Doc: document tracefile max size discarded event limitation

[lttng-tools.git] / src / bin / lttng / commands / enable_channels.c

diff --git a/src/bin/lttng/commands/enable_channels.c b/src/bin/lttng/commands/enable_channels.c
index c4bbc1170f30b17b5ed0935aa2348db43b8e986c..4a1de2c6636ecec72852f840cf23e704063b785c 100644 (file)
--- a/src/bin/lttng/commands/enable_channels.c
+++ b/src/bin/lttng/commands/enable_channels.c
@@ -136,6 +136,8 @@ static void usage(FILE *ofp)
        fprintf(ofp, "  -C, --tracefile-size SIZE\n");
        fprintf(ofp, "                           Maximum size of each tracefile within a stream (in bytes). 0 means unlimited.\n");
        fprintf(ofp, "                               (default: %u)\n", DEFAULT_CHANNEL_TRACEFILE_SIZE);
+       fprintf(ofp, "                           Note: traces generated with this option may inaccurately report\n");
+       fprintf(ofp, "                           discarded events as per CTF 1.8.\n");
        fprintf(ofp, "  -W, --tracefile-count COUNT\n");
        fprintf(ofp, "                           Used in conjunction with -C option, this will limit the number\n");
        fprintf(ofp, "                           of files created to the specified count. 0 means unlimited.\n");
@@ -169,7 +171,7 @@ static void set_default_attr(struct lttng_domain *dom)
        if (chan.attr.read_timer_interval == -1) {
                chan.attr.read_timer_interval = default_attr.read_timer_interval;
        }
-       if (chan.attr.output == -1) {
+       if ((int) chan.attr.output == -1) {
                chan.attr.output = default_attr.output;
        }
        if (chan.attr.tracefile_count == -1) {