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Message-Id: <20220308141437.144919-9-david@redhat.com>
Date: Tue, 8 Mar 2022 15:14:30 +0100
From: David Hildenbrand <david@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Hugh Dickins <hughd@...gle.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
David Rientjes <rientjes@...gle.com>,
Shakeel Butt <shakeelb@...gle.com>,
John Hubbard <jhubbard@...dia.com>,
Jason Gunthorpe <jgg@...dia.com>,
Mike Kravetz <mike.kravetz@...cle.com>,
Mike Rapoport <rppt@...ux.ibm.com>,
Yang Shi <shy828301@...il.com>,
"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
Matthew Wilcox <willy@...radead.org>,
Vlastimil Babka <vbabka@...e.cz>, Jann Horn <jannh@...gle.com>,
Michal Hocko <mhocko@...nel.org>,
Nadav Amit <namit@...are.com>, Rik van Riel <riel@...riel.com>,
Roman Gushchin <guro@...com>,
Andrea Arcangeli <aarcange@...hat.com>,
Peter Xu <peterx@...hat.com>,
Donald Dutile <ddutile@...hat.com>,
Christoph Hellwig <hch@....de>,
Oleg Nesterov <oleg@...hat.com>, Jan Kara <jack@...e.cz>,
Liang Zhang <zhangliang5@...wei.com>,
Pedro Gomes <pedrodemargomes@...il.com>,
Oded Gabbay <oded.gabbay@...il.com>, linux-mm@...ck.org,
David Hildenbrand <david@...hat.com>
Subject: [PATCH v1 08/15] mm/rmap: drop "compound" parameter from page_add_new_anon_rmap()
New anonymous pages are always mapped natively: only THP/khugepagd code
maps a new compound anonymous page and passes "true". Otherwise, we're
just dealing with simple, non-compound pages.
Let's give the interface clearer semantics and document these.
Signed-off-by: David Hildenbrand <david@...hat.com>
---
include/linux/rmap.h | 2 +-
kernel/events/uprobes.c | 2 +-
mm/huge_memory.c | 2 +-
mm/khugepaged.c | 2 +-
mm/memory.c | 10 +++++-----
mm/migrate.c | 2 +-
mm/rmap.c | 9 ++++++---
mm/swapfile.c | 2 +-
mm/userfaultfd.c | 2 +-
9 files changed, 18 insertions(+), 15 deletions(-)
diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index 94ee38829c63..51953bace0a3 100644
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -183,7 +183,7 @@ void page_move_anon_rmap(struct page *, struct vm_area_struct *);
void page_add_anon_rmap(struct page *, struct vm_area_struct *,
unsigned long, rmap_t);
void page_add_new_anon_rmap(struct page *, struct vm_area_struct *,
- unsigned long, bool);
+ unsigned long);
void page_add_file_rmap(struct page *, bool);
void page_remove_rmap(struct page *, bool);
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 6357c3580d07..b6fdb23fb3ea 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -184,7 +184,7 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr,
if (new_page) {
get_page(new_page);
- page_add_new_anon_rmap(new_page, vma, addr, false);
+ page_add_new_anon_rmap(new_page, vma, addr);
lru_cache_add_inactive_or_unevictable(new_page, vma);
} else
/* no new page, just dec_mm_counter for old_page */
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 2ca137e01e84..c1f7eaba23ff 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -647,7 +647,7 @@ static vm_fault_t __do_huge_pmd_anonymous_page(struct vm_fault *vmf,
entry = mk_huge_pmd(page, vma->vm_page_prot);
entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma);
- page_add_new_anon_rmap(page, vma, haddr, true);
+ page_add_new_anon_rmap(page, vma, haddr);
lru_cache_add_inactive_or_unevictable(page, vma);
pgtable_trans_huge_deposit(vma->vm_mm, vmf->pmd, pgtable);
set_pmd_at(vma->vm_mm, haddr, vmf->pmd, entry);
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index a325a646be33..96cc903c4788 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1183,7 +1183,7 @@ static void collapse_huge_page(struct mm_struct *mm,
spin_lock(pmd_ptl);
BUG_ON(!pmd_none(*pmd));
- page_add_new_anon_rmap(new_page, vma, address, true);
+ page_add_new_anon_rmap(new_page, vma, address);
lru_cache_add_inactive_or_unevictable(new_page, vma);
pgtable_trans_huge_deposit(mm, pmd, pgtable);
set_pmd_at(mm, address, pmd, _pmd);
diff --git a/mm/memory.c b/mm/memory.c
index e2d8e55c55c0..00c45b3a9576 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -896,7 +896,7 @@ copy_present_page(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma
*prealloc = NULL;
copy_user_highpage(new_page, page, addr, src_vma);
__SetPageUptodate(new_page);
- page_add_new_anon_rmap(new_page, dst_vma, addr, false);
+ page_add_new_anon_rmap(new_page, dst_vma, addr);
lru_cache_add_inactive_or_unevictable(new_page, dst_vma);
rss[mm_counter(new_page)]++;
@@ -3052,7 +3052,7 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf)
* some TLBs while the old PTE remains in others.
