From: Paul E. McKenney Date: Tue, 1 Apr 2014 18:20:36 +0000 (-0700) Subject: rcu: Bind RCU grace-period kthreads if NO_HZ_FULL X-Git-Tag: omap-for-v3.16/fixes-against-rc1~39^2~26^2^2~2^2~4 X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5057f55e543b7859cfd26bc281291795eac93f8a;p=pandora-kernel.git rcu: Bind RCU grace-period kthreads if NO_HZ_FULL Currently, RCU binds the grace-period kthreads to the timekeeping CPU only if CONFIG_NO_HZ_FULL_SYSIDLE=y. This means that these kthreads must be bound manually when CONFIG_NO_HZ_FULL_SYSIDLE=n and CONFIG_NO_HZ_FULL=y: Otherwise, these kthreads will induce OS jitter on random CPUs. Given that we are trying to reduce the amount of manual tweaking required to make CONFIG_NO_HZ_FULL=y work nicely, this commit makes this binding happen when CONFIG_NO_HZ_FULL=y, even in cases where CONFIG_NO_HZ_FULL_SYSIDLE=n. Signed-off-by: Paul E. McKenney Reviewed-by: Josh Triplett --- Reading git-diff-tree failed