linux-kernel - Re: [PATCH v9 0/6] optimize memblock_next_valid_pfn and early_pfn

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Message-ID: <20180703072835.GE16767@dhcp22.suse.cz>
Date:   Tue, 3 Jul 2018 09:28:35 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Jia He <hejianet@...il.com>
Cc:     Russell King <linux@...linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Mel Gorman <mgorman@...e.de>,
        Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Pavel Tatashin <pasha.tatashin@...cle.com>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        AKASHI Takahiro <takahiro.akashi@...aro.org>,
        Gioh Kim <gi-oh.kim@...fitbricks.com>,
        Steven Sistare <steven.sistare@...cle.com>,
        Daniel Vacek <neelx@...hat.com>,
        Eugeniu Rosca <erosca@...adit-jv.com>,
        Vlastimil Babka <vbabka@...e.cz>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, James Morse <james.morse@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Steve Capper <steve.capper@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Kemi Wang <kemi.wang@...el.com>,
        Petr Tesarik <ptesarik@...e.com>,
        YASUAKI ISHIMATSU <yasu.isimatu@...il.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Nikolay Borisov <nborisov@...e.com>, richard.weiyang@...il.com
Subject: Re: [PATCH v9 0/6] optimize memblock_next_valid_pfn and
 early_pfn_valid on arm and arm64

On Tue 03-07-18 10:11:11, Jia He wrote:
> On 7/2/2018 7:40 PM, Michal Hocko Wrote:
[...]
> > So this is 13ms saving when booting 96G machine. Is this really worth
> > the additional code? Are there any other benefits?
> Sorry, Michal
> I missed one thing.
> This 13ms optimization is merely the result of my patch 3~6
> Patch 1 is originated by Paul Burton in commit b92df1de5d289.
> In its description,
> ===
> James said "I have tested this patch on a virtual model of a Samurai CPU
>     with a sparse memory map.  The kernel boot time drops from 109 to
>     62 seconds. "
> ===

Those numbers should be in the changelog.
-- 
Michal Hocko
SUSE Labs