Re: [PATCH] kfree_rcu() should use the new kfree_bulk() interface for freeing rcu structures

[Matthew Wilcox]

On Tue, Dec 19, 2017 at 09:52:27AM -0800, rao.shoaib@xxxxxxxxxx wrote:
> This patch updates kfree_rcu to use new bulk memory free functions as they
> are more efficient. It also moves kfree_call_rcu() out of rcu related code to
> mm/slab_common.c
> 
> Signed-off-by: Rao Shoaib <rao.shoaib@xxxxxxxxxx>
> ---
>  include/linux/mm.h |   5 ++
>  kernel/rcu/tree.c  |  14 ----
>  kernel/sysctl.c    |  40 +++++++++++
>  mm/slab.h          |  23 +++++++
>  mm/slab_common.c   | 198 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
>  5 files changed, 264 insertions(+), 16 deletions(-)

You've added an awful lot of code.  Do you have any performance measurements
that shows this to be a win?