linux-kernel - [PATCH 0/4] rcu/nocb: Shrinker related boring fixes

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Date:   Wed, 22 Mar 2023 20:44:52 +0100
From:   Frederic Weisbecker <frederic@...nel.org>
To:     "Paul E . McKenney" <paulmck@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        rcu <rcu@...r.kernel.org>, Uladzislau Rezki <urezki@...il.com>,
        Neeraj Upadhyay <quic_neeraju@...cinc.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Joel Fernandes <joel@...lfernandes.org>
Subject: [PATCH 0/4] rcu/nocb: Shrinker related boring fixes

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(-)

-- 
2.34.1