From: Shaohua Li <shaohua.li@intel.com>
Date: Thu, 16 Jun 2011 23:02:54 +0000 (-0700)
Subject: rcu: Avoid unnecessary self-wakeup of per-CPU kthreads
X-Git-Tag: v3.2-rc1~165^2^2~43
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1eb521210a8c9823038abe4ddfe8c69e713ec17d;p=pandora-kernel.git

rcu: Avoid unnecessary self-wakeup of per-CPU kthreads

There are a number of cases where the RCU can find additional work
for the per-CPU kthread within the context of that per-CPU kthread.
In such cases, the per-CPU kthread is already running, so attempting
to wake itself up does nothing except waste CPU cycles.  This commit
therefore checks to see if it is in the per-CPU kthread context,
omitting the wakeup in this case.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---

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