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From: Ingo Molnar <mingo@kernel.org>
To: Alexander Kuleshov <kuleshovmail@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	"H . Peter Anvin" <hpa@zytor.com>,
	Andrey Ryabinin <ryabinin.a.a@gmail.com>,
	Andy Lutomirski <luto@kernel.org>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Alexander Popov <alpopov@ptsecurity.com>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] x86/head64: micro optimization: use memset instead of for loop
Date: Tue, 9 Feb 2016 14:18:38 +0100	[thread overview]
Message-ID: <20160209131838.GA22486@gmail.com> (raw)
In-Reply-To: <1455023517-7620-1-git-send-email-kuleshovmail@gmail.com>


* Alexander Kuleshov <kuleshovmail@gmail.com> wrote:

> This patch simplifies clearing of page table directories, by
> the using of the fast memset() from the arch/x86/lib/memset_64.S.
> Besides this, we 25 bytes is 25 bytes less than original.
> 
> text       data     bss              dec            hex filename
> 
> 9735144 4970776 15474688        30180608        1cc8500 vmlinux.old
> 9735119 4970776 15474688        30180583        1cc84e7 vmlinux
> 
> Signed-off-by: Alexander Kuleshov <kuleshovmail@gmail.com>
> ---
> Changelog:
> 
> v2: We got sizeof pud_p/pmd_p in the v1, but actually we need
> to take sizeof of pud_p/pmd_p pointer, although their sizes are
> the same.

Please send a delta patch (with changelog) as the v1 commit is already deep within 
the tip:x86/boot branch.

Thanks,

	Ingo

      reply	other threads:[~2016-02-09 13:18 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-01-30  8:01 [PATCH] x86/head64: micro optimization: use memset instead of for loop Alexander Kuleshov
2016-01-30  8:26 ` [tip:x86/boot] x86/boot: Micro-optimize reset_early_page_tables() tip-bot for Alexander Kuleshov
2016-02-05  0:25   ` Yinghai Lu
2016-02-09 12:28     ` Ingo Molnar
2016-02-09 13:11       ` [PATCH v2] x86/head64: micro optimization: use memset instead of for loop Alexander Kuleshov
2016-02-09 13:18         ` Ingo Molnar [this message]

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