linux-kernel - Re: [PATCH v2 0/9] rcu: Cleanup RCU tree initialization

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Message-ID: <20150601185811.GZ5989@linux.vnet.ibm.com>
Date:	Mon, 1 Jun 2015 11:58:11 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Alexander Gordeev <agordeev@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH v2 0/9] rcu: Cleanup RCU tree initialization

On Fri, May 29, 2015 at 11:53:36AM +0200, Alexander Gordeev wrote:
> Hello Paul,
> 
> This is 2nd attempt to make RCU tree initialization bit more
> clear and optimize memory footprint of data associated with
> the tree.

Thank you for sending these -- please see the comment on patch #1.
I have queued these for testing in the meantime, but please either
explain why I am wrong or resend the set with the fix.

							Thanx, Paul

> Changes since v1:
>   - patch 3 fixed to accomodate nr_cpus=1, otherwise rcu_num_lvls
>     would yield zero, which is wrong;
> 
> The series is against "linux-rcu" tree "rcu/dev" branch
> 
> Thanks!
> 
> Cc: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> 
> Alexander Gordeev (9):
>   rcu: Panic if RCU tree can not accommodate all CPUs
>   rcu: Remove superfluous local variable in rcu_init_geometry()
>   rcu: Cleanup rcu_init_geometry() code and arithmetics
>   rcu: Simplify rcu_init_geometry() capacity arithmetics
>   rcu: Limit rcu_state::levelcnt[] to RCU_NUM_LVLS items
>   rcu: Limit rcu_capacity[] size to RCU_NUM_LVLS items
>   rcu: Remove unnecessary fields from rcu_state structure
>   rcu: Limit count of static data to the number of RCU levels
>   rcu: Simplify arithmetic to calculate number of RCU nodes
> 
>  kernel/rcu/tree.c        | 99 +++++++++++++++++++++---------------------------
>  kernel/rcu/tree.h        | 33 ++++++++--------
>  kernel/rcu/tree_plugin.h |  4 +-
>  3 files changed, 61 insertions(+), 75 deletions(-)
> 
> -- 
> 1.8.3.1
> 

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