xfs: split the page fault trace event

Split the xfs_filemap_fault trace event into separate ones for read and
write faults and move them into the applicable locations.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>

Author: Christoph Hellwig

fs/xfs/xfs_file.c

@@ -1425,6 +1425,8 @@ xfs_dax_read_fault(
 	struct xfs_inode	*ip = XFS_I(file_inode(vmf->vma->vm_file));
 	vm_fault_t		ret;
 
+	trace_xfs_read_fault(ip, order);
+
 	xfs_ilock(ip, XFS_MMAPLOCK_SHARED);
 	ret = xfs_dax_fault_locked(vmf, order, false);
 	xfs_iunlock(ip, XFS_MMAPLOCK_SHARED);
@@ -1442,6 +1444,8 @@ xfs_write_fault(
 	unsigned int		lock_mode = XFS_MMAPLOCK_SHARED;
 	vm_fault_t		ret;
 
+	trace_xfs_write_fault(ip, order);
+
 	sb_start_pagefault(inode->i_sb);
 	file_update_time(vmf->vma->vm_file);
 
@@ -1485,12 +1489,12 @@ __xfs_filemap_fault(
 {
 	struct inode		*inode = file_inode(vmf->vma->vm_file);
 
-	trace_xfs_filemap_fault(XFS_I(inode), order, write_fault);
-
 	if (write_fault)
 		return xfs_write_fault(vmf, order);
 	if (IS_DAX(inode))
 		return xfs_dax_read_fault(vmf, order);
+
+	trace_xfs_read_fault(XFS_I(inode), order);
 	return filemap_fault(vmf);
 }
 

fs/xfs/xfs_trace.h

@@ -822,28 +822,32 @@ DEFINE_INODE_EVENT(xfs_inode_inactivating);
 TRACE_DEFINE_ENUM(XFS_REFC_DOMAIN_SHARED);
 TRACE_DEFINE_ENUM(XFS_REFC_DOMAIN_COW);
 
-TRACE_EVENT(xfs_filemap_fault,
-	TP_PROTO(struct xfs_inode *ip, unsigned int order, bool write_fault),
-	TP_ARGS(ip, order, write_fault),
+DECLARE_EVENT_CLASS(xfs_fault_class,
+	TP_PROTO(struct xfs_inode *ip, unsigned int order),
+	TP_ARGS(ip, order),
 	TP_STRUCT__entry(
 		__field(dev_t, dev)
 		__field(xfs_ino_t, ino)
 		__field(unsigned int, order)
-		__field(bool, write_fault)
 	),
 	TP_fast_assign(
 		__entry->dev = VFS_I(ip)->i_sb->s_dev;
 		__entry->ino = ip->i_ino;
 		__entry->order = order;
-		__entry->write_fault = write_fault;
 	),
-	TP_printk("dev %d:%d ino 0x%llx order %u write_fault %d",
+	TP_printk("dev %d:%d ino 0x%llx order %u",
 		  MAJOR(__entry->dev), MINOR(__entry->dev),
 		  __entry->ino,
-		  __entry->order,
-		  __entry->write_fault)
+		  __entry->order)
 )
 
+#define DEFINE_FAULT_EVENT(name) \
+DEFINE_EVENT(xfs_fault_class, name, \
+	TP_PROTO(struct xfs_inode *ip, unsigned int order), \
+	TP_ARGS(ip, order))
+DEFINE_FAULT_EVENT(xfs_read_fault);
+DEFINE_FAULT_EVENT(xfs_write_fault);
+
 DECLARE_EVENT_CLASS(xfs_iref_class,
 	TP_PROTO(struct xfs_inode *ip, unsigned long caller_ip),
 	TP_ARGS(ip, caller_ip),