On Mon, Oct 13, 2014 at 4:01 PM, Kamal Mostafa <ka...@canonical.com> wrote: > On Mon, 2014-10-13 at 12:29 -0400, Pranith Kumar wrote: >> Backport 2aa792e and parts of 48a7639 to 3.13 which is Ubuntu LTS kernel. >> >> This commit reduces the number of rcu kthread wakeups. Tested for over a >> week on >> my desktop 14.04 system. >> >> Signed-off-by: Pranith Kumar <bobby.pr...@gmail.com> >> CC: Paul E. McKenney <paul...@linux.vnet.ibm.com> > > > Hi Pranith and Paul- > > This looks good, but how about lets split it back into two commits (the > second a clean cherry-pick) and submit it for 3.{14,16,17}-stable also: > > 3.13 and 3.14 could apply the attached 48a7639 mini-backport (just > supplying rcu_gp_kthread_wake), and then cherry-pick 2aa792e. > > 3.16 and 3.17 carry 48a7639 already, so could just cherry-pick 2aa792e. >
The patch looks good. The commit message can be trimmed to just the last para: Add a new rcu_gp_kthread_wake() which wakes up the gp kthread when it is necessary and safe to do so: No self-wakes, no wake-ups if the ->gp_flags field indicates there is no need (as in someone else did the wake-up before we got around to it), and no wake-ups before the grace-period kthread has been created. Thanks! -- Pranith -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/