linux-kernel - Re: [RFC] arm: add __initbss section attribute

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Message-ID: <8530796.1MzFUDEUSY@wuerfel>
Date:	Mon, 12 Oct 2015 12:21:16 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	yalin wang <yalin.wang2010@...il.com>
Cc:	linux@....linux.org.uk, ard.biesheuvel@...aro.org,
	will.deacon@....com, nico@...aro.org, keescook@...omium.org,
	catalin.marinas@....com, victor.kamensky@...aro.org,
	msalter@...hat.com, vladimir.murzin@....com, ggdavisiv@...il.com,
	paul.gortmaker@...driver.com, mingo@...nel.org,
	rusty@...tcorp.com.au, mcgrof@...e.com, akpm@...ux-foundation.org,
	kirill.shutemov@...ux.intel.com, n-horiguchi@...jp.nec.com,
	aarcange@...hat.com, mhocko@...e.com, jack@...e.cz,
	iamjoonsoo.kim@....com, xiexiuqi@...wei.com, vbabka@...e.cz,
	Vineet.Gupta1@...opsys.com, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [RFC] arm: add __initbss section attribute

On Monday 12 October 2015 11:59:16 yalin wang wrote:
> This attribute can make init data to be into .initbss section,
> this will make the data to be NO_BITS in vmlinux, can shrink the
> Image file size, and speed up the boot up time.
> 
> Signed-off-by: yalin wang <yalin.wang2010@...il.com>

Do you have an estimate of how much it gains?

In multi_v7_defconfig, I see a total of 3367 symbols with
406016 bytes init.data, but only 348 bytes of those are
in zero-initialized symbols.

	Arnd
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