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Cap the initial PV and PTE table preallocations. Otherwise we explode

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on the Itanium2 system I have when we use up *all* of the initial 256MB
direct mapped region before we are ready to dynamically expand it.

The machine that I have has 4 cpus and a very big hole in the middle.
This makes the bogus '(last_address - first_address) / PAGE_SIZE'
calculations especially dangerous and caused many millions of initial
PV/PTE's to be preallocated.
This commit is contained in:
Peter Wemm 2002-07-17 23:21:59 +00:00
parent 5e6ce035f1
commit 6ae7b9cb2b
1 changed files with 4 additions and 1 deletions
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5
sys/ia64/ia64/pmap.c
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@ -133,7 +133,8 @@ MALLOC_DEFINE(M_PMAP, "PMAP", "PMAP Structures");
#define PMAP_DIAGNOSTIC
#endif
#define MINPV 2048
#define MINPV 2048 /* Preallocate at least this many */
#define MAXPV 20480 /* But no more than this */
#if 0
#define PMAP_DIAGNOSTIC
@ -521,6 +522,8 @@ pmap_init(vm_offset_t phys_start, vm_offset_t phys_end)
initial_pvs = vm_page_array_size;
if (initial_pvs < MINPV)
initial_pvs = MINPV;
if (initial_pvs > MAXPV)
initial_pvs = MAXPV;
pvzone = uma_zcreate("PV ENTRY", sizeof (struct pv_entry),
NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_VM);
uma_zone_set_allocf(pvzone, pmap_allocf);