On Fri, Mar 22, 2024 at 04:23:59PM +0800, Miaohe Lin wrote:
> > +++ b/mm/hugetlb.c
> > @@ -1796,7 +1796,8 @@ static void __update_and_free_hugetlb_folio(struct hstate *h,
> > destroy_compound_gigantic_folio(folio, huge_page_order(h));
> > free_gigantic_folio(folio, huge_page_order(h));
> > } else {
> > - __free_pages(&folio->page, huge_page_order(h));
> > + INIT_LIST_HEAD(&folio->_deferred_list);
>
> Will it be better to add a comment to explain why INIT_LIST_HEAD is needed ?
Maybe? Something like
/* We reused this space for our own purposes */
> > + folio_put(folio);
>
> Can all __free_pages be replaced with folio_put in mm/hugetlb.c?
There's only one left, and indeed it can!
I'll drop this into my tree and send it as a proper patch later.
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 333f6278ef63..43cc7e6bc374 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2177,13 +2177,13 @@ static struct folio *alloc_buddy_hugetlb_folio(struct hstate *h,
nodemask_t *node_alloc_noretry)
{
int order = huge_page_order(h);
- struct page *page;
+ struct folio *folio;
bool alloc_try_hard = true;
bool retry = true;
/*
- * By default we always try hard to allocate the page with
- * __GFP_RETRY_MAYFAIL flag. However, if we are allocating pages in
+ * By default we always try hard to allocate the folio with
+ * __GFP_RETRY_MAYFAIL flag. However, if we are allocating folios in
* a loop (to adjust global huge page counts) and previous allocation
* failed, do not continue to try hard on the same node. Use the
* node_alloc_noretry bitmap to manage this state information.
@@ -2196,43 +2196,42 @@ static struct folio *alloc_buddy_hugetlb_folio(struct hstate *h,
if (nid == NUMA_NO_NODE)
nid = numa_mem_id();
retry:
- page = __alloc_pages(gfp_mask, order, nid, nmask);
+ folio = __folio_alloc(gfp_mask, order, nid, nmask);
- /* Freeze head page */
- if (page && !page_ref_freeze(page, 1)) {
- __free_pages(page, order);
+ if (folio && !folio_ref_freeze(folio, 1)) {
+ folio_put(folio);
if (retry) { /* retry once */
retry = false;
goto retry;
}
/* WOW! twice in a row. */
- pr_warn("HugeTLB head page unexpected inflated ref count\n");
- page = NULL;
+ pr_warn("HugeTLB unexpected inflated folio ref count\n");
+ folio = NULL;
}
/*
- * If we did not specify __GFP_RETRY_MAYFAIL, but still got a page this
- * indicates an overall state change. Clear bit so that we resume
- * normal 'try hard' allocations.
+ * If we did not specify __GFP_RETRY_MAYFAIL, but still got a
+ * folio this indicates an overall state change. Clear bit so
+ * that we resume normal 'try hard' allocations.
*/
- if (node_alloc_noretry && page && !alloc_try_hard)
+ if (node_alloc_noretry && folio && !alloc_try_hard)
node_clear(nid, *node_alloc_noretry);
/*
- * If we tried hard to get a page but failed, set bit so that
+ * If we tried hard to get a folio but failed, set bit so that
* subsequent attempts will not try as hard until there is an
* overall state change.
*/
- if (node_alloc_noretry && !page && alloc_try_hard)
+ if (node_alloc_noretry && !folio && alloc_try_hard)
node_set(nid, *node_alloc_noretry);
- if (!page) {
+ if (!folio) {
__count_vm_event(HTLB_BUDDY_PGALLOC_FAIL);
return NULL;
}
__count_vm_event(HTLB_BUDDY_PGALLOC);
- return page_folio(page);
+ return folio;
}
static struct folio *__alloc_fresh_hugetlb_folio(struct hstate *h,
