Atrocious icache/dcache in 2.4.2

Hi,

Here is a patch that prunes unused, clean inodes from the icache faster. I have previously checked out cleaning the unused dirty icache entries from the the same place in kswapd but did not find it to be much a win.

This code does the following. It factors prune_icache to use,
prune_unused_icache to actually prune the list. This makes it
simple to add a shrink_unused_icache_memory routine which gets plugged into the kswapd loop. The result is the icache is kept smaller.

fast_prune.diff
-----

@@ -176,6 +176,7 @@
 
 /* icache memory management (defined in linux/fs/inode.c) */
 extern void shrink_icache_memory(int, int);
+extern void shrink_unused_icache_memory(int);
 extern void prune_icache(int);
 
 /* only used at mount-time */

@@ -953,6 +953,11 @@
 		 */
 		refill_inactive_scan(DEF_PRIORITY, 0);
 
+		/* 
+		 * Free unused inodes.
+		 */
+		shrink_unused_icache_memory(GFP_KSWAPD);
+
 		/* Once a second, recalculate some VM stats. */
 		if (time_after(jiffies, recalc + HZ)) {
 			recalc = jiffies;

-----

Comments?

Ed Tomlinson <[email protected]>
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