linux-kernel - Re: x86_64 Compiler Output Kernel Bloat v4.4

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Message-ID: <20160120094035.4e63f473@gandalf.local.home>
Date:	Wed, 20 Jan 2016 09:40:35 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Jeff Merkey <linux.mdb@...il.com>
Cc:	Jiri Olsa <jolsa@...hat.com>, LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andy Lutomirski <luto@...capital.net>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, X86 ML <x86@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andy Lutomirski <luto@...nel.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Borislav Petkov <bp@...en8.de>, Jiri Olsa <jolsa@...nel.org>
Subject: Re: x86_64 Compiler Output Kernel Bloat v4.4

On Tue, 19 Jan 2016 08:47:04 -0700
Jeff Merkey <linux.mdb@...il.com> wrote:


> I'll check my CONFIG and see if there's a way to turn this off.
> vmlinux.o is at 385MB on my build -- about 20% of that is this NOP
> instruction for a trace program that in most cases is probably never
> used.  Oink ... Oink ... Oink ...
>

The bloat is well known and was a sacrifice for the feature. This
feature is optional. If you don't like it, simple disable all tracing.
Then you'll save a lot of kernel text.

-- Steve