xentrace: Add missing help option

Describe the --reserve-disk-space option in the xentrace help.

Signed-off-by: George Dunlap <george.dunlap@eu.citrix.com>

diff --git a/tools/xentrace/xentrace.c b/tools/xentrace/xentrace.c
index db652a2283b410d6aa6ebf87613b3dcc6ee415af..dd5471a3e97a86d3cc0c0c62f1b80c4d20092a01 100644 (file)
--- a/tools/xentrace/xentrace.c
+++ b/tools/xentrace/xentrace.c
@@ -804,6 +804,9 @@ static void usage(void)
 "  -V, --version           Print program version\n" \
 "  -M, --memory-buffer=b   Copy trace records to a circular memory buffer.\n" \
 "                          Dump to file on exit.\n" \
+"  -r  --reserve-disk-space=n Before writing trace records to disk, check to see\n" \
+"                          that after the write there will be at least n space\n" \
+"                          left on the disk.\n" \
 "\n" \
 "This tool is used to capture trace buffer data from Xen. The\n" \
 "data is output in a binary format, in the following order:\n" \