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From:   Gang Li <ligang.bdlg@bytedance.com>
To:     Mike Kravetz <mike.kravetz@oracle.com>,
        Muchun Song <songmuchun@bytedance.com>,
        Andrew Morton <akpm@linux-foundation.org>
Cc:     Gang Li <ligang.bdlg@bytedance.com>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH v1] mm, hugetlb: skip irrelevant nodes in hugetlb_show_meminfo()
Date:   Wed, 22 Jun 2022 12:00:42 +0800
Message-Id: <20220622040043.25462-1-ligang.bdlg@bytedance.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

show_free_areas() allows to filter out node specific data which is
irrelevant to the allocation request. But hugetlb_show_meminfo() still
show hugetlb on all nodes, which is redundant and unnecessary.

Use show_mem_node_skip() to skip irrelevant nodes in
hugetlb_show_meminfo().

Signed-off-by: Gang Li <ligang.bdlg@bytedance.com>
---
 include/linux/hugetlb.h | 4 ++--
 include/linux/mm.h      | 1 +
 mm/hugetlb.c            | 7 +++++--
 mm/page_alloc.c         | 4 ++--
 4 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 642a39016f9a..1913ac6bf10a 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -155,7 +155,7 @@ void __unmap_hugepage_range_final(struct mmu_gather *tlb,
 			  struct page *ref_page, zap_flags_t zap_flags);
 void hugetlb_report_meminfo(struct seq_file *);
 int hugetlb_report_node_meminfo(char *buf, int len, int nid);
-void hugetlb_show_meminfo(void);
+void hugetlb_show_meminfo(unsigned int filter, nodemask_t *nodemask);
 unsigned long hugetlb_total_pages(void);
 vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
 			unsigned long address, unsigned int flags);
@@ -300,7 +300,7 @@ static inline int hugetlb_report_node_meminfo(char *buf, int len, int nid)
 	return 0;
 }
 
-static inline void hugetlb_show_meminfo(void)
+static inline void hugetlb_show_meminfo(unsigned int filter, nodemask_t *nodemask)
 {
 }
 
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 764dc0fdae5e..f72c1b21cde3 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1873,6 +1873,7 @@ extern void pagefault_out_of_memory(void);
  */
 #define SHOW_MEM_FILTER_NODES		(0x0001u)	/* disallowed nodes */
 
+extern bool show_mem_node_skip(unsigned int flags, int nid, nodemask_t *nodemask);
 extern void show_free_areas(unsigned int flags, nodemask_t *nodemask);
 
 #ifdef CONFIG_MMU
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 98492733cc64..632826e6fea5 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -4486,7 +4486,7 @@ int hugetlb_report_node_meminfo(char *buf, int len, int nid)
 			     nid, h->surplus_huge_pages_node[nid]);
 }
 
-void hugetlb_show_meminfo(void)
+void hugetlb_show_meminfo(unsigned int filter, nodemask_t *nodemask)
 {
 	struct hstate *h;
 	int nid;
@@ -4494,7 +4494,9 @@ void hugetlb_show_meminfo(void)
 	if (!hugepages_supported())
 		return;
 
-	for_each_node_state(nid, N_MEMORY)
+	for_each_node_state(nid, N_MEMORY) {
+		if (show_mem_node_skip(filter, nid, nodemask))
+			continue;
 		for_each_hstate(h)
 			pr_info("Node %d hugepages_total=%u hugepages_free=%u hugepages_surp=%u hugepages_size=%lukB\n",
 				nid,
@@ -4502,6 +4504,7 @@ void hugetlb_show_meminfo(void)
 				h->free_huge_pages_node[nid],
 				h->surplus_huge_pages_node[nid],
 				huge_page_size(h) / SZ_1K);
+	}
 }
 
 void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 84781094b478..5896b5a9101f 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5951,7 +5951,7 @@ void si_meminfo_node(struct sysinfo *val, int nid)
  * Determine whether the node should be displayed or not, depending on whether
  * SHOW_MEM_FILTER_NODES was passed to show_free_areas().
  */
-static bool show_mem_node_skip(unsigned int flags, int nid, nodemask_t *nodemask)
+bool show_mem_node_skip(unsigned int flags, int nid, nodemask_t *nodemask)
 {
 	if (!(flags & SHOW_MEM_FILTER_NODES))
 		return false;
@@ -6196,7 +6196,7 @@ void show_free_areas(unsigned int filter, nodemask_t *nodemask)
 		printk(KERN_CONT "= %lukB\n", K(total));
 	}
 
-	hugetlb_show_meminfo();
+	hugetlb_show_meminfo(filter, nodemask);
 
 	printk("%ld total pagecache pages\n", global_node_page_state(NR_FILE_PAGES));
 
-- 
2.20.1