Date: Mon, 20 Jun 2005 12:44:33 +0200 From: des@des.no (=?iso-8859-1?q?Dag-Erling_Sm=F8rgrav?=) To: Dmitry Pryanishnikov <dmitry@atlantis.dp.ua> Cc: cvs-src@FreeBSD.ORG, src-committers@FreeBSD.ORG Subject: Re: cvs commit: src/sys/vm uma_int.h Message-ID: <86y895gve6.fsf@xps.des.no> In-Reply-To: <20050620124020.H21125@atlantis.atlantis.dp.ua> (Dmitry Pryanishnikov's message of "Mon, 20 Jun 2005 12:45:37 %2B0300 (EEST)") References: <20050620124020.H21125@atlantis.atlantis.dp.ua>
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Dmitry Pryanishnikov <dmitry@atlantis.dp.ua> writes:
> Is it possible to tune this (or ideally, autotune) from the loader (or du=
ring
> the initialization of the kernel itself)?
The attached patch adds a vm.boot_pages tunable and a corresponding
read-only sysctl variable. Note that I haven't tested it (except to
make sure it compiles).
DES
--=20
Dag-Erling Sm=F8rgrav - des@des.no
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Index: sys/vm/vm_page.c
===================================================================
RCS file: /home/ncvs/src/sys/vm/vm_page.c,v
retrieving revision 1.304
diff -u -r1.304 vm_page.c
--- sys/vm/vm_page.c 15 Mar 2005 14:14:09 -0000 1.304
+++ sys/vm/vm_page.c 20 Jun 2005 10:41:07 -0000
@@ -102,9 +102,11 @@
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/lock.h>
+#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/proc.h>
+#include <sys/sysctl.h>
#include <sys/vmmeter.h>
#include <sys/vnode.h>
@@ -132,6 +134,11 @@
long first_page = 0;
int vm_page_zero_count = 0;
+static int boot_pages = UMA_BOOT_PAGES;
+TUNABLE_INT("vm.boot_pages", &boot_pages);
+SYSCTL_INT(_vm, OID_AUTO, boot_pages, CTLFLAG_RD, &boot_pages, 0,
+ "number of pages allocated for bootstrapping the VM system");
+
/*
* vm_set_page_size:
*
@@ -175,7 +182,6 @@
int biggestone;
vm_paddr_t total;
- vm_size_t bootpages;
total = 0;
biggestsize = 0;
@@ -219,8 +225,7 @@
* Allocate memory for use when boot strapping the kernel memory
* allocator.
*/
- bootpages = UMA_BOOT_PAGES * UMA_SLAB_SIZE;
- new_end = end - bootpages;
+ new_end = end - (boot_pages * UMA_SLAB_SIZE);
new_end = trunc_page(new_end);
mapped = pmap_map(&vaddr, new_end, end,
VM_PROT_READ | VM_PROT_WRITE);
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