[0/4] rcu/nocb: Shrinker related boring fixes

Message

Frederic Weisbecker March 22, 2023, 7:44 p.m. UTC

Hi,

Just a couple of boring fixes related to the shrinker.

1/4: is related to (de-)offloading so the issue only concerns rcutorture
     right now (which doesn't seem to test lazy so hardly possible to trigger).

2/4: fix ignored flush, making the shrinker more efficient but nothing
     critical.

3/4: optimization

4/4: optimization

As such none of these patches carry a "Fixes:" because none fix an actual
regression. Nothing worth backportng.

Frederic Weisbecker (4):
  rcu/nocb: Protect lazy shrinker against concurrent (de-)offloading
  rcu/nocb: Fix shrinker race against callback enqueuer
  rcu/nocb: Recheck lazy callbacks under the ->nocb_lock from shrinker
  rcu/nocb: Make shrinker to iterate only NOCB CPUs

 kernel/rcu/tree_nocb.h | 43 +++++++++++++++++++++++++++++++++++++-----
 1 file changed, 38 insertions(+), 5 deletions(-)