staging: erofs: add trace points for reading zipped data

This patch adds trace points for reading zipped data.

Signed-off-by: Chen Gong <[e-mail]>
Reviewed-by: Chao Yu <[e-mail]>
Reviewed-by: Gao Xiang <[e-mail]>
Signed-off-by: Gao Xiang <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/erofs/include/trace/events/erofs.h

···
 
 	TP_printk("dev = (%d,%d), nid = %llu, la %llu llen %llu flags %s",
 		  show_dev_nid(__entry),
-		  __entry->la, __entry->llen, show_map_flags(__entry->flags))
+		  __entry->la, __entry->llen,
+		  __entry->flags ? show_map_flags(__entry->flags) : "NULL")
 );
 
 DEFINE_EVENT(erofs__map_blocks_enter, erofs_map_blocks_flatmode_enter,
 	TP_PROTO(struct inode *inode, struct erofs_map_blocks *map,
 		 unsigned flags),
+
+	TP_ARGS(inode, map, flags)
+);
+
+DEFINE_EVENT(erofs__map_blocks_enter, z_erofs_map_blocks_iter_enter,
+	TP_PROTO(struct inode *inode, struct erofs_map_blocks *map,
+		 unsigned int flags),
 
 	TP_ARGS(inode, map, flags)
 );
···
 
 	TP_printk("dev = (%d,%d), nid = %llu, flags %s "
 		  "la %llu pa %llu llen %llu plen %llu mflags %s ret %d",
-		  show_dev_nid(__entry), show_map_flags(__entry->flags),
+		  show_dev_nid(__entry),
+		  __entry->flags ? show_map_flags(__entry->flags) : "NULL",
 		  __entry->la, __entry->pa, __entry->llen, __entry->plen,
 		  show_mflags(__entry->mflags), __entry->ret)
 );
···
 DEFINE_EVENT(erofs__map_blocks_exit, erofs_map_blocks_flatmode_exit,
 	TP_PROTO(struct inode *inode, struct erofs_map_blocks *map,
 		 unsigned flags, int ret),
+
+	TP_ARGS(inode, map, flags, ret)
+);
+
+DEFINE_EVENT(erofs__map_blocks_exit, z_erofs_map_blocks_iter_exit,
+	TP_PROTO(struct inode *inode, struct erofs_map_blocks *map,
+		 unsigned int flags, int ret),
 
 	TP_ARGS(inode, map, flags, ret)
 );

drivers/staging/erofs/unzip_vle.c

···
 #include "unzip_vle.h"
 #include <linux/prefetch.h>
 
+#include <trace/events/erofs.h>
+
 static struct workqueue_struct *z_erofs_workqueue __read_mostly;
 static struct kmem_cache *z_erofs_workgroup_cachep __read_mostly;
 
···
 	enum z_erofs_page_type page_type;
 	unsigned int cur, end, spiltted, index;
 	int err = 0;
+
+	trace_erofs_readpage(page, false);
 
 	/* register locked file pages as online pages in pack */
 	z_erofs_onlinepage_init(page);
···
 	struct page *head = NULL;
 	LIST_HEAD(pagepool);
 
+	trace_erofs_readpages(mapping->host, lru_to_page(pages),
+			      nr_pages, false);
+
 #if (EROFS_FS_ZIP_CACHE_LVL >= 2)
 	f.cachedzone_la = (erofs_off_t)lru_to_page(pages)->index << PAGE_SHIFT;
 #endif
···
 	unsigned int cluster_type, logical_cluster_ofs;
 	int err = 0;
 
+	trace_z_erofs_map_blocks_iter_enter(inode, map, flags);
+
 	/* when trying to read beyond EOF, leave it unmapped */
 	if (unlikely(map->m_la >= inode->i_size)) {
 		DBG_BUGON(!initial);
···
 	debugln("%s, m_la %llu m_pa %llu m_llen %llu m_plen %llu m_flags 0%o",
 		__func__, map->m_la, map->m_pa,
 		map->m_llen, map->m_plen, map->m_flags);
+
+	trace_z_erofs_map_blocks_iter_exit(inode, map, flags, err);
 
 	/* aggressively BUG_ON iff CONFIG_EROFS_FS_DEBUG is on */
 	DBG_BUGON(err < 0 && err != -ENOMEM);