The patch titled
Subject: mm/rmap: rename COMPOUND_MAPPED to ENTIRELY_MAPPED
has been added to the -mm mm-unstable branch. Its filename is
mm-rmap-rename-compound_mapped-to-entirely_mapped.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-rmap-rename-compound_mapped-to-entirely_mapped.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: David Hildenbrand <david@xxxxxxxxxx>
Subject: mm/rmap: rename COMPOUND_MAPPED to ENTIRELY_MAPPED
Date: Wed, 20 Dec 2023 23:45:03 +0100
We removed all "bool compound" and RMAP_COMPOUND parameters. Let's remove
the remaining "compound" terminology by making COMPOUND_MAPPED match the
"folio->_entire_mapcount" terminology, renaming it to ENTIRELY_MAPPED.
ENTIRELY_MAPPED is only used when the whole folio is mapped using a single
page table entry (e.g., a single PMD mapping a PMD-sized THP). For now,
we don't support mapping any THP bigger than that, so ENTIRELY_MAPPED only
applies to PMD-mapped PMD-sized THP only.
Link: https://lkml.kernel.org/r/20231220224504.646757-40-david@xxxxxxxxxx
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Muchun Song <muchun.song@xxxxxxxxx>
Cc: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Cc: Peter Xu <peterx@xxxxxxxxxx>
Cc: Ryan Roberts <ryan.roberts@xxxxxxx>
Cc: Yin Fengwei <fengwei.yin@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/mm/transhuge.rst | 2 +-
mm/internal.h | 6 +++---
mm/rmap.c | 18 +++++++++---------
3 files changed, 13 insertions(+), 13 deletions(-)
--- a/Documentation/mm/transhuge.rst~mm-rmap-rename-compound_mapped-to-entirely_mapped
+++ a/Documentation/mm/transhuge.rst
@@ -117,7 +117,7 @@ pages:
- map/unmap of a PMD entry for the whole THP increment/decrement
folio->_entire_mapcount and also increment/decrement
- folio->_nr_pages_mapped by COMPOUND_MAPPED when _entire_mapcount
+ folio->_nr_pages_mapped by ENTIRELY_MAPPED when _entire_mapcount
goes from -1 to 0 or 0 to -1.
- map/unmap of individual pages with PTE entry increment/decrement
--- a/mm/internal.h~mm-rmap-rename-compound_mapped-to-entirely_mapped
+++ a/mm/internal.h
@@ -54,12 +54,12 @@ void page_writeback_init(void);
/*
* If a 16GB hugetlb folio were mapped by PTEs of all of its 4kB pages,
- * its nr_pages_mapped would be 0x400000: choose the COMPOUND_MAPPED bit
+ * its nr_pages_mapped would be 0x400000: choose the ENTIRELY_MAPPED bit
* above that range, instead of 2*(PMD_SIZE/PAGE_SIZE). Hugetlb currently
* leaves nr_pages_mapped at 0, but avoid surprise if it participates later.
*/
-#define COMPOUND_MAPPED 0x800000
-#define FOLIO_PAGES_MAPPED (COMPOUND_MAPPED - 1)
+#define ENTIRELY_MAPPED 0x800000
+#define FOLIO_PAGES_MAPPED (ENTIRELY_MAPPED - 1)
/*
* Flags passed to __show_mem() and show_free_areas() to suppress output in
--- a/mm/rmap.c~mm-rmap-rename-compound_mapped-to-entirely_mapped
+++ a/mm/rmap.c
@@ -1172,7 +1172,7 @@ static __always_inline unsigned int __fo
first = atomic_inc_and_test(&page->_mapcount);
if (first && folio_test_large(folio)) {
first = atomic_inc_return_relaxed(mapped);
- first = (first < COMPOUND_MAPPED);
+ first = (first < ENTIRELY_MAPPED);
}
if (first)
@@ -1182,15 +1182,15 @@ static __always_inline unsigned int __fo
case RMAP_LEVEL_PMD:
first = atomic_inc_and_test(&folio->_entire_mapcount);
if (first) {
- nr = atomic_add_return_relaxed(COMPOUND_MAPPED, mapped);
- if (likely(nr < COMPOUND_MAPPED + COMPOUND_MAPPED)) {
+ nr = atomic_add_return_relaxed(ENTIRELY_MAPPED, mapped);
+ if (likely(nr < ENTIRELY_MAPPED + ENTIRELY_MAPPED)) {
*nr_pmdmapped = folio_nr_pages(folio);
nr = *nr_pmdmapped - (nr & FOLIO_PAGES_MAPPED);
/* Raced ahead of a remove and another add? */
if (unlikely(nr < 0))
nr = 0;
} else {
- /* Raced ahead of a remove of COMPOUND_MAPPED */
