From: Paul E. McKenney Date: Thu, 4 Apr 2013 05:14:11 +0000 (-0700) Subject: rcu: Drive quiescent-state-forcing delay from HZ X-Git-Tag: omap-for-v3.11/fixes-for-merge-window~64^2^2^3~2 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=026ad2835ce6202069e7aa0b11f5f1be4de34550;p=pandora-kernel.git rcu: Drive quiescent-state-forcing delay from HZ Systems with HZ=100 can have slow bootup times due to the default three-jiffy delays between quiescent-state forcing attempts. This commit therefore auto-tunes the RCU_JIFFIES_TILL_FORCE_QS value based on the value of HZ. However, this would break very large systems that require more time between quiescent-state forcing attempts. This commit therefore also ups the default delay by one jiffy for each 256 CPUs that might be on the system (based off of nr_cpu_ids at runtime, -not- NR_CPUS at build time). Updated to collapse #ifdefs for RCU_JIFFIES_TILL_FORCE_QS into a step-function definition as suggested by Josh Triplett. Reported-by: Paul Mackerras Signed-off-by: Paul E. McKenney --- Reading git-diff-tree failed