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Date:   Sun, 3 Nov 2019 14:01:41 -0500
From:   "Theodore Y. Ts'o" <>
To:     Jan Kara <>
Cc:, Thomas Gleixner <>,
        Peter Zijlstra <>,
        Ingo Molnar <>,
        Steven Rostedt <>,
        Anna-Maria Gleixner <>,
        Julia Cartwright <>
Subject: Re: [PATCH 0/7 v2] jbd2: Bit spinlock conversions

On Fri, Aug 09, 2019 at 02:42:26PM +0200, Jan Kara wrote:
> Hello,
> This series is derived from Thomas' series to get rid of bit spinlocks in
> buffer head code. These patches convert BH_State bit spinlock to an ordinary
> spinlock inside struct journal_head and somewhat reduce the critical section
> under BH_JournalHead bit spinlock so that it is fine for RT. 
> Motivation from original Thomas' series:
> Bit spinlocks are problematic if PREEMPT_RT is enabled. They disable
> preemption, which is undesired for latency reasons and breaks when regular
> spinlocks are taken within the bit_spinlock locked region because regular
> spinlocks are converted to 'sleeping spinlocks' on RT.
> Bit spinlocks are also not covered by lock debugging, e.g. lockdep. With
> the spinlock substitution in place, they can be exposed via a new config
> Ted, can you pick up these patches? Thanks!

I've landed this patch set on the ext4 git tree.  Thanks!

     	    	       	      	       - Ted

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