linux-kernel - Re: [PATCH 1/2] Revert "x86/e820: put !E820_TYPE

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Date:   Mon, 27 Aug 2018 23:18:42 +0000
From:   Pasha Tatashin <Pavel.Tatashin@...rosoft.com>
To:     Masayoshi Mizuma <msys.mizuma@...il.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>
CC:     Masayoshi Mizuma <m.mizuma@...fujitsu.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH 1/2] Revert "x86/e820: put !E820_TYPE_RAM regions into
 memblock.reserved"

On 8/23/18 2:25 PM, Masayoshi Mizuma wrote:
> From: Masayoshi Mizuma <m.mizuma@...fujitsu.com>
> 
> commit 124049decbb1 ("x86/e820: put !E820_TYPE_RAM regions into
> memblock.reserved") breaks movable_node kernel option because it
> changed the memory gap range to reserved memblock. So, the node
> is marked as Normal zone even if the SRAT has Hot plaggable affinity.
> 
>     =====================================================================
>     kernel: BIOS-e820: [mem 0x0000180000000000-0x0000180fffffffff] usable
>     kernel: BIOS-e820: [mem 0x00001c0000000000-0x00001c0fffffffff] usable
>     ...
>     kernel: reserved[0x12]#011[0x0000181000000000-0x00001bffffffffff], 0x000003f000000000 bytes flags: 0x0
>     ...
>     kernel: ACPI: SRAT: Node 2 PXM 6 [mem 0x180000000000-0x1bffffffffff] hotplug
>     kernel: ACPI: SRAT: Node 3 PXM 7 [mem 0x1c0000000000-0x1fffffffffff] hotplug
>     ...
>     kernel: Movable zone start for each node
>     kernel:  Node 3: 0x00001c0000000000
>     kernel: Early memory node ranges
>     ...
>     =====================================================================
> 
> Naoya's v1 patch [*] fixes the original issue and this movable_node
> issue doesn't occur.
> Let's revert commit 124049decbb1 ("x86/e820: put !E820_TYPE_RAM
> regions into memblock.reserved") and apply the v1 patch.
> 
> [*] https://lkml.org/lkml/2018/6/13/27
> 
> Signed-off-by: Masayoshi Mizuma <m.mizuma@...fujitsu.com>

Reviewed-by: Pavel Tatashin <pavel.tatashin@...rosoft.com>