Re: [PATCH v3 2/7] hugetlb: split hugetlb_hstate_alloc_pages

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 





On 2024/1/2 21:12, Gang Li wrote:
1G and 2M huge pages have different allocation and initialization logic,
which leads to subtle differences in parallelization. Therefore, it is
appropriate to split hugetlb_hstate_alloc_pages into gigantic and
non-gigantic.

This patch has no functional changes.

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

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 2606135ec55e6..92448e747991d 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)

The name is so long, how about hugetlb_gigantic_pages_alloc_boot?

+{
+	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)

hugetlb_pages_alloc_boot?

+{
+	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)) {

It it unnecessary to reverse the condition. A little sime like following:

if (hstate_is_gigantic(h))
    /* gigantic pages */
else
    /* normal pages */

-		/*
-		 * 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)





[Index of Archives]     [Linux ARM Kernel]     [Linux ARM]     [Linux Omap]     [Fedora ARM]     [IETF Annouce]     [Bugtraq]     [Linux OMAP]     [Linux MIPS]     [eCos]     [Asterisk Internet PBX]     [Linux API]

  Powered by Linux