linux-kernel - Re: [RFC PATCH 1/5] x86/Kconfig: Add Page Cache Accounting entry

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Date:	Wed, 2 Mar 2011 08:24:12 -0800
From:	Randy Dunlap <rdunlap@...otime.net>
To:	Liu Yuan <namei.unix@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	jaxboe@...ionio.com, akpm@...ux-foundation.org,
	fengguang.wu@...el.com
Subject: Re: [RFC PATCH 1/5] x86/Kconfig: Add Page Cache Accounting entry

On Wed,  2 Mar 2011 16:38:06 +0800 Liu Yuan wrote:

> From: Liu Yuan <tailai.ly@...bao.com>
> 
> Signed-off-by: Liu Yuan <tailai.ly@...bao.com>
> ---
>  arch/x86/Kconfig.debug |    9 +++++++++
>  1 files changed, 9 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
> index 615e188..f29e32d 100644
> --- a/arch/x86/Kconfig.debug
> +++ b/arch/x86/Kconfig.debug
> @@ -304,4 +304,13 @@ config DEBUG_STRICT_USER_COPY_CHECKS
>  
>  	  If unsure, or if you run an older (pre 4.4) gcc, say N.
>  
> +config PAGE_CACHE_ACCT
> +	bool "Page cache accounting"
> +	---help---
> +	  Enabling this options to account for page cache hit/missed number of
> +	  times. This would allow user space applications get better knowledge
> +	  of underlying page cache system by reading virtual file. The statitics
> +	  per partition are collected.
> +
> +	  If unsure, say N.
>  endmenu
> -- 

rewrite:

	  Enable this option to provide for page cache hit/miss counters.
	  This allows userspace applications to obtain better knowledge of the
	  underlying page cache subsystem by reading a virtual file.
	  Statistics are collect per partition.

questions:
	what virtual file?
	what kind of partition?

---
~Randy
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