The patch titled
Subject: mm: pass pvec directly to find_get_entries
has been added to the -mm tree. Its filename is
mm-pass-pvec-directly-to-find_get_entries.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-pass-pvec-directly-to-find_get_entries.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-pass-pvec-directly-to-find_get_entries.patch
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------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Subject: mm: pass pvec directly to find_get_entries
All callers of find_get_entries() use a pvec, so pass it directly instead
of manipulating it in the caller.
Link: https://lkml.kernel.org/r/20201112212641.27837-14-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Reviewed-by: Jan Kara <jack@xxxxxxx>
Reviewed-by: William Kucharski <william.kucharski@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Dave Chinner <dchinner@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Yang Shi <yang.shi@xxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/pagemap.h | 3 +--
mm/filemap.c | 21 +++++++++------------
mm/shmem.c | 5 ++---
mm/swap.c | 4 +---
4 files changed, 13 insertions(+), 20 deletions(-)
--- a/include/linux/pagemap.h~mm-pass-pvec-directly-to-find_get_entries
+++ a/include/linux/pagemap.h
@@ -451,8 +451,7 @@ static inline struct page *find_subpage(
}
unsigned find_get_entries(struct address_space *mapping, pgoff_t start,
- pgoff_t end, unsigned int nr_entries, struct page **entries,
- pgoff_t *indices);
+ pgoff_t end, struct pagevec *pvec, pgoff_t *indices);
unsigned find_get_pages_range(struct address_space *mapping, pgoff_t *start,
pgoff_t end, unsigned int nr_pages,
struct page **pages);
--- a/mm/filemap.c~mm-pass-pvec-directly-to-find_get_entries
+++ a/mm/filemap.c
@@ -1871,14 +1871,12 @@ reset:
* @mapping: The address_space to search
* @start: The starting page cache index
* @end: The final page index (inclusive).
- * @nr_entries: The maximum number of entries
- * @entries: Where the resulting entries are placed
+ * @pvec: Where the resulting entries are placed.
* @indices: The cache indices corresponding to the entries in @entries
*
- * find_get_entries() will search for and return a group of up to
- * @nr_entries entries in the mapping. The entries are placed at
- * @entries. find_get_entries() takes a reference against any actual
- * pages it returns.
+ * find_get_entries() will search for and return a batch of entries in
+ * the mapping. The entries are placed in @pvec. find_get_entries()
+ * takes a reference on any actual pages it returns.
*
* The search returns a group of mapping-contiguous page cache entries
* with ascending indexes. There may be holes in the indices due to
@@ -1895,15 +1893,12 @@ reset:
* Return: the number of pages and shadow entries which were found.
*/
unsigned find_get_entries(struct address_space *mapping, pgoff_t start,
- pgoff_t end, unsigned int nr_entries, struct page **entries,
- pgoff_t *indices)
+ pgoff_t end, struct pagevec *pvec, pgoff_t *indices)
{
XA_STATE(xas, &mapping->i_pages, start);
struct page *page;
unsigned int ret = 0;
-
- if (!nr_entries)
- return 0;
+ unsigned nr_entries = PAGEVEC_SIZE;
rcu_read_lock();
while ((page = find_get_entry(&xas, end, XA_PRESENT))) {
@@ -1918,11 +1913,13 @@ unsigned find_get_entries(struct address
}
indices[ret] = xas.xa_index;
- entries[ret] = page;
+ pvec->pages[ret] = page;
if (++ret == nr_entries)
break;
}
rcu_read_unlock();
+
+ pvec->nr = ret;
return ret;
}
--- a/mm/shmem.c~mm-pass-pvec-directly-to-find_get_entries
+++ a/mm/shmem.c
@@ -965,9 +965,8 @@ static void shmem_undo_range(struct inod
while (index < end) {
cond_resched();
- pvec.nr = find_get_entries(mapping, index, end - 1,
- PAGEVEC_SIZE, pvec.pages, indices);
- if (!pvec.nr) {
+ if (!find_get_entries(mapping, index, end - 1, &pvec,
+ indices)) {
/* If all gone or hole-punch or unfalloc, we're done */
if (index == start || end != -1)
break;
--- a/mm/swap.c~mm-pass-pvec-directly-to-find_get_entries
+++ a/mm/swap.c
@@ -1102,9 +1102,7 @@ unsigned pagevec_lookup_entries(struct p
struct address_space *mapping, pgoff_t start, pgoff_t end,
pgoff_t *indices)
{
- pvec->nr = find_get_entries(mapping, start, end, PAGEVEC_SIZE,
- pvec->pages, indices);
- return pagevec_count(pvec);
+ return find_get_entries(mapping, start, end, pvec, indices);
}
/**
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxx are
mm-fix-readahead_page_batch-for-retry-entries.patch
mm-fix-madvise-willneed-performance-problem.patch
mm-page-flags-fix-comment.patch
mm-page_alloc-add-__free_pages-documentation.patch
mm-make-pagecache-tagged-lookups-return-only-head-pages.patch
mm-shmem-use-pagevec_lookup-in-shmem_unlock_mapping.patch
mm-swap-optimise-get_shadow_from_swap_cache.patch
mm-add-fgp_entry.patch
mm-filemap-rename-find_get_entry-to-mapping_get_entry.patch
mm-filemap-add-helper-for-finding-pages.patch
mm-filemap-add-mapping_seek_hole_data.patch
iomap-use-mapping_seek_hole_data.patch
mm-add-and-use-find_lock_entries.patch
mm-add-an-end-parameter-to-find_get_entries.patch
mm-add-an-end-parameter-to-pagevec_lookup_entries.patch
mm-remove-nr_entries-parameter-from-pagevec_lookup_entries.patch
mm-pass-pvec-directly-to-find_get_entries.patch
mm-remove-pagevec_lookup_entries.patch
mm-truncateshmem-handle-truncates-that-split-thps.patch
mm-filemap-return-only-head-pages-from-find_get_entries.patch
mm-introduce-memfd_secret-system-call-to-create-secret-memory-areas-fix.patch
