DragonFly kernel List (threaded) for 2003-09
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Re: Tentitive (untested) ISA DMA space allocation fix.
Scrap the old patch, it was still allocating low memory first
in some cases and I improperly reversed the loop. Here is a new,
better one.
I don't know if this will solve David's issue with twe. If not
then hopefully I will be able to track it down when I get my TWE
card in about two weeks. I'll also take a quick look at the TWE
code to see if there is something obvious.
-Matt
Index: vm/vm_page.c
===================================================================
RCS file: /cvs/src/sys/vm/vm_page.c,v
retrieving revision 1.9
diff -u -r1.9 vm_page.c
--- vm/vm_page.c 27 Aug 2003 01:43:08 -0000 1.9
+++ vm/vm_page.c 14 Sep 2003 17:44:50 -0000
@@ -150,13 +150,18 @@
/*
* vm_add_new_page:
*
- * Add a new page to the freelist for use by the system.
+ * Add a new page to the freelist for use by the system. New pages
+ * are added to both the head and tail of the associated free page
+ * queue in a bottom-up fashion, so both zero'd and non-zero'd page
+ * requests pull 'recent' adds (higher physical addresses) first.
+ *
* Must be called at splhigh().
*/
vm_page_t
vm_add_new_page(vm_offset_t pa)
{
vm_page_t m;
+ struct vpgqueues *vpq;
++vmstats.v_page_count;
++vmstats.v_free_count;
@@ -165,7 +170,12 @@
m->flags = 0;
m->pc = (pa >> PAGE_SHIFT) & PQ_L2_MASK;
m->queue = m->pc + PQ_FREE;
- TAILQ_INSERT_HEAD(&vm_page_queues[m->queue].pl, m, pageq);
+ vpq = &vm_page_queues[m->queue];
+ if (vpq->flipflop)
+ TAILQ_INSERT_TAIL(&vpq->pl, m, pageq);
+ else
+ TAILQ_INSERT_HEAD(&vpq->pl, m, pageq);
+ vpq->flipflop = 1 - vpq->flipflop;
vm_page_queues[m->queue].lcnt++;
return (m);
}
@@ -304,7 +314,7 @@
vm_page_array_size = page_range;
/*
- * Construct the free queue(s) in descending order (by physical
+ * Construct the free queue(s) in ascending order (by physical
* address) so that the first 16MB of physical memory is allocated
* last rather than first. On large-memory machines, this avoids
* the exhaustion of low physical memory before isa_dmainit has run.
Index: vm/vm_page.h
===================================================================
RCS file: /cvs/src/sys/vm/vm_page.h,v
retrieving revision 1.5
diff -u -r1.5 vm_page.h
--- vm/vm_page.h 26 Jul 2003 22:10:02 -0000 1.5
+++ vm/vm_page.h 14 Sep 2003 17:39:04 -0000
@@ -215,6 +215,7 @@
struct pglist pl;
int *cnt;
int lcnt;
+ int flipflop; /* probably not the best place */
};
extern struct vpgqueues vm_page_queues[PQ_COUNT];
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