linux-kernel - Re: [PATCH] ksm: Expose configuration via sysctl

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Message-ID: <530D3102.60504@intel.com>
Date:	Tue, 25 Feb 2014 16:10:42 -0800
From:	Dave Hansen <dave.hansen@...el.com>
To:	Alexander Graf <agraf@...e.de>
CC:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Hugh Dickins <hughd@...gle.com>,
	Izik Eidus <izik.eidus@...ellosystems.com>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [PATCH] ksm: Expose configuration via sysctl

On 02/25/2014 03:09 PM, Alexander Graf wrote:
>> Couldn't we also (maybe in parallel) just teach the sysctl userspace
>> about sysfs?  This way we don't have to do parallel sysctls and sysfs
>> for *EVERYTHING* in the kernel:
>>
>>    sysfs.kernel.mm.transparent_hugepage.enabled=enabled
> 
> It's pretty hard to filter this. We definitely do not want to expose all of sysfs through /proc/sys. But how do we know which files are actual configuration and which ones are dynamic system introspection data?
> 
> We could add a filter, but then we can just as well stick with the manual approach I followed here :).

Maybe not stick it under /proc/sys, but teach sysctl(8) about them.  I
guess at the moment, sysctl says that it's tied to /proc/sys:

> DESCRIPTION
>        sysctl  is  used to modify kernel parameters at runtime.  The parameters available are those listed under /proc/sys/.  Procfs is required
>        for sysctl support in Linux.  You can use sysctl to both read and write sysctl data.

But surely that's not set in stone just because the manpage says so. :)
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