linux-kernel - [PATCH 0/4] kvfree_rcu() and _LOCK_NESTING/_PREEMPT

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Message-Id: <20200918194817.48921-1-urezki@gmail.com>
Date:   Fri, 18 Sep 2020 21:48:13 +0200
From:   "Uladzislau Rezki (Sony)" <urezki@...il.com>
To:     LKML <linux-kernel@...r.kernel.org>, RCU <rcu@...r.kernel.org>,
        linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        "Paul E . McKenney" <paulmck@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Michal Hocko <mhocko@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Theodore Y . Ts'o" <tytso@....edu>,
        Joel Fernandes <joel@...lfernandes.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Uladzislau Rezki <urezki@...il.com>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...ymobile.com>
Subject: [PATCH 0/4] kvfree_rcu() and _LOCK_NESTING/_PREEMPT_RT 

Hello, folk!

This is another iteration of fixing kvfree_rcu() issues related
to CONFIG_PROVE_RAW_LOCK_NESTING and CONFIG_PREEMPT_RT configs.

The first discussion is here https://lkml.org/lkml/2020/8/9/195.

- As an outcome of it, there was a proposal from Peter, instead of
using a speciall "lock-less" flag it is better to move lock-less
access to the pcplist to the separate function.

- To add a special worker thread that does prefetching of pages
if a per-cpu page cache is depleted(what is absolutely normal). 

As usual, thank you for paying attention to it and your help!

Uladzislau Rezki (Sony) (4):
  rcu/tree: Add a work to allocate pages from regular context
  mm: Add __rcu_alloc_page_lockless() func.
  rcu/tree: use __rcu_alloc_page_lockless() func.
  rcu/tree: Use schedule_delayed_work() instead of WQ_HIGHPRI queue

 include/linux/gfp.h |  1 +
 kernel/rcu/tree.c   | 90 ++++++++++++++++++++++++---------------------
 mm/page_alloc.c     | 82 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 132 insertions(+), 41 deletions(-)

-- 
2.20.1