Add some extra vmemmap pr_debug message that will indicate the type of
vmemmap allocations.
For ex: with DAX vmemmap optimization we can find the below details:
[ 187.166580] radix-mmu: PAGE_SIZE vmemmap mapping
[ 187.166587] radix-mmu: PAGE_SIZE vmemmap mapping
[ 187.166591] radix-mmu: Tail page reuse vmemmap mapping
[ 187.166594] radix-mmu: Tail page reuse vmemmap mapping
[ 187.166598] radix-mmu: Tail page reuse vmemmap mapping
[ 187.166601] radix-mmu: Tail page reuse vmemmap mapping
[ 187.166604] radix-mmu: Tail page reuse vmemmap mapping
[ 187.166608] radix-mmu: Tail page reuse vmemmap mapping
[ 187.166611] radix-mmu: Tail page reuse vmemmap mapping
[ 187.166614] radix-mmu: Tail page reuse vmemmap mapping
[ 187.166617] radix-mmu: Tail page reuse vmemmap mapping
[ 187.166620] radix-mmu: Tail page reuse vmemmap mapping
[ 187.166623] radix-mmu: Tail page reuse vmemmap mapping
[ 187.166626] radix-mmu: Tail page reuse vmemmap mapping
[ 187.166629] radix-mmu: Tail page reuse vmemmap mapping
[ 187.166632] radix-mmu: Tail page reuse vmemmap mapping
And without vmemmap optimization
[ 293.549931] radix-mmu: PMD_SIZE vmemmap mapping
[ 293.549984] radix-mmu: PMD_SIZE vmemmap mapping
[ 293.550032] radix-mmu: PMD_SIZE vmemmap mapping
[ 293.550076] radix-mmu: PMD_SIZE vmemmap mapping
[ 293.550117] radix-mmu: PMD_SIZE vmemmap mapping
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
---
arch/powerpc/mm/book3s64/radix_pgtable.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/powerpc/mm/book3s64/radix_pgtable.c b/arch/powerpc/mm/book3s64/radix_pgtable.c
index 25b46058f556..59aaa30a7c0d 100644
--- a/arch/powerpc/mm/book3s64/radix_pgtable.c
+++ b/arch/powerpc/mm/book3s64/radix_pgtable.c
@@ -1033,6 +1033,7 @@ static pte_t * __meminit radix__vmemmap_pte_populate(pmd_t *pmdp, unsigned long
p = vmemmap_alloc_block_buf(PAGE_SIZE, node, NULL);
if (!p)
return NULL;
+ pr_debug("PAGE_SIZE vmemmap mapping\n");
} else {
/*
* When a PTE/PMD entry is freed from the init_mm
@@ -1045,6 +1046,7 @@ static pte_t * __meminit radix__vmemmap_pte_populate(pmd_t *pmdp, unsigned long
*/
get_page(reuse);
p = page_to_virt(reuse);
+ pr_debug("Tail page reuse vmemmap mapping\n");
}
VM_BUG_ON(!PAGE_ALIGNED(addr));
@@ -1154,6 +1156,7 @@ int __meminit radix__vmemmap_populate(unsigned long start, unsigned long end, in
p = vmemmap_alloc_block_buf(PMD_SIZE, node, altmap);
if (p) {
vmemmap_set_pmd(pmd, p, node, addr, next);
+ pr_debug("PMD_SIZE vmemmap mapping\n");
continue;
} else if (altmap) {
/*
--
2.41.0
