linux-kernel - Re: [RESEND PATCH v10 3/6] mm: page_alloc: reduce unnecessary binary search in memblock_next_valid

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Message-ID: <91823321-6d66-4b05-e5be-21d024d83854@microsoft.com>
Date:   Fri, 17 Aug 2018 01:22:28 +0000
From:   Pasha Tatashin <Pavel.Tatashin@...rosoft.com>
To:     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>
CC:     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>,
        Pasha Tatashin <Pavel.Tatashin@...rosoft.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>,
        Daniel Vacek <neelx@...hat.com>,
        Eugeniu Rosca <erosca@...adit-jv.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Jia He <jia.he@...-semitech.com>
Subject: Re: [RESEND PATCH v10 3/6] mm: page_alloc: reduce unnecessary binary
 search in memblock_next_valid_pfn()



On 8/16/18 9:08 PM, Pavel Tatashin wrote:
> 
>> Signed-off-by: Jia He <jia.he@...-semitech.com>
>> ---
>>  mm/memblock.c | 37 +++++++++++++++++++++++++++++--------
>>  1 file changed, 29 insertions(+), 8 deletions(-)
>>
>> diff --git a/mm/memblock.c b/mm/memblock.c
>> index ccad225..84f7fa7 100644
>> --- a/mm/memblock.c
>> +++ b/mm/memblock.c
>> @@ -1140,31 +1140,52 @@ int __init_memblock memblock_set_node(phys_addr_t base, phys_addr_t size,
>>  #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
>>  
>>  #ifdef CONFIG_HAVE_MEMBLOCK_PFN_VALID
>> +static int early_region_idx __init_memblock = -1;
> 
> One comment:
> 
> This should be __initdata, but even better bring it inside the function
> as local static variable.

Disregard this comment, this global is used in the next commits. So,
everything is OK. No need for __initdata either.

> 
>>  ulong __init_memblock memblock_next_valid_pfn(ulong pfn)
>>  {
> 
> Otherwise looks good:
> 
> Reviewed-by: Pavel Tatashin <pavel.tatashin@...rosoft.com>
> 
>