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rcu: Move PREEMPT_RCU preemption to switch_to() invocation

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Currently, PREEMPT_RCU readers are enqueued upon entry to the scheduler.
This is inefficient because enqueuing is required only if there is a
context switch, and entry to the scheduler does not guarantee a context
switch.

The commit therefore moves the enqueuing to immediately precede the
call to switch_to() from the scheduler.

Signed-off-by: Paul E. McKenney <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>
Tested-by: Linus Torvalds <[email protected]>
This commit is contained in:
Paul E. McKenney 2012-03-27 16:02:08 -07:00 • committed by Paul E. McKenney
commit 616c310e83
8 changed files with 16 additions and 19 deletions
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1
kernel/sched/core.c
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@ -2083,6 +2083,7 @@ context_switch(struct rq *rq, struct task_struct *prev,
#endif
/* Here we just switch the register state and the stack. */
rcu_switch_from(prev);
switch_to(prev, next, prev);
barrier();