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powerpc/mm/book3s/radix: Add mapping statistics

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Add statistics that show how memory is mapped within the kernel linear mapping.
This is similar to commit 37cd944c8d ("s390/pgtable: add mapping statistics")

We don't do this with Hash translation mode. Hash uses one size (mmu_linear_psize)
to map the kernel linear mapping and we print the linear psize during boot as
below.

"Page orders: linear mapping = 24, virtual = 16, io = 16, vmemmap = 24"

A sample output looks like:

DirectMap4k:           0 kB
DirectMap64k:       18432 kB
DirectMap2M:     1030144 kB
DirectMap1G:    11534336 kB

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Aneesh Kumar K.V
2018-08-13 11:14:57 +05:30
committed by Michael Ellerman
parent 241b5f7ffc
commit a2dc009afa
4 changed files with 46 additions and 5 deletions
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19
arch/powerpc/mm/pgtable-radix.c
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@@ -267,6 +267,7 @@ static int __meminit create_physical_mapping(unsigned long start,
#else
int split_text_mapping = 0;
#endif
int psize;
start = _ALIGN_UP(start, PAGE_SIZE);
for (addr = start; addr < end; addr += mapping_size) {
@@ -280,13 +281,17 @@ static int __meminit create_physical_mapping(unsigned long start,
retry:
if (IS_ALIGNED(addr, PUD_SIZE) && gap >= PUD_SIZE &&
mmu_psize_defs[MMU_PAGE_1G].shift &&
PUD_SIZE <= max_mapping_size)
PUD_SIZE <= max_mapping_size) {
mapping_size = PUD_SIZE;
else if (IS_ALIGNED(addr, PMD_SIZE) && gap >= PMD_SIZE &&
mmu_psize_defs[MMU_PAGE_2M].shift)
psize = MMU_PAGE_1G;
} else if (IS_ALIGNED(addr, PMD_SIZE) && gap >= PMD_SIZE &&
mmu_psize_defs[MMU_PAGE_2M].shift) {
mapping_size = PMD_SIZE;
else
psize = MMU_PAGE_2M;
} else {
mapping_size = PAGE_SIZE;
psize = mmu_virtual_psize;
}
if (split_text_mapping && (mapping_size == PUD_SIZE) &&
(addr <= __pa_symbol(__init_begin)) &&
@@ -297,8 +302,10 @@ retry:
if (split_text_mapping && (mapping_size == PMD_SIZE) &&
(addr <= __pa_symbol(__init_begin)) &&
(addr + mapping_size) >= __pa_symbol(_stext))
(addr + mapping_size) >= __pa_symbol(_stext)) {
mapping_size = PAGE_SIZE;
psize = mmu_virtual_psize;
}
if (mapping_size != previous_size) {
print_mapping(start, addr, previous_size);
@@ -316,6 +323,8 @@ retry:
rc = __map_kernel_page(vaddr, addr, prot, mapping_size, nid, start, end);
if (rc)
return rc;
update_page_count(psize, 1);
}
print_mapping(start, addr, mapping_size);