[PATCH 1/2] mm: configure lruvec split by boot options

[Konstantin Khlebnikov]

This patch adds boot options:
lruvec_split=%u by default 1, limited by CONFIG_PAGE_LRU_SPLIT
lruvec_interleaving=%u by default CONFIG_PAGE_LRU_INTERLEAVING

Signed-off-by: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxx>
---
 include/linux/mm.h |    5 ++++-
 mm/internal.h      |    2 +-
 mm/page_alloc.c    |   29 +++++++++++++++++++++++++++++
 3 files changed, 34 insertions(+), 2 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index d14db10..f042a34 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -737,12 +737,15 @@ static inline int page_lruvec_id(struct page *page)
 
 #else /* CONFIG_PAGE_LRU_SPLIT */
 
+extern unsigned lruvec_split;
+extern unsigned lruvec_interleaving;
+
 static inline int page_lruvec_id(struct page *page)
 {
 
 	unsigned long pfn = page_to_pfn(page);
 
-	return (pfn >> CONFIG_PAGE_LRU_INTERLEAVING) % CONFIG_PAGE_LRU_SPLIT;
+	return (pfn >> lruvec_interleaving) % lruvec_split;
 }
 
 #endif /* CONFIG_PAGE_LRU_SPLIT */
diff --git a/mm/internal.h b/mm/internal.h
index f429911..be7415b 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -17,7 +17,7 @@
 	for ( zone_id = 0 ; zone_id < MAX_NR_ZONES ; zone_id++ )
 
 #define for_each_lruvec_id(lruvec_id) \
-	for ( lruvec_id = 0 ; lruvec_id < CONFIG_PAGE_LRU_SPLIT ; lruvec_id++ )
+	for ( lruvec_id = 0 ; lruvec_id < lruvec_split ; lruvec_id++ )
 
 #define for_each_zone_and_lruvec_id(zone_id, lruvec_id) \
 	for_each_zone_id(zone_id) for_each_lruvec_id(lruvec_id)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 9b0cc92..1a899fa 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4303,6 +4303,35 @@ void init_zone_lruvec(struct zone *zone, struct lruvec *lruvec)
 #endif
 }
 
+#if CONFIG_PAGE_LRU_SPLIT != 1
+
+unsigned lruvec_split = 1;
+unsigned lruvec_interleaving = CONFIG_PAGE_LRU_INTERLEAVING;
+
+static int __init set_lruvec_split(char *arg)
+{
+	if (!kstrtouint(arg, 0, &lruvec_split) &&
+	    lruvec_split >= 1 &&
+	    lruvec_split <= CONFIG_PAGE_LRU_SPLIT)
+		return 0;
+	lruvec_split = 1;
+	return 1;
+}
+early_param("lruvec_split", set_lruvec_split);
+
+static int __init set_lruvec_interleaving(char *arg)
+{
+	if (!kstrtouint(arg, 0, &lruvec_interleaving) &&
+	    lruvec_interleaving >= HPAGE_PMD_ORDER &&
+	    lruvec_interleaving <= BITS_PER_LONG)
+		return 0;
+	lruvec_split = 1;
+	return 1;
+}
+early_param("lruvec_interleaving", set_lruvec_interleaving);
+
+#endif
+
 /*
  * Set up the zone data structures:
  *   - mark all pages reserved

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