From 1fc5d959d88a5f77aa7e4435f6c9d0e2d2236704 Mon Sep 17 00:00:00 2001
From: David Chinner <dgc@sgi.com>
Date: Tue, 11 Apr 2006 15:11:12 +1000
Subject: [XFS] Fix inode reclaim scalability regression. When a filesystem has
millions of inodes cached and has sparse cluster population, removing inodes
from the cluster hash consumes excessive amounts of CPU time. Reduce the CPU
cost by making removal O(1) via use of a double linked list for the hash
chains.
SGI-PV: 951551
SGI-Modid: xfs-linux-melb:xfs-kern:25683a
Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>
---
fs/xfs/xfs_inode.h | 1 +
1 file changed, 1 insertion(+)
(limited to 'fs/xfs/xfs_inode.h')
diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index 39ef9c36ea55..3b544db1790b 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -189,6 +189,7 @@ typedef struct xfs_ihash {
*/
typedef struct xfs_chashlist {
struct xfs_chashlist *chl_next;
+ struct xfs_chashlist *chl_prev;
struct xfs_inode *chl_ip;
xfs_daddr_t chl_blkno; /* starting block number of
* the cluster */
--
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