rcu: substitute set_need_resched for sending resched IPIs

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This patch adds a check to __rcu_pending() that does a local
set_need_resched() if the current CPU is holding up the current grace
period and if force_quiescent_state() will be called soon.  The goal is
to reduce the probability that force_quiescent_state() will need to do
smp_send_reschedule(), which sends an IPI and is therefore more expensive
on most architectures.

Signed-off-by: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>

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Paul E. McKenney 2010-03-18 21:36:51 -07:00

parent 2b3fc35f69

commit d25eb9442b

1 changed files with 10 additions and 0 deletions

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kernel/rcutree.c

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