To take advantage of optimizations when adding pages to the page cache
via shmem_insert_pages(), improve the likelihood that the pages array
passed to shmem_insert_pages() starts on an aligned index. Do this
when preserving pages by starting a new pkram_link page when the current
page is aligned and the next aligned page will not fit on the pkram_link
page.
Signed-off-by: Anthony Yznaga <anthony.yznaga@xxxxxxxxxx>
---
mm/pkram.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/mm/pkram.c b/mm/pkram.c
index b63b2a3958e7..3f43809c8a85 100644
--- a/mm/pkram.c
+++ b/mm/pkram.c
@@ -911,9 +911,20 @@ static int __pkram_save_page(struct pkram_access *pa, struct page *page,
{
struct pkram_data_stream *pds = &pa->pds;
struct pkram_link *link = pds->link;
+ int align, align_cnt;
+
+ if (PageTransHuge(page)) {
+ align = 1 << (HPAGE_PMD_ORDER + XA_CHUNK_SHIFT - (HPAGE_PMD_ORDER % XA_CHUNK_SHIFT));
+ align_cnt = align >> HPAGE_PMD_ORDER;
+ } else {
+ align = XA_CHUNK_SIZE;
+ align_cnt = XA_CHUNK_SIZE;
+ }
if (!link || pds->entry_idx >= PKRAM_LINK_ENTRIES_MAX ||
- index != pa->pages.next_index) {
+ index != pa->pages.next_index ||
+ (IS_ALIGNED(index, align) &&
+ (pds->entry_idx + align_cnt > PKRAM_LINK_ENTRIES_MAX))) {
link = pkram_new_link(pds, pa->ps->gfp_mask);
if (!link)
return -ENOMEM;
--
1.8.3.1
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