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book3s64/hash: Disable debug_pagealloc if it requires more memory

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Make size of the linear map to be allocated in RMA region to be of
ppc64_rma_size / 4. If debug_pagealloc requires more memory than that
then do not allocate any memory and disable debug_pagealloc.

Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/e1ef66f32a1fe63bcbb89d5c11d86c65beef5ded.1729271995.git.ritesh.list@gmail.com
This commit is contained in:
Ritesh Harjani (IBM) 2024-10-18 22:59:49 +05:30 committed by Michael Ellerman
parent 685d942d00
commit 47dd2e63d4
1 changed files with 14 additions and 1 deletions
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15
arch/powerpc/mm/book3s64/hash_utils.c
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@ -331,9 +331,19 @@ static unsigned long linear_map_hash_count;
static DEFINE_RAW_SPINLOCK(linear_map_hash_lock);
static inline void hash_debug_pagealloc_alloc_slots(void)
{
unsigned long max_hash_count = ppc64_rma_size / 4;
if (!debug_pagealloc_enabled())
return;
linear_map_hash_count = memblock_end_of_DRAM() >> PAGE_SHIFT;
if (unlikely(linear_map_hash_count > max_hash_count)) {
pr_info("linear map size (%llu) greater than 4 times RMA region (%llu). Disabling debug_pagealloc\n",
((u64)linear_map_hash_count << PAGE_SHIFT),
ppc64_rma_size);
linear_map_hash_count = 0;
return;
}
linear_map_hash_slots = memblock_alloc_try_nid(
linear_map_hash_count, 1, MEMBLOCK_LOW_LIMIT,
ppc64_rma_size, NUMA_NO_NODE);
@ -344,7 +354,7 @@ static inline void hash_debug_pagealloc_alloc_slots(void)
static inline void hash_debug_pagealloc_add_slot(phys_addr_t paddr, int slot)
{
if (!debug_pagealloc_enabled())
if (!debug_pagealloc_enabled() || !linear_map_hash_count)
return;
if ((paddr >> PAGE_SHIFT) < linear_map_hash_count)
linear_map_hash_slots[paddr >> PAGE_SHIFT] = slot | 0x80;
@ -356,6 +366,9 @@ static int hash_debug_pagealloc_map_pages(struct page *page, int numpages,
unsigned long flags, vaddr, lmi;
int i;
if (!debug_pagealloc_enabled() || !linear_map_hash_count)
return 0;
local_irq_save(flags);
for (i = 0; i < numpages; i++, page++) {
vaddr = (unsigned long)page_address(page);