linux-kernel - [RFC PATCH v2 1/5] docs: kernel-parameters: Update to reflect the current default size of atomic pool

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Date:   Tue, 10 Aug 2021 17:48:31 +0800
From:   Baoquan He <bhe@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, akpm@...ux-foundation.org, hch@....de,
        robin.murphy@....com, cl@...ux.com, penberg@...nel.org,
        rientjes@...gle.com, iamjoonsoo.kim@....com, vbabka@...e.cz,
        m.szyprowski@...sung.com, rppt@...ux.ibm.com,
        Baoquan He <bhe@...hat.com>
Subject: [RFC PATCH v2 1/5] docs: kernel-parameters: Update to reflect the current default size of atomic pool

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>
---
 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 bdb22006f713..970ed65db89f 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -653,7 +653,9 @@
 
 	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:
-- 
2.17.2