From: Stephen Boyd <sboyd@codeaurora.org>
To: Sylwester Nawrocki <s.nawrocki@samsung.com>
Cc: Chanwoo Choi <cw00.choi@samsung.com>,
tomasz.figa@gmail.com, mturquette@baylibre.com, kgene@kernel.org,
k.kozlowski@samsung.com, chanwoo@kernel.org,
linux-samsung-soc@vger.kernel.org, linux-clk@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] clk: samsung: exynos5260: Move struct samsung_cmu_info to init section
Date: Tue, 23 Aug 2016 21:43:46 -0700 [thread overview]
Message-ID: <20160824044346.GR6502@codeaurora.org> (raw)
In-Reply-To: <84e40b9b-1e08-24e0-f1ef-60b38b760ae6@samsung.com>
On 08/23, Sylwester Nawrocki wrote:
> On 08/23/2016 04:35 AM, Chanwoo Choi wrote:
> I checked stripped object files and it seems with the patch there
> is some saving of the kernel image size. Exactly 784 bytes, which
> makes zImage smaller by 480 bytes.
>
> The patch increases .init.rodata section size by 780 bytes but
> decreases .init.text section size by 1564 bytes. Looks like
> a static initializer is cheaper.
>
> $ ls -l drivers/clk/samsung/clk-exynos5260.o
>
> < -rw-rw-r-- 1 snawrocki snawrocki 29100 Aug 23 11:35 drivers/clk/samsung/clk-exynos5260.o
> ---
> > -rw-rw-r-- 1 snawrocki snawrocki 28316 Aug 23 11:32 drivers/clk/samsung/clk-exynos5260.o
>
>
> The section size differences are as below:
> 15c15
> < 3 .init.text 000006b8 00000000 00000000 00000034 2**2
> ---
> > 3 .init.text 0000009c 00000000 00000000 00000034 2**2
> 25c25
> < 8 .init.rodata 00003f6c 00000000 00000000 00002f20 2**2
> ---
> > 8 .init.rodata 00004278 00000000 00000000 00002904 2**2
>
> So the saving is rather insignificant but the patch doesn't make
> things worse and I'd say it might be worth applying.
>
Sounds good. This sort of information should be in the commit
text though. Talking about const doesn't make any sense to me.
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project
next prev parent reply other threads:[~2016-08-24 4:43 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-22 2:49 [PATCH 0/2] clk: samsung: Move struct samsung_cmu_info to init section Chanwoo Choi
2016-08-22 2:49 ` [PATCH 1/2] clk: samsung: exynos5260: " Chanwoo Choi
2016-08-23 0:55 ` Stephen Boyd
2016-08-23 2:35 ` Chanwoo Choi
2016-08-23 10:07 ` Sylwester Nawrocki
2016-08-24 4:43 ` Stephen Boyd [this message]
2016-08-24 8:38 ` Chanwoo Choi
2016-08-25 0:11 ` Stephen Boyd
2016-08-25 7:28 ` Chanwoo Choi
2016-08-25 14:43 ` Tomasz Figa
2016-09-01 17:06 ` Sylwester Nawrocki
2016-08-22 2:49 ` [PATCH 2/2] clk: samsung: exynos5410: Use samsung_cmu_register_one() to simplify code Chanwoo Choi
2016-09-01 17:07 ` Sylwester Nawrocki
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