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Size the number of pv_entries we use to bootstrap the pv_entry allocator

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based on the size of physical memory. This should eliminate the tweaking
needed for larger memory configurations.
This commit is contained in:
Doug Rabson 2001-10-16 08:03:16 +00:00
parent 150e0ea706
commit ebc26de418
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=85024
1 changed files with 16 additions and 5 deletions
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21
sys/ia64/ia64/pmap.c
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@ -226,6 +226,9 @@ static struct vm_object pvzone_obj;
static int pv_entry_count = 0, pv_entry_max = 0, pv_entry_high_water = 0;
static int pmap_pagedaemon_waken = 0;
static struct pv_entry *pvinit;
static struct pv_entry *pvbootentries;
static int pvbootnext, pvbootmax;
static PMAP_INLINE void free_pv_entry __P((pv_entry_t pv));
static pv_entry_t get_pv_entry __P((void));
@ -345,6 +348,18 @@ pmap_bootstrap()
#if 0
thread0->td_pcb->pcb_hw.apcb_asn = 0;
#endif
/*
* Reserve some memory for allocating pvs while bootstrapping
* the pv allocator. We need to have enough to cover mapping
* the kmem_alloc region used to allocate the initial_pvs in
* pmap_init. In general, the size of this region is
* appoximately (# physical pages) * (size of pv entry).
*/
pvbootmax = ((physmem * sizeof(struct pv_entry)) >> PAGE_SHIFT) + 128;
pvbootentries = (struct pv_entry *)
pmap_steal_memory(pvbootmax * sizeof(struct pv_entry));
pvbootnext = 0;
}
/*
@ -777,11 +792,7 @@ get_pv_entry(void)
* cover this.
*/
if (!pvinit) {
#define PV_BOOTSTRAP_NEEDED 2048
static struct pv_entry pvbootentries[PV_BOOTSTRAP_NEEDED];
static int pvbootnext = 0;
if (pvbootnext == PV_BOOTSTRAP_NEEDED)
if (pvbootnext == pvbootmax)
panic("get_pv_entry: called too many times"
" before pmap_init is finished");
return &pvbootentries[pvbootnext++];