linux-kernel - Re: [PATCH 00/14] MIPS: memblock: Switch arch code to NO

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Date:   Thu, 25 Jan 2018 18:58:07 +0100
From:   Alexander Sverdlin <alexander.sverdlin@...ia.com>
To:     Serge Semin <fancer.lancer@...il.com>
CC:     <ralf@...ux-mips.org>, <miodrag.dinic@...s.com>,
        <jhogan@...nel.org>, <goran.ferenc@...s.com>,
        <david.daney@...ium.com>, <paul.gortmaker@...driver.com>,
        <paul.burton@...s.com>, <alex.belits@...ium.com>,
        <Steven.Hill@...ium.com>, <matt.redfearn@...s.com>,
        <kumba@...too.org>, <marcin.nowakowski@...s.com>,
        <James.hogan@...s.com>, <Peter.Wotton@...s.com>,
        <Sergey.Semin@...latforms.ru>, <linux-mips@...ux-mips.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/14] MIPS: memblock: Switch arch code to NO_BOOTMEM

Hello Serge,

On 17/01/18 23:22, Serge Semin wrote:
> The patchset is applied on top of kernel 4.15-rc8 and can be found
> submitted at my repo:
> https://github.com/fancer/Linux-kernel-MIPS-memblock-project

I've tested the Linux from your repo on Octeon2 and it looks good to me.
I've only tested startup though. Therefore,

Tested-by: Alexander Sverdlin <alexander.sverdlin@...ia.com>

I've noticed one positive effect I cannot explain -- with almost the same
physical memory map I observe almost 2 megabytes more available memory
after startup:

without patches:

root@(none):~ >free
              total        used        free      shared  buff/cache   available
Mem:         955040       16264      839948       80068       98828      810068
Swap:             0           0           0

memory map:

memory: 0000000001090dc0 @ 0000000009000000 (usable after init)
memory: 0000000005400000 @ 0000000002b00000 (usable)
memory: 0000000000c00000 @ 0000000008200000 (usable)
memory: 0000000004800000 @ 000000000a100000 (usable)
memory: 000000001fc00000 @ 0000000020000000 (usable)
memory: 0000000010000000 @ 0000000040000000 (usable)
memory: 000000000190a9d0 @ 0000000001100000 (usable)

----------------------------------------

with patches:

root@(none):~ >free
              total        used        free      shared  buff/cache   available
Mem:         955028       14292      841884       80068       98852      811996
Swap:             0           0           0

memory map:

memory: 0000000001090e00 @ 0000000009000000 (usable after init)
memory: 0000000005400000 @ 0000000002b00000 (usable)
memory: 0000000000c00000 @ 0000000008200000 (usable)
memory: 0000000004800000 @ 000000000a100000 (usable)
memory: 000000001fc00000 @ 0000000020000000 (usable)
memory: 0000000010000000 @ 0000000040000000 (usable)
memory: 000000000190c9d0 @ 0000000001100000 (usable)


> Signed-off-by: Serge Semin <fancer.lancer@...il.com>
> 
> Serge Semin (14):
>   MIPS: memblock: Add RESERVED_NOMAP memory flag
>   MIPS: memblock: Surely map BSS kernel memory section
>   MIPS: memblock: Reserve initrd memory in memblock
>   MIPS: memblock: Discard bootmem initialization
>   MIPS: memblock: Add reserved memory regions to memblock
>   MIPS: memblock: Reserve kdump/crash regions in memblock
>   MIPS: memblock: Mark present sparsemem sections
>   MIPS: memblock: Simplify DMA contiguous reservation
>   MIPS: memblock: Allow memblock regions resize
>   MIPS: memblock: Perform early low memory test
>   MIPS: memblock: Print out kernel virtual mem layout
>   MIPS: memblock: Discard bootmem from Loongson3 code
>   MIPS: memblock: Discard bootmem from SGI IP27 code
>   MIPS: memblock: Deactivate bootmem allocator

-- 
Best regards,
Alexander Sverdlin.