linux-kernel - Re: [PATCH v2 0/6] perf: Introduce extended syscall error reporting

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Message-ID: <1440572775.1932.1.camel@sipsolutions.net>
Date:	Wed, 26 Aug 2015 09:06:15 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>, adrian.hunter@...el.com,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Vince Weaver <vince@...ter.net>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v2 0/6] perf: Introduce extended syscall error reporting

On Tue, 2015-08-25 at 22:07 -0700, Linus Torvalds wrote:

> > No, the current MAX_ERRNO is probably not big enough if this scheme is successful,
> > and I don't see any reason why it wouldn't be successful: I think this feature
> > would be the biggest usability feature added to Linux system calls and to Linux
> > system tooling in the last 10 years or so.
> Don't be silly. It's a horrible idea. People would want to 
> internationalize the strings etc, and nobody would use the extended 
> versions anyway, since nobody uses raw system calls.

That's a good point, and think that least in the netlink case it'd be
much better to say which attribute was the one that had an issue, and
that has an obvious binary encoding rather than encoding that in a
string.

Perhaps that's something I can play with separately.

johannes
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