linux-kernel - Re: [PATCH v8 0/6] optimize memblock_next_valid_pfn and early_pfn

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Message-ID: <CACjP9X950MTY9qZ7OkzEaph3U1BL8Vo9sT4jBZ8HTuhHez9JAw@mail.gmail.com>
Date:   Fri, 4 May 2018 20:33:56 +0200
From:   Daniel Vacek <neelx@...hat.com>
To:     Pavel Tatashin <pasha.tatashin@...cle.com>
Cc:     Jia He <hejianet@...il.com>, Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Wei Yang <richard.weiyang@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Laura Abbott <labbott@...hat.com>,
        Vladimir Murzin <vladimir.murzin@....com>,
        Philip Derrin <philip@....systems>,
        AKASHI Takahiro <takahiro.akashi@...aro.org>,
        James Morse <james.morse@....com>,
        Steve Capper <steve.capper@....com>,
        Gioh Kim <gi-oh.kim@...fitbricks.com>,
        Vlastimil Babka <vbabka@...e.cz>, Mel Gorman <mgorman@...e.de>,
        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>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        Eugeniu Rosca <erosca@...adit-jv.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>
Subject: Re: [PATCH v8 0/6] optimize memblock_next_valid_pfn and
 early_pfn_valid on arm and arm64

On Fri, May 4, 2018 at 6:53 PM, Pavel Tatashin
<pasha.tatashin@...cle.com> wrote:
>> I'm wondering, ain't simple enabling of config
>> DEFERRED_STRUCT_PAGE_INIT provide even better speed-up? If that is the
>> case then it seems like this series is not needed at all, right?
>> I am not sure why is this config optional. It looks like it could be
>> enabled by default or even unconditionally considering that with
>> commit c9e97a1997fb ("mm: initialize pages on demand during boot") the
>> deferred code is statically disabled after all the pages are
>> initialized.
>
> Hi Daniel,
>
> Currently, deferred struct pages are initialized in parallel only on NUMA machines. I would like to make a change to use all the available CPUs even on a single socket systems, but that is not there yet. So, I believe Jia's performance improvements are still relevant.

Ahaa, I thought it also works on UP or single node systems. I didn't
study the code closely. Sorry about the noise. And thank you, Pavel.
You're right.

--nX

> Thank you,
> Pavel