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

Waiman Long
2022-06-01T21:18:48Z

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(-)

--
2.31.1