From: Nick Piggin <npiggin@suse.de>
To: Andrew Morton <akpm@osdl.org>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>,
Nick Piggin <npiggin@suse.de>,
Linux Memory Management <linux-mm@kvack.org>
Subject: [patch 2/2] radix-tree: small
Date: Tue, 25 Apr 2006 06:52:55 +0200 (CEST) [thread overview]
Message-ID: <20060303174228.10573.37986.sendpatchset@linux.site> (raw)
In-Reply-To: <20060303174218.10573.71812.sendpatchset@linux.site>
Reduce radix tree node memory usage by about a factor of 4 for small
files (< 64K). There are pointer traversal and memory usage costs for
large files with dense pagecache.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Index: linux-2.6/lib/radix-tree.c
===================================================================
--- linux-2.6.orig/lib/radix-tree.c
+++ linux-2.6/lib/radix-tree.c
@@ -33,7 +33,7 @@
#ifdef __KERNEL__
-#define RADIX_TREE_MAP_SHIFT 6
+#define RADIX_TREE_MAP_SHIFT (CONFIG_BASE_SMALL ? 4 : 6)
#else
#define RADIX_TREE_MAP_SHIFT 3 /* For more stressful testing */
#endif
WARNING: multiple messages have this Message-ID (diff)
From: Nick Piggin <npiggin@suse.de>
To: Andrew Morton <akpm@osdl.org>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>,
Nick Piggin <npiggin@suse.de>,
Linux Memory Management <linux-mm@kvack.org>
Subject: [patch 2/2] radix-tree: small
Date: Tue, 25 Apr 2006 06:52:55 +0200 (CEST) [thread overview]
Message-ID: <20060303174228.10573.37986.sendpatchset@linux.site> (raw)
In-Reply-To: <20060303174218.10573.71812.sendpatchset@linux.site>
Reduce radix tree node memory usage by about a factor of 4 for small
files (< 64K). There are pointer traversal and memory usage costs for
large files with dense pagecache.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Index: linux-2.6/lib/radix-tree.c
===================================================================
--- linux-2.6.orig/lib/radix-tree.c
+++ linux-2.6/lib/radix-tree.c
@@ -33,7 +33,7 @@
#ifdef __KERNEL__
-#define RADIX_TREE_MAP_SHIFT 6
+#define RADIX_TREE_MAP_SHIFT (CONFIG_BASE_SMALL ? 4 : 6)
#else
#define RADIX_TREE_MAP_SHIFT 3 /* For more stressful testing */
#endif
--
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next prev parent reply other threads:[~2006-04-25 4:53 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-25 4:52 [patch 1/2] radix-tree: direct data Nick Piggin
2006-04-25 4:52 ` Nick Piggin
2006-04-25 4:52 ` Nick Piggin [this message]
2006-04-25 4:52 ` [patch 2/2] radix-tree: small Nick Piggin
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