linux-kernel - Re: [PATCH tip/core/rcu 0/7] Miscellaneous fixes for 4.10

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Date:   Mon, 14 Nov 2016 09:26:45 -0800
From:   Josh Triplett <josh@...htriplett.org>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     linux-kernel@...r.kernel.org, mingo@...nel.org,
        jiangshanlai@...il.com, dipankar@...ibm.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
        dhowells@...hat.com, edumazet@...gle.com, dvhart@...ux.intel.com,
        fweisbec@...il.com, oleg@...hat.com, bobby.prani@...il.com
Subject: Re: [PATCH tip/core/rcu 0/7] Miscellaneous fixes for 4.10

On Mon, Nov 14, 2016 at 08:56:48AM -0800, Paul E. McKenney wrote:
> Hello!
> 
> This series contains miscellaneous fixes to RCU:
> 
> 1.	Tighten up __call_rcu's alignment check for the rcu_head structure
> 	now that no arch does two-byte alignment of pointers.
> 
> 2.	Remove obsolete comment about when rcu_check_callbacks() was invoked.
> 
> 3.	Remove obsolete comment about which function opportunistically
> 	notes grace periods beginnings and endings.
> 
> 4.	Update the RCU_TRACE Kconfig option's help text to note that
> 	it enables event tracing in addition to debugfs, courtesy of
> 	Nikolay Borisov.
> 
> 5.	Add event tracing for long read-side delays in rcutorture
> 	in order to better debug too-short grace periods.
> 
> 6.	Make expedited grace periods recheck dyntick-idle state to avoid
> 	sending needless IPIs.
> 
> 7.	Don't kick CPUs unless there is grace-period activity currently
> 	in progress.

I replied to patches 5 and 6 with comments.  For 1-4 and 7:
Reviewed-by: Josh Triplett <josh@...htriplett.org>