linux-kernel - [RFC 37/43] shmem: PKRAM: enable bulk loading of preserved pages into shmem

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Date:   Wed,  6 May 2020 17:42:03 -0700
From:   Anthony Yznaga <anthony.yznaga@...cle.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     willy@...radead.org, corbet@....net, tglx@...utronix.de,
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Subject: [RFC 37/43] shmem: PKRAM: enable bulk loading of preserved pages into shmem

Make use of new interfaces for loading and inserting preserved pages
into a shmem file in bulk.

Signed-off-by: Anthony Yznaga <anthony.yznaga@...cle.com>
---
 mm/shmem_pkram.c | 23 +++++++++++++++++------
 1 file changed, 17 insertions(+), 6 deletions(-)

diff --git a/mm/shmem_pkram.c b/mm/shmem_pkram.c
index 4992b6c3e54e..435488368104 100644
--- a/mm/shmem_pkram.c
+++ b/mm/shmem_pkram.c
@@ -315,18 +315,29 @@ static inline void pkram_load_report_one_done(void)
 static int do_load_file_content(struct pkram_stream *ps)
 {
 	unsigned long index;
-	struct page *page;
-	int err = 0;
+	int i, err;
+
+	err = pkram_prepare_load_pages(ps);
+	if (err)
+		return err;
 
 	do {
-		page = pkram_load_page(ps, &index, NULL);
-		if (!page)
+		err = pkram_load_pages(ps, &index);
+		if (err) {
+			if (err == -ENODATA)
+				err = 0;
 			break;
+		}
 
-		err = shmem_insert_page(ps->mm, ps->mapping->host, index, page);
-		put_page(page);
+		err = shmem_insert_pages(ps->mm, ps->mapping->host, index,
+					 ps->pages, ps->nr_pages);
+
+		for (i = 0; i < ps->nr_pages; i++)
+			put_page(ps->pages[i]);
 	} while (!err);
 
+	pkram_finish_load_pages(ps);
+
 	return err;
 }
 
-- 
2.13.3