linux-kernel - [PATCH 00/16] rcu/nocb: De-offload and re-offload support v3

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20201023144649.53046-1-frederic@kernel.org>
Date:   Fri, 23 Oct 2020 16:46:33 +0200
From:   Frederic Weisbecker <frederic@...nel.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Neeraj Upadhyay <neeraju@...eaurora.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Josh Triplett <josh@...htriplett.org>
Subject: [PATCH 00/16] rcu/nocb: De-offload and re-offload support v3

Hi,

This is the third attempt to make rcu-nocb mutable at runtime. See
v2 there: https://lwn.net/Articles/832031/

Many fixes included and rcutorture support:

03: Whitespace fix
04: Add "rcu/nocb: Always init segcblist on CPU up" (Thanks rcutorture!)
05: Add return value for failure on (de)offloading
06: Add "rcu/nocb: Don't deoffload an offline CPU with pending work" (Thanks Paul!)
12: Add "rcu/nocb: Only cond_resched() from actual offloaded batch processing" (Thanks rcutorture!)
14: Write a real and more self-confident changelog
15/16: Add rcutorture support (thanks Paul!)

My last remaining worry, as exposed in 13/16, is that __call_rcu_core()
isn't called during transition states. I need to see how I can handle
that.

git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
	rcu/nocb-toggle-v2

HEAD: 0247cd09fd48a38741e5cc6634810985b405baca

Thanks,
	Frederic
---

Frederic Weisbecker (15):
      rcu: Implement rcu_segcblist_is_offloaded() config dependent
      rcu: Turn enabled/offload states into a common flag
      rcu: Provide basic callback offloading state machine bits
      rcu/nocb: Always init segcblist on CPU up
      rcu: De-offloading CB kthread
      rcu/nocb: Don't deoffload an offline CPU with pending work
      rcu: De-offloading GP kthread
      rcu: Re-offload support
      rcu: Shutdown nocb timer on de-offloading
      rcu: Flush bypass before setting SEGCBLIST_SOFTIRQ_ONLY
      rcu: Set SEGCBLIST_SOFTIRQ_ONLY at the very last stage of de-offloading
      rcu/nocb: Only cond_resched() from actual offloaded batch processing
      rcu: Process batch locally as long as offloading isn't complete
      rcu: Locally accelerate callbacks as long as offloading isn't complete
      tools/rcutorture: Support nocb toggle in TREE01

Paul E. McKenney (1):
      rcutorture: Test runtime toggling of CPUs' callback offloading


 Documentation/admin-guide/kernel-parameters.txt    |   8 +
 include/linux/rcu_segcblist.h                      | 119 +++++++-
 include/linux/rcupdate.h                           |   4 +
 kernel/rcu/rcu_segcblist.c                         |  13 +-
 kernel/rcu/rcu_segcblist.h                         |  45 ++-
 kernel/rcu/rcutorture.c                            |  86 +++++-
 kernel/rcu/tree.c                                  |  47 +--
 kernel/rcu/tree.h                                  |   2 +
 kernel/rcu/tree_plugin.h                           | 330 +++++++++++++++++++--
 .../selftests/rcutorture/configs/rcu/TREE01.boot   |   4 +-
 10 files changed, 603 insertions(+), 55 deletions(-)