From: Matthew Wilcox (Oracle) <willy@infradead.org>
Date: Fri, 23 Jul 2021 13:29:46 +0000 (-0400)
Subject: filemap: Convert tracing of page cache operations to folio
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=a0580c6f9babaf4413c8a7e2ab21d68e31f4c754;p=linux.git

filemap: Convert tracing of page cache operations to folio

Pass the folio instead of a page.  The page was already implicitly a
folio as it accessed page->mapping directly.  Add the order of the folio
to the tracepoint, as this is important information.  Also drop printing
the address of the struct page as the pfn provides better information
than the struct page address.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
---

diff --git a/include/trace/events/filemap.h b/include/trace/events/filemap.h
index c47b63db124e9..46c89c1e460c5 100644
--- a/include/trace/events/filemap.h
+++ b/include/trace/events/filemap.h
@@ -15,43 +15,45 @@
 
 DECLARE_EVENT_CLASS(mm_filemap_op_page_cache,
 
-	TP_PROTO(struct page *page),
+	TP_PROTO(struct folio *folio),
 
-	TP_ARGS(page),
+	TP_ARGS(folio),
 
 	TP_STRUCT__entry(
 		__field(unsigned long, pfn)
 		__field(unsigned long, i_ino)
 		__field(unsigned long, index)
 		__field(dev_t, s_dev)
+		__field(unsigned char, order)
 	),
 
 	TP_fast_assign(
-		__entry->pfn = page_to_pfn(page);
-		__entry->i_ino = page->mapping->host->i_ino;
-		__entry->index = page->index;
-		if (page->mapping->host->i_sb)
-			__entry->s_dev = page->mapping->host->i_sb->s_dev;
+		__entry->pfn = folio_pfn(folio);
+		__entry->i_ino = folio->mapping->host->i_ino;
+		__entry->index = folio->index;
+		if (folio->mapping->host->i_sb)
+			__entry->s_dev = folio->mapping->host->i_sb->s_dev;
 		else
-			__entry->s_dev = page->mapping->host->i_rdev;
+			__entry->s_dev = folio->mapping->host->i_rdev;
+		__entry->order = folio_order(folio);
 	),
 
-	TP_printk("dev %d:%d ino %lx page=%p pfn=0x%lx ofs=%lu",
+	TP_printk("dev %d:%d ino %lx pfn=0x%lx ofs=%lu order=%u",
 		MAJOR(__entry->s_dev), MINOR(__entry->s_dev),
 		__entry->i_ino,
-		pfn_to_page(__entry->pfn),
 		__entry->pfn,
-		__entry->index << PAGE_SHIFT)
+		__entry->index << PAGE_SHIFT,
+		__entry->order)
 );
 
 DEFINE_EVENT(mm_filemap_op_page_cache, mm_filemap_delete_from_page_cache,
-	TP_PROTO(struct page *page),
-	TP_ARGS(page)
+	TP_PROTO(struct folio *folio),
+	TP_ARGS(folio)
 	);
 
 DEFINE_EVENT(mm_filemap_op_page_cache, mm_filemap_add_to_page_cache,
-	TP_PROTO(struct page *page),
-	TP_ARGS(page)
+	TP_PROTO(struct folio *folio),
+	TP_ARGS(folio)
 	);
 
 TRACE_EVENT(filemap_set_wb_err,
diff --git a/mm/filemap.c b/mm/filemap.c
index 600b8c921a674..bcdc8bb4d2c8c 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -225,7 +225,7 @@ void __delete_from_page_cache(struct page *page, void *shadow)
 	struct folio *folio = page_folio(page);
 	struct address_space *mapping = page->mapping;
 
-	trace_mm_filemap_delete_from_page_cache(page);
+	trace_mm_filemap_delete_from_page_cache(folio);
 
 	filemap_unaccount_folio(mapping, folio);
 	page_cache_delete(mapping, folio, shadow);
@@ -346,9 +346,10 @@ void delete_from_page_cache_batch(struct address_space *mapping,
 	spin_lock(&mapping->host->i_lock);
 	xa_lock_irq(&mapping->i_pages);
 	for (i = 0; i < pagevec_count(pvec); i++) {
-		trace_mm_filemap_delete_from_page_cache(pvec->pages[i]);
+		struct folio *folio = page_folio(pvec->pages[i]);
 
-		filemap_unaccount_folio(mapping, page_folio(pvec->pages[i]));
+		trace_mm_filemap_delete_from_page_cache(folio);
+		filemap_unaccount_folio(mapping, folio);
 	}
 	page_cache_delete_batch(mapping, pvec);
 	xa_unlock_irq(&mapping->i_pages);
@@ -959,7 +960,7 @@ unlock:
 		goto error;
 	}
 
-	trace_mm_filemap_add_to_page_cache(&folio->page);
+	trace_mm_filemap_add_to_page_cache(folio);
 	return 0;
 error:
 	folio->mapping = NULL;