+ /* Raced ahead of a remove of ENTIRELY_MAPPED */
nr = 0;
}
}
@@ -1433,7 +1433,7 @@ void folio_add_new_anon_rmap(struct foli
} else {
/* increment count (starts at -1) */
atomic_set(&folio->_entire_mapcount, 0);
- atomic_set(&folio->_nr_pages_mapped, COMPOUND_MAPPED);
+ atomic_set(&folio->_nr_pages_mapped, ENTIRELY_MAPPED);
SetPageAnonExclusive(&folio->page);
__lruvec_stat_mod_folio(folio, NR_ANON_THPS, nr);
}
@@ -1514,7 +1514,7 @@ static __always_inline void __folio_remo
last = atomic_add_negative(-1, &page->_mapcount);
if (last && folio_test_large(folio)) {
last = atomic_dec_return_relaxed(mapped);
- last = (last < COMPOUND_MAPPED);
+ last = (last < ENTIRELY_MAPPED);
}
if (last)
@@ -1524,15 +1524,15 @@ static __always_inline void __folio_remo
case RMAP_LEVEL_PMD:
last = atomic_add_negative(-1, &folio->_entire_mapcount);
if (last) {
- nr = atomic_sub_return_relaxed(COMPOUND_MAPPED, mapped);
- if (likely(nr < COMPOUND_MAPPED)) {
+ nr = atomic_sub_return_relaxed(ENTIRELY_MAPPED, mapped);
+ if (likely(nr < ENTIRELY_MAPPED)) {
nr_pmdmapped = folio_nr_pages(folio);
nr = nr_pmdmapped - (nr & FOLIO_PAGES_MAPPED);
/* Raced ahead of another remove and an add? */
if (unlikely(nr < 0))
nr = 0;
} else {
- /* An add of COMPOUND_MAPPED raced ahead */
+ /* An add of ENTIRELY_MAPPED raced ahead */
nr = 0;
}
}
_
Patches currently in -mm which might be from david@xxxxxxxxxx are
mm-rmap-rename-hugepage_add-to-hugetlb_add.patch
mm-rmap-introduce-and-use-hugetlb_remove_rmap.patch
mm-rmap-introduce-and-use-hugetlb_add_file_rmap.patch
mm-rmap-introduce-and-use-hugetlb_try_dup_anon_rmap.patch
mm-rmap-introduce-and-use-hugetlb_try_share_anon_rmap.patch
mm-rmap-add-hugetlb-sanity-checks-for-anon-rmap-handling.patch
mm-rmap-convert-folio_add_file_rmap_range-into-folio_add_file_rmap_.patch
mm-memory-page_add_file_rmap-folio_add_file_rmap_.patch
mm-huge_memory-page_add_file_rmap-folio_add_file_rmap_pmd.patch
mm-migrate-page_add_file_rmap-folio_add_file_rmap_pte.patch
mm-userfaultfd-page_add_file_rmap-folio_add_file_rmap_pte.patch
mm-rmap-remove-page_add_file_rmap.patch
mm-rmap-factor-out-adding-folio-mappings-into-__folio_add_rmap.patch
mm-rmap-introduce-folio_add_anon_rmap_.patch
mm-huge_memory-batch-rmap-operations-in-__split_huge_pmd_locked.patch
mm-huge_memory-page_add_anon_rmap-folio_add_anon_rmap_pmd.patch
mm-migrate-page_add_anon_rmap-folio_add_anon_rmap_pte.patch
mm-ksm-page_add_anon_rmap-folio_add_anon_rmap_pte.patch
mm-swapfile-page_add_anon_rmap-folio_add_anon_rmap_pte.patch
mm-memory-page_add_anon_rmap-folio_add_anon_rmap_pte.patch
mm-rmap-remove-page_add_anon_rmap.patch
mm-rmap-remove-rmap_compound.patch
mm-rmap-introduce-folio_remove_rmap_.patch
kernel-events-uprobes-page_remove_rmap-folio_remove_rmap_pte.patch
mm-huge_memory-page_remove_rmap-folio_remove_rmap_pmd.patch
mm-khugepaged-page_remove_rmap-folio_remove_rmap_pte.patch
mm-ksm-page_remove_rmap-folio_remove_rmap_pte.patch
mm-memory-page_remove_rmap-folio_remove_rmap_pte.patch
mm-migrate_device-page_remove_rmap-folio_remove_rmap_pte.patch
mm-rmap-page_remove_rmap-folio_remove_rmap_pte.patch
documentation-stop-referring-to-page_remove_rmap.patch
mm-rmap-remove-page_remove_rmap.patch
mm-rmap-convert-page_dup_file_rmap-to-folio_dup_file_rmap_.patch
mm-rmap-introduce-folio_try_dup_anon_rmap_.patch
mm-huge_memory-page_try_dup_anon_rmap-folio_try_dup_anon_rmap_pmd.patch
mm-memory-page_try_dup_anon_rmap-folio_try_dup_anon_rmap_pte.patch
mm-rmap-remove-page_try_dup_anon_rmap.patch
mm-convert-page_try_share_anon_rmap-to-folio_try_share_anon_rmap_.patch
mm-rmap-rename-compound_mapped-to-entirely_mapped.patch
mm-remove-one-last-reference-to-page_add__rmap.patch
