linux-kernel - Re: [PATCH 0/3] task: Making tasks on the runqueue rcu protected

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Date:   Tue, 3 Sep 2019 15:58:31 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Peter Zijlstra <peterz@...radead.org>,
        Chris Metcalf <cmetcalf@...hip.com>,
        Christoph Lameter <cl@...ux.com>,
        Kirill Tkhai <tkhai@...dex.ru>, Mike Galbraith <efault@....de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Davidlohr Bueso <dave@...olabs.net>
Subject: Re: [PATCH 0/3] task: Making tasks on the runqueue rcu protected

On 09/02, Eric W. Biederman wrote:
>
> Oleg do you have any issues with this code?

OK, let it be refcount_t, I agree it looks more readable.

> Eric W. Biederman (3):
>       task: Add a count of task rcu users
>       task: RCU protect tasks on the runqueue
>       task: Clean house now that tasks on the runqueue are rcu protected
> 
>  include/linux/rcuwait.h    | 20 +++----------
>  include/linux/sched.h      |  5 +++-
>  include/linux/sched/task.h |  2 +-
>  kernel/exit.c              | 74 ++++------------------------------------------
>  kernel/fork.c              |  8 +++--
>  kernel/sched/core.c        |  7 +++--
>  kernel/sched/fair.c        |  2 +-
>  kernel/sched/membarrier.c  |  4 +--
>  8 files changed, 27 insertions(+), 95 deletions(-)

Reviewed-by: Oleg Nesterov <oleg@...hat.com>