linux-kernel - [PATCH v3 6/7] hugetlb: parallelize 2M hugetlb allocation and initialization

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Date: Tue,  2 Jan 2024 21:12:48 +0800
From: Gang Li <gang.li@...ux.dev>
To: David Hildenbrand <david@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Mike Kravetz <mike.kravetz@...cle.com>,
	Muchun Song <muchun.song@...ux.dev>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tim Chen <tim.c.chen@...ux.intel.com>
Cc: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	ligang.bdlg@...edance.com,
	Gang Li <gang.li@...ux.dev>
Subject: [PATCH v3 6/7] hugetlb: parallelize 2M hugetlb allocation and initialization

By distributing both the allocation and the initialization tasks across
multiple threads, the initialization of 2M hugetlb will be faster,
thereby improving the boot speed.

Here are some test results:
        test          no patch(ms)   patched(ms)   saved
 ------------------- -------------- ------------- --------
  256c2t(4 node) 2M           3336          1051   68.52%
  128c1t(2 node) 2M           1943           716   63.15%

Signed-off-by: Gang Li <gang.li@...ux.dev>
---
 mm/hugetlb.c | 72 ++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 53 insertions(+), 19 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index a71bc1622b53b..d1629df5f399f 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -35,6 +35,7 @@
 #include <linux/delayacct.h>
 #include <linux/memory.h>
 #include <linux/mm_inline.h>
+#include <linux/padata.h>
 
 #include <asm/page.h>
 #include <asm/pgalloc.h>
@@ -3510,6 +3511,38 @@ static void __init hugetlb_hstate_alloc_pages_report(unsigned long allocated, st
 	}
 }
 
+static void __init hugetlb_alloc_node(unsigned long start, unsigned long end, void *arg)
+{
+	struct hstate *h = (struct hstate *)arg;
+	int i, num = end - start;
+	nodemask_t node_alloc_noretry;
+	unsigned long flags;
+	int next_nid_to_alloc = 0;
+
+	/* Bit mask controlling how hard we retry per-node allocations.*/
+	nodes_clear(node_alloc_noretry);
+
+	for (i = 0; i < num; ++i) {
+		struct folio *folio = alloc_pool_huge_folio(h, &node_states[N_MEMORY],
+						&node_alloc_noretry, &next_nid_to_alloc);
+		if (!folio)
+			break;
+		spin_lock_irqsave(&hugetlb_lock, flags);
+		__prep_account_new_huge_page(h, folio_nid(folio));
+		enqueue_hugetlb_folio(h, folio);
+		spin_unlock_irqrestore(&hugetlb_lock, flags);
+		cond_resched();
+	}
+}
+
+static void __init hugetlb_vmemmap_optimize_node(unsigned long start, unsigned long end, void *arg)
+{
+	struct hstate *h = (struct hstate *)arg;
+	int nid = start;
+
+	hugetlb_vmemmap_optimize_folios(h, &h->hugepage_freelists[nid]);
+}
+
 static unsigned long __init hugetlb_hstate_alloc_pages_gigantic(struct hstate *h)
 {
 	unsigned long i;
@@ -3529,26 +3562,27 @@ static unsigned long __init hugetlb_hstate_alloc_pages_gigantic(struct hstate *h
 
 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);
+	struct padata_mt_job job = {
+		.fn_arg		= h,
+		.align		= 1,
+		.numa_aware	= true
+	};
 
-	return i;
+	job.thread_fn	= hugetlb_alloc_node;
+	job.start	= 0;
+	job.size	= h->max_huge_pages;
+	job.min_chunk	= h->max_huge_pages / num_node_state(N_MEMORY) / 2;
+	job.max_threads	= num_node_state(N_MEMORY) * 2;
+	padata_do_multithreaded(&job);
+
+	job.thread_fn	= hugetlb_vmemmap_optimize_node;
+	job.start	= 0;
+	job.size	= num_node_state(N_MEMORY);
+	job.min_chunk	= 1;
+	job.max_threads	= num_node_state(N_MEMORY);
+	padata_do_multithreaded(&job);
+
+	return h->nr_huge_pages;
 }
 
 /*
-- 
2.20.1