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From: Kefeng Wang <wangkefeng.wang@huawei.com>
To: Andrew Morton <akpm@linux-foundation.org>, SeongJae Park <sj@kernel.org>
Cc: <damon@lists.linux.dev>, <linux-mm@kvack.org>,
	<vishal.moola@gmail.com>, <willy@infradead.org>,
	<david@redhat.com>, Kefeng Wang <wangkefeng.wang@huawei.com>
Subject: [PATCH -next v2 1/7] mm: page_idle: Convert page idle to use folios
Date: Tue, 27 Dec 2022 20:27:08 +0800	[thread overview]
Message-ID: <20221227122714.161224-2-wangkefeng.wang@huawei.com> (raw)
In-Reply-To: <20221227122714.161224-1-wangkefeng.wang@huawei.com>

Firtly, make page_idle_get_page() return a folio when successfully
grab a ref of a page, also rename it page_idle_get_folio(), then,
use it to covert page_idle_bitmap_read()/write() functions.

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
---
 mm/page_idle.c | 45 ++++++++++++++++++++++-----------------------
 1 file changed, 22 insertions(+), 23 deletions(-)

diff --git a/mm/page_idle.c b/mm/page_idle.c
index bc08332a609c..4f248e500e08 100644
--- a/mm/page_idle.c
+++ b/mm/page_idle.c
@@ -31,19 +31,20 @@
  *
  * This function tries to get a user memory page by pfn as described above.
  */
-static struct page *page_idle_get_page(unsigned long pfn)
+static struct folio *page_idle_get_folio(unsigned long pfn)
 {
 	struct page *page = pfn_to_online_page(pfn);
+	struct folio *folio;
 
-	if (!page || !PageLRU(page) ||
-	    !get_page_unless_zero(page))
+	if (!page || !PageLRU(page) || !get_page_unless_zero(page))
 		return NULL;
 
-	if (unlikely(!PageLRU(page))) {
-		put_page(page);
-		page = NULL;
+	folio = page_folio(page);
+	if (unlikely(!folio_test_lru(folio))) {
+		folio_put(folio);
+		folio = NULL;
 	}
-	return page;
+	return folio;
 }
 
 static bool page_idle_clear_pte_refs_one(struct folio *folio,
@@ -83,10 +84,8 @@ static bool page_idle_clear_pte_refs_one(struct folio *folio,
 	return true;
 }
 
-static void page_idle_clear_pte_refs(struct page *page)
+static void page_idle_clear_pte_refs(struct folio *folio)
 {
-	struct folio *folio = page_folio(page);
-
 	/*
 	 * Since rwc.try_lock is unused, rwc is effectively immutable, so we
 	 * can make it static to save some cycles and stack.
@@ -115,7 +114,7 @@ static ssize_t page_idle_bitmap_read(struct file *file, struct kobject *kobj,
 				     loff_t pos, size_t count)
 {
 	u64 *out = (u64 *)buf;
-	struct page *page;
+	struct folio *folio;
 	unsigned long pfn, end_pfn;
 	int bit;
 
@@ -134,19 +133,19 @@ static ssize_t page_idle_bitmap_read(struct file *file, struct kobject *kobj,
 		bit = pfn % BITMAP_CHUNK_BITS;
 		if (!bit)
 			*out = 0ULL;
-		page = page_idle_get_page(pfn);
-		if (page) {
-			if (page_is_idle(page)) {
+		folio = page_idle_get_folio(pfn);
+		if (folio) {
+			if (folio_test_idle(folio)) {
 				/*
 				 * The page might have been referenced via a
 				 * pte, in which case it is not idle. Clear
 				 * refs and recheck.
 				 */
-				page_idle_clear_pte_refs(page);
-				if (page_is_idle(page))
+				page_idle_clear_pte_refs(folio);
+				if (folio_test_idle(folio))
 					*out |= 1ULL << bit;
 			}
-			put_page(page);
+			folio_put(folio);
 		}
 		if (bit == BITMAP_CHUNK_BITS - 1)
 			out++;
@@ -160,7 +159,7 @@ static ssize_t page_idle_bitmap_write(struct file *file, struct kobject *kobj,
 				      loff_t pos, size_t count)
 {
 	const u64 *in = (u64 *)buf;
-	struct page *page;
+	struct folio *folio;
 	unsigned long pfn, end_pfn;
 	int bit;
 
@@ -178,11 +177,11 @@ static ssize_t page_idle_bitmap_write(struct file *file, struct kobject *kobj,
 	for (; pfn < end_pfn; pfn++) {
 		bit = pfn % BITMAP_CHUNK_BITS;
 		if ((*in >> bit) & 1) {
-			page = page_idle_get_page(pfn);
-			if (page) {
-				page_idle_clear_pte_refs(page);
-				set_page_idle(page);
-				put_page(page);
+			folio = page_idle_get_folio(pfn);
+			if (folio) {
+				page_idle_clear_pte_refs(folio);
+				folio_set_idle(folio);
+				folio_put(folio);
 			}
 		}
 		if (bit == BITMAP_CHUNK_BITS - 1)
-- 
2.35.3


  reply	other threads:[~2022-12-27 12:11 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-12-27 12:27 [PATCH -next v2 0/7] mm: convert page_idle/damon to use folios Kefeng Wang
2022-12-27 12:27 ` Kefeng Wang [this message]
2022-12-27 18:14   ` [PATCH -next v2 1/7] mm: page_idle: Convert page idle " Matthew Wilcox
2022-12-28  1:18     ` Kefeng Wang
2022-12-27 12:27 ` [PATCH -next v2 2/7] mm: damon: introduce damon_get_folio() Kefeng Wang
2022-12-27 19:42   ` SeongJae Park
2022-12-27 19:49     ` Matthew Wilcox
2022-12-27 21:38       ` SeongJae Park
2022-12-28  2:06     ` Kefeng Wang
2022-12-27 12:27 ` [PATCH -next v2 3/7] mm: damon: convert damon_ptep/pmdp_mkold() to use folios Kefeng Wang
2022-12-27 12:27 ` [PATCH -next v2 4/7] mm: damon: paddr: convert damon_pa_*() " Kefeng Wang
2022-12-27 19:50   ` SeongJae Park
2022-12-28  1:26     ` Kefeng Wang
2022-12-27 12:27 ` [PATCH -next v2 5/7] mm: damon: vaddr: convert damon_young_pmd_entry() to use folio Kefeng Wang
2022-12-27 12:27 ` [PATCH -next v2 6/7] mm: damon: remove unneed damon_get_page() Kefeng Wang
2022-12-27 12:27 ` [PATCH -next v2 7/7] mm: damon: vaddr: convert hugetlb related function to use folios Kefeng Wang

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