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

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Message-ID: <DA9A1AB1-A351-4637-A29F-F290A3C748F6@zytor.com>
Date:	Wed, 20 Jan 2016 06:46:15 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Steven Rostedt <rostedt@...dmis.org>,
	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>, 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 January 20, 2016 6:40:35 AM PST, Steven Rostedt <rostedt@...dmis.org> wrote:
>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

Also, looking at vmlinux.o for size is bogus - most of that is debugging information.
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