rcu: Add boot/sysfs control for RCU cond_resched() help solicitation
This commit replaces the hard-coded seven-jiffy cond_resched()
quiescent-state solicitation delay with a delay that can be set via
the rcutree.jiffies_till_cond_resched_qs boot parameter, or of course
via sysfs. This change was inspired in part by Dave Hansen's time-based
approach: https://lkml.org/lkml/2014/6/17/746.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Christoph Lameter <cl@gentwo.org>
Cc: Mike Galbraith <umgwanakikbuti@gmail.com>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2 files changed
