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vm_reserv: Add vm_reserv_is_populated

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Add a function to check whether an aligned block of vm pages are
allocated, for use with impending changes to arm64 superpage
managment.

Reviewed by:	alc
Differential Revision:	http://reviews.freebsd.org/D44575
This commit is contained in:
Doug Moore 2024-04-07 12:19:41 -05:00
parent 61e482f2fc
commit 1526667bc6
2 changed files with 22 additions and 0 deletions
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21
sys/vm/vm_reserv.c
View file

@ -1058,6 +1058,27 @@ vm_reserv_is_page_free(vm_page_t m)
return (!bit_test(rv->popmap, m - rv->pages));
}
/*
* Returns true if the given page is part of a block of npages, starting at a
* multiple of npages, that are all allocated. Otherwise, returns false.
*/
bool
vm_reserv_is_populated(vm_page_t m, int npages)
{
vm_reserv_t rv;
int index;
KASSERT(npages <= VM_LEVEL_0_NPAGES,
("%s: npages %d exceeds VM_LEVEL_0_NPAGES", __func__, npages));
KASSERT(powerof2(npages),
("%s: npages %d is not a power of 2", __func__, npages));
rv = vm_reserv_from_page(m);
if (rv->object == NULL)
return (false);
index = rounddown2(m - rv->pages, npages);
return (bit_ntest(rv->popmap, index, index + npages - 1, 1));
}
/*
* If the given page belongs to a reservation, returns the level of that
* reservation. Otherwise, returns -1.

1
sys/vm/vm_reserv.h
View file

@ -55,6 +55,7 @@ void vm_reserv_break_all(vm_object_t object);
boolean_t vm_reserv_free_page(vm_page_t m);
void vm_reserv_init(void);
bool vm_reserv_is_page_free(vm_page_t m);
bool vm_reserv_is_populated(vm_page_t m, int npages);
int vm_reserv_level(vm_page_t m);
int vm_reserv_level_iffullpop(vm_page_t m);
vm_page_t vm_reserv_reclaim_contig(int domain, u_long npages,