rcu: Avoid having just-onlined CPU resched itself when RCU is idle

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CPUs set rdp->qs_pending when coming online to resolve races with
grace-period start.  However, this means that if RCU is idle, the
just-onlined CPU might needlessly send itself resched IPIs.  Adjust
the online-CPU initialization to avoid this, and also to correctly
cause the CPU to respond to the current grace period if needed.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Tested-by: Josh Boyer <jwboyer@redhat.com>
Tested-by: Christian Hoffmann <email@christianhoffmann.info>

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Paul E. McKenney 2011-08-14 15:56:54 -07:00

parent 9bc8b5586f

commit 06ae115a1d

1 changed files with 8 additions and 3 deletions

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kernel/rcutree.c

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