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From: Peter Xu <peterx@redhat.com>
To: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Cc: peterx@redhat.com, Jason Gunthorpe <jgg@ziepe.ca>,
	John Hubbard <jhubbard@nvidia.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Christoph Hellwig <hch@lst.de>, Yang Shi <shy828301@gmail.com>,
	Oleg Nesterov <oleg@redhat.com>,
	Kirill Tkhai <ktkhai@virtuozzo.com>,
	Kirill Shutemov <kirill@shutemov.name>,
	Hugh Dickins <hughd@google.com>, Jann Horn <jannh@google.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Michal Hocko <mhocko@suse.com>, Jan Kara <jack@suse.cz>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Leon Romanovsky <leonro@nvidia.com>
Subject: [PATCH v2 2/4] mm/fork: Pass new vma pointer into copy_page_range()
Date: Fri, 25 Sep 2020 18:25:58 -0400	[thread overview]
Message-ID: <20200925222600.6832-3-peterx@redhat.com> (raw)
In-Reply-To: <20200925222600.6832-1-peterx@redhat.com>

This prepares for the future work to trigger early cow on pinned pages during
fork().  No functional change intended.

Signed-off-by: Peter Xu <peterx@redhat.com>
---
 include/linux/mm.h |  2 +-
 kernel/fork.c      |  2 +-
 mm/memory.c        | 14 +++++++++-----
 3 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index b2f370f0b420..ae914be004b3 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1646,7 +1646,7 @@ struct mmu_notifier_range;
 void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
 		unsigned long end, unsigned long floor, unsigned long ceiling);
 int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
-			struct vm_area_struct *vma);
+		    struct vm_area_struct *vma, struct vm_area_struct *new);
 int follow_pte_pmd(struct mm_struct *mm, unsigned long address,
 		   struct mmu_notifier_range *range,
 		   pte_t **ptepp, pmd_t **pmdpp, spinlock_t **ptlp);
diff --git a/kernel/fork.c b/kernel/fork.c
index e65d8192d080..da8d360fb032 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -589,7 +589,7 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm,
 
 		mm->map_count++;
 		if (!(tmp->vm_flags & VM_WIPEONFORK))
-			retval = copy_page_range(mm, oldmm, mpnt);
+			retval = copy_page_range(mm, oldmm, mpnt, tmp);
 
 		if (tmp->vm_ops && tmp->vm_ops->open)
 			tmp->vm_ops->open(tmp);
diff --git a/mm/memory.c b/mm/memory.c
index e315b1f1ef08..4c56d7b92b0e 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -819,6 +819,7 @@ copy_present_pte(struct mm_struct *dst_mm, struct mm_struct *src_mm,
 
 static int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
 		   pmd_t *dst_pmd, pmd_t *src_pmd, struct vm_area_struct *vma,
+		   struct vm_area_struct *new,
 		   unsigned long addr, unsigned long end)
 {
 	pte_t *orig_src_pte, *orig_dst_pte;
@@ -889,6 +890,7 @@ static int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
 
 static inline int copy_pmd_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
 		pud_t *dst_pud, pud_t *src_pud, struct vm_area_struct *vma,
+		struct vm_area_struct *new,
 		unsigned long addr, unsigned long end)
 {
 	pmd_t *src_pmd, *dst_pmd;
@@ -915,7 +917,7 @@ static inline int copy_pmd_range(struct mm_struct *dst_mm, struct mm_struct *src
 		if (pmd_none_or_clear_bad(src_pmd))
 			continue;
 		if (copy_pte_range(dst_mm, src_mm, dst_pmd, src_pmd,
-						vma, addr, next))
+				   vma, new, addr, next))
 			return -ENOMEM;
 	} while (dst_pmd++, src_pmd++, addr = next, addr != end);
 	return 0;
@@ -923,6 +925,7 @@ static inline int copy_pmd_range(struct mm_struct *dst_mm, struct mm_struct *src
 
 static inline int copy_pud_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
 		p4d_t *dst_p4d, p4d_t *src_p4d, struct vm_area_struct *vma,
+		struct vm_area_struct *new,
 		unsigned long addr, unsigned long end)
 {
 	pud_t *src_pud, *dst_pud;
@@ -949,7 +952,7 @@ static inline int copy_pud_range(struct mm_struct *dst_mm, struct mm_struct *src
 		if (pud_none_or_clear_bad(src_pud))
 			continue;
 		if (copy_pmd_range(dst_mm, src_mm, dst_pud, src_pud,
-						vma, addr, next))
+				   vma, new, addr, next))
 			return -ENOMEM;
 	} while (dst_pud++, src_pud++, addr = next, addr != end);
 	return 0;
@@ -957,6 +960,7 @@ static inline int copy_pud_range(struct mm_struct *dst_mm, struct mm_struct *src
 
 static inline int copy_p4d_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
 		pgd_t *dst_pgd, pgd_t *src_pgd, struct vm_area_struct *vma,
+		struct vm_area_struct *new,
 		unsigned long addr, unsigned long end)
 {
 	p4d_t *src_p4d, *dst_p4d;
@@ -971,14 +975,14 @@ static inline int copy_p4d_range(struct mm_struct *dst_mm, struct mm_struct *src
 		if (p4d_none_or_clear_bad(src_p4d))
 			continue;
 		if (copy_pud_range(dst_mm, src_mm, dst_p4d, src_p4d,
-						vma, addr, next))
+				   vma, new, addr, next))
 			return -ENOMEM;
 	} while (dst_p4d++, src_p4d++, addr = next, addr != end);
 	return 0;
 }
 
 int copy_page_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
-		struct vm_area_struct *vma)
+		    struct vm_area_struct *vma, struct vm_area_struct *new)
 {
 	pgd_t *src_pgd, *dst_pgd;
 	unsigned long next;
@@ -1033,7 +1037,7 @@ int copy_page_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
 		if (pgd_none_or_clear_bad(src_pgd))
 			continue;
 		if (unlikely(copy_p4d_range(dst_mm, src_mm, dst_pgd, src_pgd,
-					    vma, addr, next))) {
+					    vma, new, addr, next))) {
 			ret = -ENOMEM;
 			break;
 		}
-- 
2.26.2


  parent reply	other threads:[~2020-09-25 22:26 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-25 22:25 [PATCH v2 0/4] mm: Break COW for pinned pages during fork() Peter Xu
2020-09-25 22:25 ` [PATCH v2 1/4] mm: Introduce mm_struct.has_pinned Peter Xu
2020-09-25 22:25 ` Peter Xu [this message]
2020-09-30 13:30   ` [PATCH v2 2/4] mm/fork: Pass new vma pointer into copy_page_range() Kirill A. Shutemov
2020-09-30 17:05     ` Peter Xu
2020-09-25 22:25 ` [PATCH v2 3/4] mm: Do early cow for pinned pages during fork() for ptes Peter Xu
2020-09-26 23:23   ` Jason Gunthorpe
2020-09-27  0:04     ` Linus Torvalds
2020-09-25 22:26 ` [PATCH v2 4/4] mm/thp: Split huge pmds/puds if they're pinned when fork() Peter Xu
2020-09-27 19:35 ` [PATCH v2 0/4] mm: Break COW for pinned pages during fork() Linus Torvalds
2020-09-29 11:02   ` Leon Romanovsky

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