linux-kernel - Re: [ProbableSpam] Re: [RFC, PATCH 0/5] Going forward with Resource Management

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Message-ID: <44D765E3.9040206@sw.ru>
Date:	Mon, 07 Aug 2006 20:10:11 +0400
From:	Kirill Korotaev <dev@...ru>
To:	Paul Jackson <pj@....com>
CC:	nagar@...son.ibm.com, akpm@...l.org, vatsa@...ibm.com,
	mingo@...e.hu, nickpiggin@...oo.com.au, sam@...ain.net,
	linux-kernel@...r.kernel.org, dev@...nvz.org, efault@....de,
	balbir@...ibm.com, sekharan@...ibm.com, haveblue@...ibm.com
Subject: Re: [ProbableSpam] Re: [RFC, PATCH 0/5] Going forward with Resource
 Management - A cpu  controller

>>>A filesystem based interface is useful when you have hierarchies (as resource
>>>groups and cpusets do) since it naturally defines a convenient to use
>>>hierarchical namespace.
>>
>>but it is not much convinient for applications then.
> 
> 
> Is this simply a language issue?  File systems hierarchies
> are more easily manipulated with shell utilities (ls, cat,
> find, grep, ...) and system call API's are easier to access
> from C?
> 
> If so, then perhaps all that's lacking for convenient C access
> to a filesystem based interface is a good library, that presents
> an API convenient for use from C code, but underneath makes the
> necessary file system calls (open, read, diropen, stat, ...).

IMHO:
file system APIs are not good for accessing attributed data.
e.g. we have a /proc which is very convenient for use from shell etc. but
is not good for applications, not fast enough etc.
moreover, /proc had always problems with locking, races and people tend to
feel like they can change text presention of data, while applications parsing
it tend to break.

Kirill
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