lkml.org 
[lkml]   [2006]   [Sep]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH 4/5] linear reclaim add pfn_valid_within for zone holes
linear reclaim add pfn_valid_within for zone holes

Generally we work under the assumption that memory the mem_map array
is contigious and valid out to MAX_ORDER blocks. When this is not
true we much check each and every reference we make from a pfn.
Add a pfn_valid_within() which should be used when checking pages
within a block when we have already checked the validility of the
block normally. This can then be optimised away when we have holes.

Added in: V1

Signed-off-by: Andy Whitcroft <apw@shadowen.org>
---
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 3d31354..8c09638 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -680,6 +680,18 @@ #endif
void memory_present(int nid, unsigned long start, unsigned long end);
unsigned long __init node_memmap_size_bytes(int, unsigned long, unsigned long);

+/*
+ * If we have holes within zones (smaller than MAX_ORDER) then we need
+ * to check pfn validility within MAX_ORDER blocks. pfn_valid_within
+ * should be used in this case; we optimise this away when we have
+ * no holes.
+ */
+#ifdef CONFIG_HOLES_IN_ZONE
+#define pfn_valid_within(pfn) pfn_valid(pfn)
+#else
+#define pfn_valid_within(pfn) (1)
+#endif
+
#endif /* !__ASSEMBLY__ */
#endif /* __KERNEL__ */
#endif /* _LINUX_MMZONE_H */
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
\
 
 \ /
  Last update: 2006-09-08 14:31    [W:0.054 / U:3.884 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site