Re: [PATCH 0/5] kfree_rcu() additions for -rcu

Paul E. McKenney
2019-08-28T20:28:50Z

On Tue, Aug 27, 2019 at 03:01:54PM -0400, Joel Fernandes (Google) wrote:
> Hi,
>
> This is a series on top of the patch "rcu/tree: Add basic support for kfree_rcu() batching".
>
> Link: http://lore.kernel.org/r/20190814160411.58591-1-joel@joelfernandes.org
>
> It adds performance tests, some clean ups and removal of "lazy" RCU callbacks.
>
> Now that kfree_rcu() is handled separately from call_rcu(), we also get rid of
> kfree "lazy" handling from tree RCU as suggested by Paul which will be unused.
> This also results in a nice negative delta as well.
>
> Joel Fernandes (Google) (5):
> rcu/rcuperf: Add kfree_rcu() performance Tests
> rcu/tree: Add multiple in-flight batches of kfree_rcu work
> rcu/tree: Add support for debug_objects debugging for kfree_rcu()
> rcu: Remove kfree_rcu() special casing and lazy handling
> rcu: Remove kfree_call_rcu_nobatch()
>
> Documentation/RCU/stallwarn.txt | 13 +-
> .../admin-guide/kernel-parameters.txt | 13 ++
> include/linux/rcu_segcblist.h | 2 -
> include/linux/rcutiny.h | 5 -
> include/linux/rcutree.h | 1 -
> include/trace/events/rcu.h | 32 ++--
> kernel/rcu/rcu.h | 27 ---
> kernel/rcu/rcu_segcblist.c | 25 +--
> kernel/rcu/rcu_segcblist.h | 25 +--
> kernel/rcu/rcuperf.c | 173 +++++++++++++++++-
> kernel/rcu/srcutree.c | 4 +-
> kernel/rcu/tiny.c | 29 ++-
> kernel/rcu/tree.c | 145 ++++++++++-----
> kernel/rcu/tree.h | 1 -
> kernel/rcu/tree_plugin.h | 42 +----
> kernel/rcu/tree_stall.h | 6 +-
> 16 files changed, 337 insertions(+), 206 deletions(-)

Looks like a 131-line positive delta to me. ;-)

Thanx, Paul