ktest.pl: Add MAIL_MAX_SIZE to limit the amount of log emailed

Add the ktest config option MAIL_MAX_SIZE that will limit the size of the
log file that is placed into the email on failure.

Link: https://lore.kernel.org/r/20200701231756.790637968@goodmis.org

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/tools/testing/ktest/sample.conf b/tools/testing/ktest/sample.conf
index cb8227fbd01e..5e7d1d729752 100644
--- a/tools/testing/ktest/sample.conf
+++ b/tools/testing/ktest/sample.conf
@@ -442,6 +442,19 @@
 # Users can cancel the test by Ctrl^C
 # (default 0)
 #EMAIL_WHEN_CANCELED = 1
+#
+# If a test ends with an error and EMAIL_ON_ERROR is set as well
+# as a LOG_FILE is defined, then the log of the failing test will
+# be included in the email that is sent.
+# It is possible that the log may be very large, in which case,
+# only the last amount of the log should be sent. To limit how
+# much of the log is sent, set MAIL_MAX_SIZE. This will be the
+# size in bytes of the last portion of the log of the failed
+# test file. That is, if this is set to 100000, then only the
+# last 100 thousand bytes of the log file will be included in
+# the email.
+# (default undef)
+#MAIL_MAX_SIZE = 1000000
 
 # Start a test setup. If you leave this off, all options
 # will be default and the test will run once.