linux-kernel - Re: [PATCH 10/24] rcu/tree: add rcutree.rcu_min_cached

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Message-ID: <20200501222524.GA6283@paulmck-ThinkPad-P72>
Date:   Fri, 1 May 2020 15:25:24 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     "Uladzislau Rezki (Sony)" <urezki@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Theodore Y . Ts'o" <tytso@....edu>,
        Matthew Wilcox <willy@...radead.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        RCU <rcu@...r.kernel.org>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...ymobile.com>
Subject: Re: [PATCH 10/24] rcu/tree: add rcutree.rcu_min_cached_objs
 description

On Tue, Apr 28, 2020 at 10:58:49PM +0200, Uladzislau Rezki (Sony) wrote:
> Document the rcutree.rcu_min_cached_objs sysfs kernel parameter.
> 
> Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>

Could you please combine this wtih the patch that created this sysfs
parameter?

							Thanx, Paul

> ---
>  Documentation/admin-guide/kernel-parameters.txt | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 828ff975fbc6..b2b7022374af 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -3977,6 +3977,14 @@
>  			latencies, which will choose a value aligned
>  			with the appropriate hardware boundaries.
>  
> +	rcutree.rcu_min_cached_objs= [KNL]
> +			Minimum number of objects which are cached and
> +			maintained per one CPU. Object size is equal
> +			to PAGE_SIZE. The cache allows to reduce the
> +			pressure to page allocator, also it makes the
> +			whole algorithm to behave better in low memory
> +			condition.
> +
>  	rcutree.jiffies_till_first_fqs= [KNL]
>  			Set delay from grace-period initialization to
>  			first attempt to force quiescent states.
> -- 
> 2.20.1
>