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Code Issues Releases Activity

sun4v requires TSBs (translation storage buffers) to be contiguous and be

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size aligned requiring heavy usage of vm_page_alloc_contig

This change makes vm_page_alloc_contig SMP safe

Approved by: scottl (acting as backup for mentor rwatson)
This commit is contained in:
Kip Macy 2006-10-12 04:41:39 +00:00
parent 5fe4c0e842
commit 600c53adf9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=163259
1 changed files with 6 additions and 4 deletions
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10
sys/vm/vm_contig.c
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@ -398,7 +398,8 @@ vm_page_alloc_contig(vm_pindex_t npages, vm_paddr_t low, vm_paddr_t high,
vm_page_t pga = vm_page_array; vm_page_t pga = vm_page_array;
static vm_pindex_t np = 0; static vm_pindex_t np = 0;
static vm_pindex_t start = 0; static vm_pindex_t start = 0;
int i, pass, pqtype; vm_pindex_t startl = 0;
int i, pass, pqtype;
size = npages << PAGE_SHIFT; size = npages << PAGE_SHIFT;
if (size == 0) if (size == 0)
@ -417,6 +418,7 @@ vm_page_alloc_contig(vm_pindex_t npages, vm_paddr_t low, vm_paddr_t high,
* cached amount. * cached amount.
*/ */
for (pass = 0; pass < 2; pass++) { for (pass = 0; pass < 2; pass++) {
vm_page_lock_queues();
if ((np == 0) || (np > npages)) { if ((np == 0) || (np > npages)) {
if (atop(high) < vm_page_array_size) if (atop(high) < vm_page_array_size)
start = atop(high) - npages + 1; start = atop(high) - npages + 1;
@ -424,7 +426,6 @@ vm_page_alloc_contig(vm_pindex_t npages, vm_paddr_t low, vm_paddr_t high,
start = vm_page_array_size - npages + 1; start = vm_page_array_size - npages + 1;
} }
np = 0; np = 0;
vm_page_lock_queues();
retry: retry:
start--; start--;
/* /*
@ -517,12 +518,13 @@ vm_page_alloc_contig(vm_pindex_t npages, vm_paddr_t low, vm_paddr_t high,
if (vm_contig_unqueue_free(m) != 0) if (vm_contig_unqueue_free(m) != 0)
goto retry_page; goto retry_page;
} }
vm_page_unlock_queues();
/* /*
* We've found a contiguous chunk that meets are requirements. * We've found a contiguous chunk that meets are requirements.
*/ */
np = npages; np = npages;
return (&pga[start]); startl = start;
vm_page_unlock_queues();
return (&pga[startl]);
} }
return (NULL); return (NULL);
} }