[PATCH v1] xl: fix description of migrate --debug

[Olaf Hering <olaf@aepfle.de>]

xl migrate --debug used to track every pfn in every batch of pages.
But these times are gone. Adjust the help text to tell what --debug
is supposed to do today.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
---
 docs/man/xl.1.pod.in   | 4 +++-
 tools/xl/xl_cmdtable.c | 2 +-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/docs/man/xl.1.pod.in b/docs/man/xl.1.pod.in
index 4bde0672fa..d0f50f0b4a 100644
--- a/docs/man/xl.1.pod.in
+++ b/docs/man/xl.1.pod.in
@@ -488,7 +488,9 @@ Include timestamps in output.
 
 =item B<--debug>
 
-Display huge (!) amount of debug information during the migration process.
+Verify transferred domU page data. All memory will be transferred one more
+time to the destination host while the domU is paused, and compare with
+the result of the inital transfer while the domU was still running.
 
 =item B<-p>
 
diff --git a/tools/xl/xl_cmdtable.c b/tools/xl/xl_cmdtable.c
index fd2dc0aef2..af160dde42 100644
--- a/tools/xl/xl_cmdtable.c
+++ b/tools/xl/xl_cmdtable.c
@@ -168,7 +168,7 @@ struct cmd_spec cmd_table[] = {
       "-e              Do not wait in the background (on <host>) for the death\n"
       "                of the domain.\n"
       "-T              Show timestamps during the migration process.\n"
-      "--debug         Print huge (!) amount of debug during the migration process.\n"
+      "--debug         Verify transferred domU page data.\n"
       "-p              Do not unpause domain after migrating it.\n"
       "-D              Preserve the domain id"
     },