linux-kernel - Re: [rfc][patch] dynamic resizing dentry hash using RCU

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Date:	Sat, 24 Feb 2007 13:07:23 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Nick Piggin <npiggin@...e.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [rfc][patch] dynamic resizing dentry hash using RCU

On Fri, 23 Feb 2007 16:37:43 +0100
Nick Piggin <npiggin@...e.de> wrote:

> +static void dcache_hash_resize(unsigned int new_shift);
> +static void mod_nr_dentry(int mod)
> +{
> +	unsigned long dentry_size;
> +
> +	dentry_stat.nr_dentry += mod;
> +
> +	dentry_size = 1 << dentry_hash->shift;
> +	if (unlikely(dentry_stat.nr_dentry > dentry_size+(dentry_size>>1)))
> +		dcache_hash_resize(dentry_hash->shift+1);
> +	else if (unlikely(dentry_stat.nr_dentry < (dentry_size>>1)))
> +		dcache_hash_resize(dentry_hash->shift-1);
> +}
> +

Do we need to do this kind of resizing in implicit automatic way ?
I think it's good to show contention rate by /proc and add sysctl for
resize this.

-Kame

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