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Date:   Tue, 13 Feb 2018 17:00:50 -0800 (PST)
From:   David Rientjes <rientjes@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Mike Kravetz <mike.kravetz@...cle.com>
cc:     Jonathan Corbet <corbet@....net>, Vlastimil Babka <vbabka@...e.cz>,
        Mel Gorman <mgorman@...e.de>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-doc@...r.kernel.org
Subject: [patch -mm] mm, page_alloc: extend kernelcore and movablecore for
 percent fix

Specify that movablecore= can use a percent value.

Remove comment about hugetlb pages not being movable per Mike.

Cc: Mike Kravetz <mike.kravetz@...cle.com>
Signed-off-by: David Rientjes <rientjes@...gle.com>
---
 .../admin-guide/kernel-parameters.txt         | 22 +++++++++----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -1837,10 +1837,9 @@
 
 			ZONE_MOVABLE is used for the allocation of pages that
 			may be reclaimed or moved by the page migration
-			subsystem.  This means that HugeTLB pages may not be
-			allocated from this zone.  Note that allocations like
-			PTEs-from-HighMem still use the HighMem zone if it
-			exists, and the Normal zone if it does not.
+			subsystem.  Note that allocations like PTEs-from-HighMem
+			still use the HighMem zone if it exists, and the Normal
+			zone if it does not.
 
 			It is possible to specify the exact amount of memory in
 			the form of "nn[KMGTPE]", a percentage of total system
@@ -2353,13 +2352,14 @@
 	mousedev.yres=	[MOUSE] Vertical screen resolution, used for devices
 			reporting absolute coordinates, such as tablets
 
-	movablecore=nn[KMG]	[KNL,X86,IA-64,PPC] This parameter
-			is similar to kernelcore except it specifies the
-			amount of memory used for migratable allocations.
-			If both kernelcore and movablecore is specified,
-			then kernelcore will be at *least* the specified
-			value but may be more. If movablecore on its own
-			is specified, the administrator must be careful
+	movablecore=	[KNL,X86,IA-64,PPC]
+			Format: nn[KMGTPE] | nn%
+			This parameter is the complement to kernelcore=, it
+			specifies the amount of memory used for migratable
+			allocations.  If both kernelcore and movablecore is
+			specified, then kernelcore will be at *least* the
+			specified value but may be more.  If movablecore on its
+			own is specified, the administrator must be careful
 			that the amount of memory usable for all allocations
 			is not too small.
 

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