nonpreemptible:" label.
- Try to update the comment after context_switch().
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
LKML-Reference: <20100519125711.GA30199@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
kernel/sched.c | 13 ++++++-------
1 files changed, 6 insertions(+), 7 deletions(-)
diff --git a/kernel/sched.c b/kernel/sched.c
index 3abd8f7..f37a961 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3636,7 +3636,6 @@ need_resched:
rq = cpu_rq(cpu);
rcu_note_context_switch(cpu);
prev = rq->curr;
- switch_count = &prev->nivcsw;
release_kernel_lock(prev);
need_resched_nonpreemptible:
@@ -3649,6 +3648,7 @@ need_resched_nonpreemptible:
raw_spin_lock_irq(&rq->lock);
clear_tsk_need_resched(prev);
+ switch_count = &prev->nivcsw;
if (prev->state && !(preempt_count() & PREEMPT_ACTIVE)) {
if (unlikely(signal_pending_state(prev->state, prev))) {
prev->state = TASK_RUNNING;
@@ -3689,8 +3689,10 @@ need_resched_nonpreemptible:
context_switch(rq, prev, next); /* unlocks the rq */
/*
- * the context switch might have flipped the stack from under
- * us, hence refresh the local variables.
+ * The context switch have flipped the stack from under us
+ * and restored the local variables which were saved when
+ * this task called schedule() in the past. prev == current
+ * is still correct, but it can be moved to another cpu/rq.
*/
cpu = smp_processor_id();
rq = cpu_rq(cpu);
@@ -3699,11 +3701,8 @@ need_resched_nonpreemptible:
post_schedule(rq);
- if (unlikely(reacquire_kernel_lock(current) < 0)) {
- prev = rq->curr;
- switch_count = &prev->nivcsw;
+ if (unlikely(reacquire_kernel_lock(prev)))
goto need_resched_nonpreemptible;
- }
preempt_enable_no_resched();
if (need_resched())
--
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