linux-kernel - Re: taskstats root only breaking iotop

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Message-ID: <CA+55aFyci1PB9Y_BSqWnQKSSfcCrbJud+q1Z8Cdquo7hXJZaMw@mail.gmail.com>
Date:	Sat, 1 Oct 2011 17:20:58 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Guillaume Chazarain <guichaz@...il.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Balbir Singh <bsingharora@...il.com>,
	Vasiliy Kulikov <segoon@...nwall.com>
Subject: Re: taskstats root only breaking iotop

On Sat, Oct 1, 2011 at 3:41 PM, Guillaume Chazarain <guichaz@...il.com> wrote:
> On Sat, Oct 1, 2011 at 11:59 PM, Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
>> I think the question should be: why is it *ever* a good idea to let
>> *anybody* read how many bytes anybody has read.
>
> I use iotop to get the throughput of a cp or tar because I don't
> always think of piping to 'pv'. People also use it as a progress
> indicator for their less verbose applications (total bytes
> read/written instead of rate).

I can understand the use of "throughput".

I don't understand why you then even *mention* byte-granularity. NOBODY CARES.

It really is that simple. Either you care about a single process (and
you damn well use strace or something similar), or you care about
"statistics".

For the statistics, something *like* TASKSTATS can make sense, but
never *ever* does it make sense to give byte-granularity stats in that
case.

So I don't see why you ask for it. What could possibly be a valid use-case?

                         Linus
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