diff mbox series

[v13,062/137] mm/migrate: Add folio_migrate_copy()

Message ID 20210712030701.4000097-63-willy@infradead.org (mailing list archive)
State New, archived
Headers show
Series Memory folios | expand

Commit Message

Matthew Wilcox July 12, 2021, 3:05 a.m. UTC 
Combine the THP, hugetlb and base page routines together into a simple
loop.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 include/linux/migrate.h |  1 +
 mm/folio-compat.c       |  6 ++++
 mm/migrate.c            | 67 +++++++----------------------------------
 3 files changed, 18 insertions(+), 56 deletions(-)

Comments

kernel test robot July 12, 2021, 7:58 a.m. UTC | #1 
Hi "Matthew,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.14-rc1]
[cannot apply to hnaz-linux-mm/master xfs-linux/for-next tip/perf/core next-20210712]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Matthew-Wilcox-Oracle/Memory-folios/20210712-122232
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git e73f0f0ee7541171d89f2e2491130c7771ba58d3
config: x86_64-randconfig-a016-20210711 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/77c68764f249872680c6df4fbd6deab13b128b19
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Matthew-Wilcox-Oracle/Memory-folios/20210712-122232
        git checkout 77c68764f249872680c6df4fbd6deab13b128b19
        # save the attached .config to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   ld: mm/hugetlb.o: in function `hugetlb_mcopy_atomic_pte':
>> hugetlb.c:(.text+0x487e): undefined reference to `copy_huge_page'

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
diff mbox series

Patch

diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index b9cd88915c6b..e8db1d87f1f1 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -53,6 +53,7 @@  extern int migrate_page_move_mapping(struct address_space *mapping,
 		struct page *newpage, struct page *page, int extra_count);
 extern void copy_huge_page(struct page *dst, struct page *src);
 void folio_migrate_flags(struct folio *newfolio, struct folio *folio);
+void folio_migrate_copy(struct folio *newfolio, struct folio *folio);
 int folio_migrate_mapping(struct address_space *mapping,
 		struct folio *newfolio, struct folio *folio, int extra_count);
 #else
diff --git a/mm/folio-compat.c b/mm/folio-compat.c
index 3f00ad92d1ff..2ccd8f213fc4 100644
--- a/mm/folio-compat.c
+++ b/mm/folio-compat.c
@@ -64,4 +64,10 @@  void migrate_page_states(struct page *newpage, struct page *page)
 	folio_migrate_flags(page_folio(newpage), page_folio(page));
 }
 EXPORT_SYMBOL(migrate_page_states);
+
+void migrate_page_copy(struct page *newpage, struct page *page)
+{
+	folio_migrate_copy(page_folio(newpage), page_folio(page));
+}
+EXPORT_SYMBOL(migrate_page_copy);
 #endif
diff --git a/mm/migrate.c b/mm/migrate.c
index c16923052e13..942a5ce11f39 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -537,54 +537,6 @@  int migrate_huge_page_move_mapping(struct address_space *mapping,
 	return MIGRATEPAGE_SUCCESS;
 }
 
-/*
- * Gigantic pages are so large that we do not guarantee that page++ pointer
- * arithmetic will work across the entire page.  We need something more
- * specialized.
- */
-static void __copy_gigantic_page(struct page *dst, struct page *src,
-				int nr_pages)
-{
-	int i;
-	struct page *dst_base = dst;
-	struct page *src_base = src;
-
-	for (i = 0; i < nr_pages; ) {
-		cond_resched();
-		copy_highpage(dst, src);
-
-		i++;
-		dst = mem_map_next(dst, dst_base, i);
-		src = mem_map_next(src, src_base, i);
-	}
-}
-
-void copy_huge_page(struct page *dst, struct page *src)
-{
-	int i;
-	int nr_pages;
-
-	if (PageHuge(src)) {
-		/* hugetlbfs page */
-		struct hstate *h = page_hstate(src);
-		nr_pages = pages_per_huge_page(h);
-
-		if (unlikely(nr_pages > MAX_ORDER_NR_PAGES)) {
-			__copy_gigantic_page(dst, src, nr_pages);
-			return;
-		}
-	} else {
-		/* thp page */
-		BUG_ON(!PageTransHuge(src));
-		nr_pages = thp_nr_pages(src);
-	}
-
-	for (i = 0; i < nr_pages; i++) {
-		cond_resched();
-		copy_highpage(dst + i, src + i);
-	}
-}
-
 /*
  * Copy the flags and some other ancillary information
  */
@@ -661,16 +613,19 @@  void folio_migrate_flags(struct folio *newfolio, struct folio *folio)
 }
 EXPORT_SYMBOL(folio_migrate_flags);
 
-void migrate_page_copy(struct page *newpage, struct page *page)
+void folio_migrate_copy(struct folio *newfolio, struct folio *folio)
 {
-	if (PageHuge(page) || PageTransHuge(page))
-		copy_huge_page(newpage, page);
-	else
-		copy_highpage(newpage, page);
+	unsigned int i, nr = folio_nr_pages(folio);
 
-	migrate_page_states(newpage, page);
+	for (i = 0; i < nr; i++) {
+		/* folio_page() handles discontinuities in memmap */
+		copy_highpage(folio_page(newfolio, i), folio_page(folio, i));
+		cond_resched();
+	}
+
+	folio_migrate_flags(newfolio, folio);
 }
-EXPORT_SYMBOL(migrate_page_copy);
+EXPORT_SYMBOL(folio_migrate_copy);
 
 /************************************************************
  *                    Migration functions
@@ -698,7 +653,7 @@  int migrate_page(struct address_space *mapping,
 		return rc;
 
 	if (mode != MIGRATE_SYNC_NO_COPY)
-		migrate_page_copy(newpage, page);
+		folio_migrate_copy(newfolio, folio);
 	else
 		folio_migrate_flags(newfolio, folio);
 	return MIGRATEPAGE_SUCCESS;