[PATCH] Add a movablecore= parameter for sizing ZONE_MOVABLE

[mel@skynet.ie (Mel Gorman)]

On (12/07/07 22:32), Mel Gorman didst pronounce:

> > Should we at least go for
> > 
> > add-__gfp_movable-for-callers-to-flag-allocations-from-high-memory-that-may-be-migrated.patch
> > create-the-zone_movable-zone.patch
> > allow-huge-page-allocations-to-use-gfp_high_movable.patch
> > handle-kernelcore=-generic.patch
> > 
> > in 2.6.23?
> 
> Well, yes please from me obviously :) . There is one additional patch
> I would like to send on tomorrow and that is providing the movablecore=

This is the patch. It has been boot-tested on a number of machines and
behaves as expected. Nick, with this in addition, do you have any
objection to the ZONE_MOVABLE patches going through to 2.6.23?

Thanks

=====
This patch adds a new parameter for sizing ZONE_MOVABLE called
movablecore=. While kernelcore= is used to specify the minimum amount of
memory that must be available for all allocation types, movablecore= is
used to specify the minimum amount of memory that is used for migratable
allocations. The amount of memory used for migratable allocations determines
how large the huge page pool could be dynamically resized to at runtime
for example.

How movablecore is actually handled is that the total number of pages in the system is calculated and a value is set for kernelcore that is

kernelcore == totalpages - movablecore

Both kernelcore= and movablecore= can be safely specified at the same time.

Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: Andy Whitcroft <apw@shadowen.org>

---
 Documentation/kernel-parameters.txt |   10 +++++
 mm/page_alloc.c                     |   65 ++++++++++++++++++++++++++++++++----
 2 files changed, 68 insertions(+), 7 deletions(-)
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.22-zonemovable/Documentation/kernel-parameters.txt linux-2.6.22-movablecore/Documentation/kernel-parameters.txt
--- linux-2.6.22-zonemovable/Documentation/kernel-parameters.txt	2007-07-09 11:50:18.000000000 +0100
+++ linux-2.6.22-movablecore/Documentation/kernel-parameters.txt	2007-07-10 11:38:04.000000000 +0100
@@ -850,6 +850,16 @@ and is between 256 and 4096 characters. 
 			use the HighMem zone if it exists, and the Normal
 			zone if it does not.
 
+	movablecore=nn[KMG]	[KNL,IA-32,IA-64,PPC,X86-64] 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
+			that the amount of memory usable for all allocations
+			is not too small.
+
 	keepinitrd	[HW,ARM]
 
 	kstack=N	[IA-32,X86-64] Print N words from the kernel stack
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.22-zonemovable/mm/page_alloc.c linux-2.6.22-movablecore/mm/page_alloc.c
--- linux-2.6.22-zonemovable/mm/page_alloc.c	2007-07-09 11:50:18.000000000 +0100
+++ linux-2.6.22-movablecore/mm/page_alloc.c	2007-07-13 10:37:37.000000000 +0100
@@ -137,6 +137,7 @@ static unsigned long __meminitdata dma_r
   unsigned long __initdata node_boundary_end_pfn[MAX_NUMNODES];
 #endif /* CONFIG_MEMORY_HOTPLUG_RESERVE */
   unsigned long __initdata required_kernelcore;
+  unsigned long __initdata required_movablecore;
   unsigned long __initdata zone_movable_pfn[MAX_NUMNODES];
 
   /* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */
@@ -2980,6 +2981,18 @@ unsigned long __init find_max_pfn_with_a
 	return max_pfn;
 }
 
+unsigned long __init early_calculate_totalpages(void)
+{
+	int i;
+	unsigned long totalpages = 0;
+
+	for (i = 0; i < nr_nodemap_entries; i++)
+		totalpages += early_node_map[i].end_pfn -
+						early_node_map[i].start_pfn;
+
+	return totalpages;
+}
+
 /*
  * Find the PFN the Movable zone begins in each node. Kernel memory
  * is spread evenly between nodes as long as the nodes have enough
@@ -2993,6 +3006,29 @@ void __init find_zone_movable_pfns_for_n
 	unsigned long kernelcore_node, kernelcore_remaining;
 	int usable_nodes = num_online_nodes();
 
+	/*
+	 * If movablecore was specified, calculate what size of
+	 * kernelcore that corresponds so that memory usable for
+	 * any allocation type is evenly spread. If both kernelcore
+	 * and movablecore are specified, then the value of kernelcore
+	 * will be used for required_kernelcore if it's greater than
+	 * what movablecore would have allowed.
+	 */
+	if (required_movablecore) {
+		unsigned long totalpages = early_calculate_totalpages();
+		unsigned long corepages;
+
+		/*
+		 * Round-up so that ZONE_MOVABLE is at least as large as what
+		 * was requested by the user
+		 */
+		required_movablecore =
+			roundup(required_movablecore, MAX_ORDER_NR_PAGES);
+		corepages = totalpages - required_movablecore;
+
+		required_kernelcore = max(required_kernelcore, corepages);
+	}
+
 	/* If kernelcore was not specified, there is no ZONE_MOVABLE */
 	if (!required_kernelcore)
 		return;
@@ -3173,26 +3209,41 @@ void __init free_area_init_nodes(unsigne
 	}
 }
 
-/*
- * kernelcore=size sets the amount of memory for use for allocations that
- * cannot be reclaimed or migrated.
- */
-static int __init cmdline_parse_kernelcore(char *p)
+static int __init cmdline_parse_core(char *p, unsigned long *core)
 {
 	unsigned long long coremem;
 	if (!p)
 		return -EINVAL;
 
 	coremem = memparse(p, &p);
-	required_kernelcore = coremem >> PAGE_SHIFT;
+	*core = coremem >> PAGE_SHIFT;
 
-	/* Paranoid check that UL is enough for required_kernelcore */
+	/* Paranoid check that UL is enough for the coremem value */
 	WARN_ON((coremem >> PAGE_SHIFT) > ULONG_MAX);
 
 	return 0;
 }
 
+/*
+ * kernelcore=size sets the amount of memory for use for allocations that
+ * cannot be reclaimed or migrated.
+ */
+static int __init cmdline_parse_kernelcore(char *p)
+{
+	return cmdline_parse_core(p, &required_kernelcore);
+}
+
+/*
+ * movablecore=size sets the amount of memory for use for allocations that
+ * can be reclaimed or migrated.
+ */
+static int __init cmdline_parse_movablecore(char *p)
+{
+	return cmdline_parse_core(p, &required_movablecore);
+}
+
 early_param("kernelcore", cmdline_parse_kernelcore);
+early_param("movablecore", cmdline_parse_movablecore);
 
 #endif /* CONFIG_ARCH_POPULATES_NODE_MAP */
 
-
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