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Date: Thu, 14 May 2015 21:04:36 +0200
From: Denys Vlasenko <dvlasenk@redhat.com>
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To: Ingo Molnar <mingo@kernel.org>
CC: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Jason Low <jason.low2@hp.com>, Peter Zijlstra <peterz@infradead.org>,
        Davidlohr Bueso <dave@stgolabs.net>,
        Tim Chen <tim.c.chen@linux.intel.com>,
        Aswin Chandramouleeswaran <aswin@hp.com>,
        LKML <linux-kernel@vger.kernel.org>, Borislav Petkov <bp@alien8.de>,
        Andy Lutomirski <luto@amacapital.net>, Brian Gerst <brgerst@gmail.com>,
        "H. Peter Anvin" <hpa@zytor.com>, Thomas Gleixner <tglx@linutronix.de>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: [PATCH] x86: Align jump targets to 1 byte boundaries
References: <CA+55aFzXMDjQQ7jTjsPdh1RikXfgV7OCd-+13cz06MOmDBA33w@mail.gmail.com> <CA+55aFwZWi6ecDmVsMBQJTrgrW3GD2DaRtpiOspe=5amR1=dNg@mail.gmail.com> <20150409183926.GM6464@linux.vnet.ibm.com> <20150410090051.GA28549@gmail.com> <20150410091252.GA27630@gmail.com> <20150410092152.GA21332@gmail.com> <20150410111427.GA30477@gmail.com> <20150410112748.GB30477@gmail.com> <20150410120846.GA17101@gmail.com> <55548E12.6020207@redhat.com> <20150514181707.GA21728@gmail.com>
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On 05/14/2015 08:17 PM, Ingo Molnar wrote:
> There were also these other changes I tested:
> 
> +        # Reduces vmlinux size by 0.25%:
> +        KBUILD_CFLAGS += -fno-caller-saves
> +
> +        # Reduces vmlinux size by 1.10%:
> +        KBUILD_CFLAGS += -fno-inline-small-functions
> +
> +        # Reduces vmlinux size by about 0.95%:
> +        KBUILD_CFLAGS += -fno-tree-ch
> 
> We could maybe consider -fno-caller-saves. What do you think about 
> that option?

Quick googling din't even find what it does.
It would need a comment :)