mbox series

[v3,0/2] blk-cgroup: Optimize blkcg_rstat_flush()

Message ID 20220601211824.89626-1-longman@redhat.com (mailing list archive)
Headers show
Series blk-cgroup: Optimize blkcg_rstat_flush() | expand

Message

Waiman Long June 1, 2022, 9:18 p.m. UTC 
This is a follow-up of [1]. There is no change in patch 1. Patch 2 has
the following changes:
 - Update comments in patch 2.
 - Put rcu_read_lock/unlock() in blkcg_rstat_flush().
 - Use READ_ONCE/WRITE_ONCE() to access lnode->next to reduce data
   races.
 - Get a blkg reference when putting into the lockless list and put it
   back when removed.

[1] https://lore.kernel.org/lkml/20220601165324.60892-1-longman@redhat.com/

Waiman Long (2):
  blk-cgroup: Correctly free percpu iostat_cpu in blkg on error exit
  blk-cgroup: Optimize blkcg_rstat_flush()

 block/blk-cgroup.c | 92 ++++++++++++++++++++++++++++++++++++++++++----
 block/blk-cgroup.h |  9 +++++
 2 files changed, 93 insertions(+), 8 deletions(-)