*/
ptep_clear_flush_notify(vma, vmf->address, vmf->pte);
- page_add_new_anon_rmap(new_page, vma, vmf->address, false);
+ page_add_new_anon_rmap(new_page, vma, vmf->address);
lru_cache_add_inactive_or_unevictable(new_page, vma);
/*
* We call the notify macro here because, when using secondary
@@ -3706,7 +3706,7 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
/* ksm created a completely new copy */
if (unlikely(page != swapcache && swapcache)) {
- page_add_new_anon_rmap(page, vma, vmf->address, false);
+ page_add_new_anon_rmap(page, vma, vmf->address);
lru_cache_add_inactive_or_unevictable(page, vma);
} else {
page_add_anon_rmap(page, vma, vmf->address, rmap_flags);
@@ -3856,7 +3856,7 @@ static vm_fault_t do_anonymous_page(struct vm_fault *vmf)
}
inc_mm_counter_fast(vma->vm_mm, MM_ANONPAGES);
- page_add_new_anon_rmap(page, vma, vmf->address, false);
+ page_add_new_anon_rmap(page, vma, vmf->address);
lru_cache_add_inactive_or_unevictable(page, vma);
setpte:
set_pte_at(vma->vm_mm, vmf->address, vmf->pte, entry);
@@ -4033,7 +4033,7 @@ void do_set_pte(struct vm_fault *vmf, struct page *page, unsigned long addr)
/* copy-on-write page */
if (write && !(vma->vm_flags & VM_SHARED)) {
inc_mm_counter_fast(vma->vm_mm, MM_ANONPAGES);
- page_add_new_anon_rmap(page, vma, addr, false);
+ page_add_new_anon_rmap(page, vma, addr);
lru_cache_add_inactive_or_unevictable(page, vma);
} else {
inc_mm_counter_fast(vma->vm_mm, mm_counter_file(page));
diff --git a/mm/migrate.c b/mm/migrate.c
index e6b3cb3d148b..fd9eba33b34a 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2725,7 +2725,7 @@ static void migrate_vma_insert_page(struct migrate_vma *migrate,
goto unlock_abort;
inc_mm_counter(mm, MM_ANONPAGES);
- page_add_new_anon_rmap(page, vma, addr, false);
+ page_add_new_anon_rmap(page, vma, addr);
if (!is_zone_device_page(page))
lru_cache_add_inactive_or_unevictable(page, vma);
get_page(page);
diff --git a/mm/rmap.c b/mm/rmap.c
index 7162689203fc..ebe7140c4493 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1184,19 +1184,22 @@ void page_add_anon_rmap(struct page *page,
}
/**
- * page_add_new_anon_rmap - add pte mapping to a new anonymous page
+ * page_add_new_anon_rmap - add mapping to a new anonymous page
* @page: the page to add the mapping to
* @vma: the vm area in which the mapping is added
* @address: the user virtual address mapped
- * @compound: charge the page as compound or small page
+ *
+ * If it's a compound page, it is accounted as a compound page. As the page
+ * is new, it's assume to get mapped exclusively by a single process.
*
* Same as page_add_anon_rmap but must only be called on *new* pages.
* This means the inc-and-test can be bypassed.
* Page does not have to be locked.
*/
void page_add_new_anon_rmap(struct page *page,
- struct vm_area_struct *vma, unsigned long address, bool compound)
+ struct vm_area_struct *vma, unsigned long address)
{
+ const bool compound = PageCompound(page);
int nr = compound ? thp_nr_pages(page) : 1;
VM_BUG_ON_VMA(address < vma->vm_start || address >= vma->vm_end, vma);
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 41ba8238d16b..7edc8e099b22 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1802,7 +1802,7 @@ static int unuse_pte(struct vm_area_struct *vma, pmd_t *pmd,
if (page == swapcache) {
page_add_anon_rmap(page, vma, addr, RMAP_NONE);
} else { /* ksm created a completely new copy */
- page_add_new_anon_rmap(page, vma, addr, false);
+ page_add_new_anon_rmap(page, vma, addr);
lru_cache_add_inactive_or_unevictable(page, vma);
}
set_pte_at(vma->vm_mm, addr, pte,
diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c
index 0780c2a57ff1..4ca854ce14f0 100644
--- a/mm/userfaultfd.c
+++ b/mm/userfaultfd.c
@@ -98,7 +98,7 @@ int mfill_atomic_install_pte(struct mm_struct *dst_mm, pmd_t *dst_pmd,
if (page_in_cache)
page_add_file_rmap(page, false);
else
- page_add_new_anon_rmap(page, dst_vma, dst_addr, false);
+ page_add_new_anon_rmap(page, dst_vma, dst_addr);
/*
* Must happen after rmap, as mm_counter() checks mapping (via
--
2.35.1
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