On Fri, 7 Oct 2005 12:01 am, Con Kolivas wrote:
> The last known bugs were addressed in this latest version of the swap
> prefetching patch. Thanks to the testers out there who helped it get this
> far.
>
> -Prefetched pages weren't handled properly by the lru lists.
> -Prefetch groups are now 10 times larger when laptop_mode is enabled thus
> decreasing the amount of time spent prefetching and thus the disk spinning.
> -Documentation as suggested by Ingo Oeser
>
> Incremental patches and latest available here:
> http://ck.kolivas.org/patches/swap-prefetch/
And the docs...
Cheers,
Con
---
Index: linux-2.6.13-ck7/Documentation/sysctl/vm.txt
===================================================================
--- linux-2.6.13-ck7.orig/Documentation/sysctl/vm.txt 2005-03-02 18:38:17.000000000 +1100
+++ linux-2.6.13-ck7/Documentation/sysctl/vm.txt 2005-10-06 23:10:54.000000000 +1000
@@ -26,6 +26,7 @@ Currently, these files are in /proc/sys/
- min_free_kbytes
- laptop_mode
- block_dump
+- swap_prefetch
==============================================================
@@ -102,3 +103,14 @@ This is used to force the Linux VM to ke
of kilobytes free. The VM uses this number to compute a pages_min
value for each lowmem zone in the system. Each lowmem zone gets
a number of reserved free pages based proportionally on its size.
+
+==============================================================
+
+swap_prefetch
+
+This is the amount of data prefetched per prefetching interval when
+swap prefetching is compiled in. The value means multiples of 128K,
+except when laptop_mode is enabled and then it is ten times larger.
+Setting it to 0 disables prefetching entirely.
+
+The default value is 2.
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