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| author | dyson <dyson@FreeBSD.org> | 1996-06-26 05:39:27 +0000 |
|---|---|---|
| committer | dyson <dyson@FreeBSD.org> | 1996-06-26 05:39:27 +0000 |
| commit | 9f0819bc54b2152ee968fc72f9a450d2b4ff862e (patch) | |
| tree | 48f770f322cba924e42b174cb8cb3f34755ab4ff /sys/vm/vm_page.h | |
| parent | 9ca4dee9f50d3922b026ecabfc5169f84c89ae72 (diff) | |
| download | FreeBSD-src-9f0819bc54b2152ee968fc72f9a450d2b4ff862e.zip FreeBSD-src-9f0819bc54b2152ee968fc72f9a450d2b4ff862e.tar.gz | |
This commit does a couple of things:
Re-enables the RSS limiting, and the routine is now tail-recursive,
making it much more safe (eliminates the possiblity of kernel stack
overflow.) Also, the RSS limiting is a little more intelligent about
finding the likely objects that are pushing the process over the limit.
Added some sysctls that help with VM system tuning.
New sysctl features:
1) Enable/disable lru pageout algorithm.
vm.pageout_algorithm = 0, default algorithm that works
well, especially using X windows and heavy
memory loading. Can have adverse effects,
sometimes slowing down program loading.
vm.pageout_algorithm = 1, close to true LRU. Works much
better than clock, etc. Does not work as well as
the default algorithm in general. Certain memory
"malloc" type benchmarks work a little better with
this setting.
Please give me feedback on the performance results
associated with these.
2) Enable/disable swapping.
vm.swapping_enabled = 1, default.
vm.swapping_enabled = 0, useful for cases where swapping
degrades performance.
The config option "NO_SWAPPING" is still operative, and
takes precedence over the sysctl. If "NO_SWAPPING" is
specified, the sysctl still exists, but "vm.swapping_enabled"
is hard-wired to "0".
Each of these can be changed "on the fly."
Diffstat (limited to 'sys/vm/vm_page.h')
| -rw-r--r-- | sys/vm/vm_page.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/sys/vm/vm_page.h b/sys/vm/vm_page.h index b274316..c246deb 100644 --- a/sys/vm/vm_page.h +++ b/sys/vm/vm_page.h @@ -61,7 +61,7 @@ * any improvements or extensions that they make and grant Carnegie the * rights to redistribute these changes. * - * $Id: vm_page.h,v 1.27 1996/06/05 03:31:49 dyson Exp $ + * $Id: vm_page.h,v 1.28 1996/06/08 06:48:35 dyson Exp $ */ /* @@ -147,7 +147,8 @@ struct vm_page { #define ACT_DECLINE 1 #define ACT_ADVANCE 3 -#define ACT_MAX 100 +#define ACT_INIT 5 +#define ACT_MAX 32 #define PFCLUSTER_BEHIND 3 #define PFCLUSTER_AHEAD 3 |
