X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=Documentation%2Ffilesystems%2Frelay.txt;h=510b722667ac885cf7abed3732961941a5ad1c14;hb=cdce1f0931831cebfbeb811a266a2f4adf5c8a35;hp=18d23f9a18c74663e1a7cbcc07232e7879945c5e;hpb=8269cc4e2b0ddcdcb9e7f2034c464ef8613737a1;p=linux-2.6-omap-h63xx.git

diff --git a/Documentation/filesystems/relay.txt b/Documentation/filesystems/relay.txt
index 18d23f9a18c..510b722667a 100644
--- a/Documentation/filesystems/relay.txt
+++ b/Documentation/filesystems/relay.txt
@@ -140,7 +140,7 @@ close()     decrements the channel buffer's refcount.  When the refcount
 In order for a user application to make use of relay files, the
 host filesystem must be mounted.  For example,
 
-	mount -t debugfs debugfs /debug
+	mount -t debugfs debugfs /sys/kernel/debug
 
 NOTE:   the host filesystem doesn't need to be mounted for kernel
 	clients to create or use channels - it only needs to be
@@ -294,6 +294,16 @@ user-defined data with a channel, and is immediately available
 (including in create_buf_file()) via chan->private_data or
 buf->chan->private_data.
 
+Buffer-only channels
+--------------------
+
+These channels have no files associated and can be created with
+relay_open(NULL, NULL, ...). Such channels are useful in scenarios such
+as when doing early tracing in the kernel, before the VFS is up. In these
+cases, one may open a buffer-only channel and then call
+relay_late_setup_files() when the kernel is ready to handle files,
+to expose the buffered data to the userspace.
+
 Channel 'modes'
 ---------------