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From: Jan Kara <jack@suse.cz>
To: <linux-mm@kvack.org>
Cc: Mel Gorman <mgorman@suse.de>,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	<linux-fsdevel@vger.kernel.org>, Jan Kara <jack@suse.cz>
Subject: [PATCH 3/7] mm: Factor out page cache page freeing into a separate function
Date: Tue, 10 Oct 2017 17:19:33 +0200
Message-ID: <20171010151937.26984-4-jack@suse.cz> (raw)
In-Reply-To: <20171010151937.26984-1-jack@suse.cz>

Factor out page freeing from delete_from_page_cache() into a separate
function. We will need to call the same when batching pagecache deletion
operations.

invalidate_complete_page2() and replace_page_cache_page() might want to
call this function as well however they currently don't seem to handle
THPs so it's unnecessary for them to take the hit of checking whether
a page is THP or not.

Acked-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Jan Kara <jack@suse.cz>
---
 mm/filemap.c | 31 ++++++++++++++++++-------------
 1 file changed, 18 insertions(+), 13 deletions(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index cf74d0dacc6a..cdb44dacabd2 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -254,6 +254,23 @@ void __delete_from_page_cache(struct page *page, void *shadow)
 		account_page_cleaned(page, mapping, inode_to_wb(mapping->host));
 }
 
+static void page_cache_free_page(struct address_space *mapping,
+				struct page *page)
+{
+	void (*freepage)(struct page *);
+
+	freepage = mapping->a_ops->freepage;
+	if (freepage)
+		freepage(page);
+
+	if (PageTransHuge(page) && !PageHuge(page)) {
+		page_ref_sub(page, HPAGE_PMD_NR);
+		VM_BUG_ON_PAGE(page_count(page) <= 0, page);
+	} else {
+		put_page(page);
+	}
+}
+
 /**
  * delete_from_page_cache - delete page from page cache
  * @page: the page which the kernel is trying to remove from page cache
@@ -266,25 +283,13 @@ void delete_from_page_cache(struct page *page)
 {
 	struct address_space *mapping = page_mapping(page);
 	unsigned long flags;
-	void (*freepage)(struct page *);
 
 	BUG_ON(!PageLocked(page));
-
-	freepage = mapping->a_ops->freepage;
-
 	spin_lock_irqsave(&mapping->tree_lock, flags);
 	__delete_from_page_cache(page, NULL);
 	spin_unlock_irqrestore(&mapping->tree_lock, flags);
 
-	if (freepage)
-		freepage(page);
-
-	if (PageTransHuge(page) && !PageHuge(page)) {
-		page_ref_sub(page, HPAGE_PMD_NR);
-		VM_BUG_ON_PAGE(page_count(page) <= 0, page);
-	} else {
-		put_page(page);
-	}
+	page_cache_free_page(mapping, page);
 }
 EXPORT_SYMBOL(delete_from_page_cache);
 
-- 
2.12.3

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  parent reply index

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-10-10 15:19 [PATCH 0/7 v1] Speed up page cache truncation Jan Kara
2017-10-10 15:19 ` [PATCH 1/7] mm: Speedup cancel_dirty_page() for clean pages Jan Kara
2017-10-10 15:19 ` [PATCH 2/7] mm: Refactor truncate_complete_page() Jan Kara
2017-10-10 15:19 ` Jan Kara [this message]
2017-10-10 15:19 ` [PATCH 4/7] mm: Move accounting updates before page_cache_tree_delete() Jan Kara
2017-10-10 15:19 ` [PATCH 5/7] mm: Move clearing of page->mapping to page_cache_tree_delete() Jan Kara
2017-10-10 15:19 ` [PATCH 6/7] mm: Factor out checks and accounting from __delete_from_page_cache() Jan Kara
2017-10-10 15:19 ` [PATCH 7/7] mm: Batch radix tree operations when truncating pages Jan Kara
2017-10-11  7:39   ` Mel Gorman
2017-10-17 23:05   ` Andrew Morton
2017-10-18 10:44     ` Jan Kara
2017-10-10 17:25 ` [PATCH 0/7 v1] Speed up page cache truncation Andi Kleen
2017-10-11  8:06   ` Jan Kara
2017-10-11 16:51     ` Andi Kleen
2017-10-11 17:34     ` Dave Hansen
2017-10-11 17:59       ` Mel Gorman
2017-10-11 18:37         ` Andi Kleen
2017-10-11 21:06       ` Jan Kara
2017-10-11 21:24         ` Dave Chinner
2017-10-12  9:09           ` Mel Gorman
2017-10-12 14:07           ` Jan Kara
2017-10-17 16:21 [PATCH 0/7 v2] " Jan Kara
2017-10-17 16:21 ` [PATCH 3/7] mm: Factor out page cache page freeing into a separate function Jan Kara

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