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Provide a tunable (machdep.moea64_bpvo_pool_size) to set the bootstrap

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PVO pool size. The default errs on the exceedingly large side, so absent
any intelligent automatic tuning, at least let the user set it to save
RAM on memory-constrained systems.

MFC after:	2 weeks
This commit is contained in:
nwhitehorn 2015-01-19 05:14:07 +00:00
parent af9bc7a40f
commit 989d372488
1 changed files with 7 additions and 6 deletions
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13
sys/powerpc/aim/mmu_oea64.c
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@ -221,9 +221,10 @@ struct pvo_head *moea64_pvo_table; /* pvo entries by pteg index */
uma_zone_t moea64_upvo_zone; /* zone for pvo entries for unmanaged pages */
uma_zone_t moea64_mpvo_zone; /* zone for pvo entries for managed pages */
#define BPVO_POOL_SIZE 327680
static struct pvo_entry *moea64_bpvo_pool;
static int moea64_bpvo_pool_index = 0;
static int moea64_bpvo_pool_size = 327680;
TUNABLE_INT("machdep.moea64_bpvo_pool_size", &moea64_bpvo_pool_size);
SYSCTL_INT(_machdep, OID_AUTO, moea64_allocated_bpvo_entries, CTLFLAG_RD,
&moea64_bpvo_pool_index, 0, "");
@ -647,7 +648,7 @@ moea64_setup_direct_map(mmu_t mmup, vm_offset_t kernelstart,
off = (vm_offset_t)(moea64_pvo_table);
for (pa = off; pa < off + size; pa += PAGE_SIZE)
moea64_kenter(mmup, pa, pa);
size = BPVO_POOL_SIZE*sizeof(struct pvo_entry);
size = moea64_bpvo_pool_size*sizeof(struct pvo_entry);
off = (vm_offset_t)(moea64_bpvo_pool);
for (pa = off; pa < off + size; pa += PAGE_SIZE)
moea64_kenter(mmup, pa, pa);
@ -815,7 +816,7 @@ moea64_mid_bootstrap(mmu_t mmup, vm_offset_t kernelstart, vm_offset_t kernelend)
* Initialise the unmanaged pvo pool.
*/
moea64_bpvo_pool = (struct pvo_entry *)moea64_bootstrap_alloc(
BPVO_POOL_SIZE*sizeof(struct pvo_entry), 0);
moea64_bpvo_pool_size*sizeof(struct pvo_entry), 0);
moea64_bpvo_pool_index = 0;
/*
@ -2282,10 +2283,10 @@ moea64_pvo_enter(mmu_t mmu, pmap_t pm, uma_zone_t zone,
* If we aren't overwriting a mapping, try to allocate.
*/
if (bootstrap) {
if (moea64_bpvo_pool_index >= BPVO_POOL_SIZE) {
if (moea64_bpvo_pool_index >= moea64_bpvo_pool_size) {
panic("moea64_enter: bpvo pool exhausted, %d, %d, %zd",
moea64_bpvo_pool_index, BPVO_POOL_SIZE,
BPVO_POOL_SIZE * sizeof(struct pvo_entry));
moea64_bpvo_pool_index, moea64_bpvo_pool_size,
moea64_bpvo_pool_size * sizeof(struct pvo_entry));
}
pvo = &moea64_bpvo_pool[moea64_bpvo_pool_index];
moea64_bpvo_pool_index++;