[RFC PATCH v1 2/4] hugetlb: split hugetlb_hstate_alloc_pages

Gang Li
2023-11-23T13:36:39Z

From: Gang Li <ligang.bdlg@bytedance.com>

Split hugetlb_hstate_alloc_pages into gigantic and non-gigantic.

These patch has no functional changes.

Signed-off-by: Gang Li <ligang.bdlg@bytedance.com>
---
mm/hugetlb.c | 86 +++++++++++++++++++++++++++-------------------------
1 file changed, 45 insertions(+), 41 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 7af2ee08ad1b..7f9ff0855dd0 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3509,6 +3509,47 @@ static void __init hugetlb_hstate_alloc_pages_report(unsigned long allocated, st
}
}

+static unsigned long __init hugetlb_hstate_alloc_pages_gigantic(struct hstate *h)
+{
+ unsigned long i;
+
+ for (i = 0; i < h->max_huge_pages; ++i) {
+ /*
+ * gigantic pages not added to list as they are not
+ * added to pools now.
+ */
+ if (!alloc_bootmem_huge_page(h, NUMA_NO_NODE))
+ break;
+ cond_resched();
+ }
+
+ return i;
+}
+
+static unsigned long __init hugetlb_hstate_alloc_pages_non_gigantic(struct hstate *h)
+{
+ unsigned long i;
+ struct folio *folio;
+ LIST_HEAD(folio_list);
+ nodemask_t node_alloc_noretry;
+
+ /* Bit mask controlling how hard we retry per-node allocations.*/
+ nodes_clear(node_alloc_noretry);
+
+ for (i = 0; i < h->max_huge_pages; ++i) {
+ folio = alloc_pool_huge_folio(h, &node_states[N_MEMORY],
+ &node_alloc_noretry);
+ if (!folio)
+ break;
+ list_add(&folio->lru, &folio_list);
+ cond_resched();
+ }
+
+ prep_and_add_allocated_folios(h, &folio_list);
+
+ return i;
+}
+
/*
* NOTE: this routine is called in different contexts for gigantic and
* non-gigantic pages.
@@ -3522,10 +3563,7 @@ static void __init hugetlb_hstate_alloc_pages_report(unsigned long allocated, st
*/
static void __init hugetlb_hstate_alloc_pages(struct hstate *h)
{
- unsigned long i;
- struct folio *folio;
- LIST_HEAD(folio_list);
- nodemask_t *node_alloc_noretry;
+ unsigned long allocated;

/* skip gigantic hugepages allocation if hugetlb_cma enabled */
if (hstate_is_gigantic(h) && hugetlb_cma_size) {
@@ -3539,46 +3577,12 @@ static void __init hugetlb_hstate_alloc_pages(struct hstate *h)

/* below will do all node balanced alloc */
if (!hstate_is_gigantic(h)) {
- /*
- * Bit mask controlling how hard we retry per-node allocations.
- * Ignore errors as lower level routines can deal with
- * node_alloc_noretry == NULL. If this kmalloc fails at boot
- * time, we are likely in bigger trouble.
- */
- node_alloc_noretry = kmalloc(sizeof(*node_alloc_noretry),
- GFP_KERNEL);
+ allocated = hugetlb_hstate_alloc_pages_non_gigantic(h);
} else {
- /* allocations done at boot time */
- node_alloc_noretry = NULL;
- }
-
- /* bit mask controlling how hard we retry per-node allocations */
- if (node_alloc_noretry)
- nodes_clear(*node_alloc_noretry);
-
- for (i = 0; i < h->max_huge_pages; ++i) {
- if (hstate_is_gigantic(h)) {
- /*
- * gigantic pages not added to list as they are not
- * added to pools now.
- */
- if (!alloc_bootmem_huge_page(h, NUMA_NO_NODE))
- break;
- } else {
- folio = alloc_pool_huge_folio(h, &node_states[N_MEMORY],
- node_alloc_noretry);
- if (!folio)
- break;
- list_add(&folio->lru, &folio_list);
- }
- cond_resched();
+ allocated = hugetlb_hstate_alloc_pages_gigantic(h);
}

- /* list will be empty if hstate_is_gigantic */
- prep_and_add_allocated_folios(h, &folio_list);
-
- hugetlb_hstate_alloc_pages_report(i, h);
- kfree(node_alloc_noretry);
+ hugetlb_hstate_alloc_pages_report(allocated, h);
}

static void __init hugetlb_init_hstates(void)
--
2.20.1