linux-kernel - Re: [PATCH v3 1/5] docs: kernel-parameters: Update to reflect the current default size of atomic pool

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Message-ID: <05c0da33-f225-41a4-4310-9cc9b3348275@oracle.com>
Date:   Mon, 13 Dec 2021 08:20:35 -0600
From:   john.p.donnelly@...cle.com
To:     Baoquan He <bhe@...hat.com>, linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, akpm@...ux-foundation.org, hch@....de,
        cl@...ux.com, John.p.donnelly@...cle.com, kexec@...ts.infradead.org
Subject: Re: [PATCH v3 1/5] docs: kernel-parameters: Update to reflect the
 current default size of atomic pool

On 12/13/21 6:27 AM, Baoquan He wrote:
> Since commit 1d659236fb43("dma-pool: scale the default DMA coherent pool
> size with memory capacity"), the default size of atomic pool has been
> changed to take by scaling with system memory capacity. So update the
> document in kerenl-parameter.txt accordingly.
> 
> Signed-off-by: Baoquan He <bhe@...hat.com>
 >
  Acked-by: John Donnelly <john.p.donnelly@...cle.com>
  Tested-by:  John Donnelly <john.p.donnelly@...cle.com>

> ---
>   Documentation/admin-guide/kernel-parameters.txt | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 9725c546a0d4..ec4d25e854a8 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -664,7 +664,9 @@
>   
>   	coherent_pool=nn[KMG]	[ARM,KNL]
>   			Sets the size of memory pool for coherent, atomic dma
> -			allocations, by default set to 256K.
> +			allocations. Otherwise the default size will be scaled
> +			with memory capacity, while clamped between 128K and
> +			1 << (PAGE_SHIFT + MAX_ORDER-1).
>   
>   	com20020=	[HW,NET] ARCnet - COM20020 chipset
>   			Format: