linux-kernel - Re: seq_put_decimal

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Message-ID: <CACVxJT9t7iNnUfVcDf=vyO7Nzhey0QaDgjpqkPBFYmc7FCPZyQ@mail.gmail.com>
Date:	Mon, 19 Mar 2012 14:53:17 +0200
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: seq_put_decimal_ull() et al

On Mon, Mar 19, 2012 at 3:29 AM, KAMEZAWA Hiroyuki
<kamezawa.hiroyu@...fujitsu.com> wrote:
> (2012/03/16 20:16), Alexey Dobriyan wrote:
>
>> On Wed, Mar 14, 2012 at 5:08 AM, KAMEZAWA Hiroyuki
>> <kamezawa.hiroyu@...fujitsu.com> wrote:
>>> On Wed, 14 Mar 2012 09:31:56 +0900
>>> KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:
>>>
>>>> On Tue, 13 Mar 2012 15:35:54 +0200
>>>> Alexey Dobriyan <adobriyan@...il.com> wrote:
>>>>
>>>>>> Subject:    + procfs-add-num_to_str-to-speed-up-proc-stat-fix-2.patch added to -mm tree
>>>>>
>>>>> I think the fix is to create proper binary interface for exporting
>>>>> interrupt counts.
>>>>> Programs can parse raw data equally well if programming language is
>>>>> even minimally reasonable
>>>>> (POSIX shell may not qualify, though).
>>>>
>>>> Ok, please try with all tool-chain updates.
>>>> procps, top, sar, and more ?
>>>>
>>
>> Well, why not?
>> We can tune print code or we can create maximally fast interface and forget.
>>
>
> Do you have an idea where to place it ?
> /proc/stat_binary ?
> /proc/binary/stat ?
>
> Hm, to parse /proc/stat binary format, the user has to know the format of the
> kernel version.
>
> Do we show a format file as
> /proc/binary/stat_format and show
> # cat /proc/binary/stat_format
>  =IHHHIHIQQQIHQQ...
>
> as python's pack/unpack ? or
> export the format via /usr/include/linux/proc_format.h ? as a structure ?
>
> any better idea ?

I'm thinking of separate file with interrupts statistics. Let's not
mix everything.
Hmm, let me see how top(1) parses /proc/interrupts.
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