linux-kernel - [PATCH v2 04/15] s390: pgtable: add statistics for PUD and P4D level page table

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Message-Id: <64401d867f3a965f60e9c8d09099b42f21749a47.1734526570.git.zhengqi.arch@bytedance.com>
Date: Wed, 18 Dec 2024 21:04:40 +0800
From: Qi Zheng <zhengqi.arch@...edance.com>
To: peterz@...radead.org,
	tglx@...utronix.de,
	david@...hat.com,
	jannh@...gle.com,
	hughd@...gle.com,
	yuzhao@...gle.com,
	willy@...radead.org,
	muchun.song@...ux.dev,
	vbabka@...nel.org,
	lorenzo.stoakes@...cle.com,
	akpm@...ux-foundation.org,
	rientjes@...gle.com,
	vishal.moola@...il.com
Cc: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Qi Zheng <zhengqi.arch@...edance.com>,
	linux-s390@...r.kernel.org
Subject: [PATCH v2 04/15] s390: pgtable: add statistics for PUD and P4D level page table

Like PMD and PTE level page table, also add statistics for PUD and P4D
page table.

Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
Suggested-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: linux-s390@...r.kernel.org
---
 arch/s390/include/asm/pgalloc.h | 29 +++++++++++++++++++-------
 arch/s390/include/asm/tlb.h     | 37 +++++++++++++++++----------------
 2 files changed, 40 insertions(+), 26 deletions(-)

diff --git a/arch/s390/include/asm/pgalloc.h b/arch/s390/include/asm/pgalloc.h
index 7b84ef6dc4b6d..a0c1ca5d8423c 100644
--- a/arch/s390/include/asm/pgalloc.h
+++ b/arch/s390/include/asm/pgalloc.h
@@ -53,29 +53,42 @@ static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long address)
 {
 	unsigned long *table = crst_table_alloc(mm);
 
-	if (table)
-		crst_table_init(table, _REGION2_ENTRY_EMPTY);
+	if (!table)
+		return NULL;
+	crst_table_init(table, _REGION2_ENTRY_EMPTY);
+	pagetable_p4d_ctor(virt_to_ptdesc(table));
+
 	return (p4d_t *) table;
 }
 
 static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
 {
-	if (!mm_p4d_folded(mm))
-		crst_table_free(mm, (unsigned long *) p4d);
+	if (mm_p4d_folded(mm))
+		return;
+
+	pagetable_p4d_dtor(virt_to_ptdesc(p4d));
+	crst_table_free(mm, (unsigned long *) p4d);
 }
 
 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
 {
 	unsigned long *table = crst_table_alloc(mm);
-	if (table)
-		crst_table_init(table, _REGION3_ENTRY_EMPTY);
+
+	if (!table)
+		return NULL;
+	crst_table_init(table, _REGION3_ENTRY_EMPTY);
+	pagetable_pud_ctor(virt_to_ptdesc(table));
+
 	return (pud_t *) table;
 }
 
 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
 {
-	if (!mm_pud_folded(mm))
-		crst_table_free(mm, (unsigned long *) pud);
+	if (mm_pud_folded(mm))
+		return;
+
+	pagetable_pud_dtor(virt_to_ptdesc(pud));
+	crst_table_free(mm, (unsigned long *) pud);
 }
 
 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
diff --git a/arch/s390/include/asm/tlb.h b/arch/s390/include/asm/tlb.h
index e95b2c8081eb8..b946964afce8e 100644
--- a/arch/s390/include/asm/tlb.h
+++ b/arch/s390/include/asm/tlb.h
@@ -110,24 +110,6 @@ static inline void pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
 	tlb_remove_ptdesc(tlb, pmd);
 }
 
-/*
- * p4d_free_tlb frees a pud table and clears the CRSTE for the
- * region second table entry from the tlb.
- * If the mm uses a four level page table the single p4d is freed
- * as the pgd. p4d_free_tlb checks the asce_limit against 8PB
- * to avoid the double free of the p4d in this case.
- */
-static inline void p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d,
-				unsigned long address)
-{
-	if (mm_p4d_folded(tlb->mm))
-		return;
-	__tlb_adjust_range(tlb, address, PAGE_SIZE);
-	tlb->mm->context.flush_mm = 1;
-	tlb->freed_tables = 1;
-	tlb_remove_ptdesc(tlb, p4d);
-}
-
 /*
  * pud_free_tlb frees a pud table and clears the CRSTE for the
  * region third table entry from the tlb.
@@ -140,11 +122,30 @@ static inline void pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
 {
 	if (mm_pud_folded(tlb->mm))
 		return;
+	pagetable_pud_dtor(virt_to_ptdesc(pud));
 	tlb->mm->context.flush_mm = 1;
 	tlb->freed_tables = 1;
 	tlb->cleared_p4ds = 1;
 	tlb_remove_ptdesc(tlb, pud);
 }
 
+/*
+ * p4d_free_tlb frees a p4d table and clears the CRSTE for the
+ * region second table entry from the tlb.
+ * If the mm uses a four level page table the single p4d is freed
+ * as the pgd. p4d_free_tlb checks the asce_limit against 8PB
+ * to avoid the double free of the p4d in this case.
+ */
+static inline void p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d,
+				unsigned long address)
+{
+	if (mm_p4d_folded(tlb->mm))
+		return;
+	pagetable_p4d_dtor(virt_to_ptdesc(p4d));
+	__tlb_adjust_range(tlb, address, PAGE_SIZE);
+	tlb->mm->context.flush_mm = 1;
+	tlb->freed_tables = 1;
+	tlb_remove_ptdesc(tlb, p4d);
+}
 
 #endif /* _S390_TLB_H */
-- 
2.20.1