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[PATCH v20210111 08/39] xl: fix description of migrate --debug

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@xxxxxxxxx>
 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 494a84ee13..e6e4e8e83a 100644
--- a/docs/man/xl.1.pod.in
+++ b/docs/man/xl.1.pod.in
@@ -481,7 +481,9 @@ 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 compared 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 da0473ddfb..a0567169bf 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 
       "                of the domain.\n"
       "-T              Show timestamps during the migration process.\n"
-      "--debug         Print huge (!) amount of debug during the migration 
+      "--debug         Verify transferred domU page data.\n"
       "-p              Do not unpause domain after migrating it.\n"
       "-D              Preserve the domain id"



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