linux-kernel - Re: kdbus: to merge or not to merge?

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Message-ID: <CA+55aFzL93Vqa=a8eckOSReB_L4rX52v_7kcFNRFjkyA_fmd4w@mail.gmail.com>
Date:	Tue, 4 Aug 2015 06:46:03 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	David Herrmann <dh.herrmann@...il.com>
Cc:	Andy Lutomirski <luto@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Djalal Harouni <tixxdz@...ndz.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Havoc Pennington <havoc.pennington@...il.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Tom Gundersen <teg@...m.no>, Daniel Mack <daniel@...que.org>,
	"Kalle A. Sandstrom" <ksandstr@....fi>,
	Borislav Petkov <bp@...en8.de>, cee1 <fykcee1@...il.com>
Subject: Re: kdbus: to merge or not to merge?

On Tue, Aug 4, 2015 at 1:58 AM, David Herrmann <dh.herrmann@...il.com> wrote:
>
> You lack a call to sd_bus_unref() here.

I assume it was intentional. Why would Andy talk about "scaling" otherwise?

And the worry was why the kdbus version killed the machine, but the
userspace version did not. That's a rather big difference, and not a
good one.

Possibly the kdbus version ends up not just allocating user space
memory (which we should handle gracefully), but kernel allocations too
(which absolutely have to be explicitly resource-managed).

               Linus
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