linux-kernel - Re: [GIT PULL] kdbus for 4.1-rc1

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Message-ID: <CA+55aFzrzrJMuqdBB5=B8wG7eWtFDvViEEBG9xbC10pwyCio8A@mail.gmail.com>
Date:	Wed, 15 Apr 2015 11:18:45 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Jiri Kosina <jkosina@...e.cz>,
	Al Viro <viro@...iv.linux.org.uk>,
	Borislav Petkov <bp@...en8.de>,
	Andy Lutomirski <luto@...capital.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Tom Gundersen <teg@...m.no>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Daniel Mack <daniel@...que.org>,
	David Herrmann <dh.herrmann@...il.com>,
	Djalal Harouni <tixxdz@...ndz.org>
Subject: Re: [GIT PULL] kdbus for 4.1-rc1

On Wed, Apr 15, 2015 at 11:11 AM, Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
> On Wed, Apr 15, 2015 at 01:33:27PM -0400, Steven Rostedt wrote:
>>
>> I'll argue that you can't fix the later one. One thing that I've observed over
>> the years of having faster computers is, as soon as you make it faster, people
>> will write slower software.
>>
>> Currently the issue is that we have thousands of dbus queries, you make dbus
>> 10x faster, I guarantee that people will write software with 10 thousand dbus
>> queries and we are no better off than we are today.
>
> Then they get to buy a faster machine :)

Is there actually a performance issue?

I've seen this claimed, but I have never seen any actual numbers. What
speeds up? By how much? is it actually measurable?

Maybe they've marched past me in this thread-from-hell. But I can't
recall having seen any (not now, not before).

That said, I think the more serious issue is that if Luto complains
about the capability-capturing code being completely broken, then
people need to take that *seriously*.

                    Linus
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