X-Git-Url: https://git.liburcu.org/?a=blobdiff_plain;f=src%2Fbin%2Flttng%2Fcommands%2Fadd_context.c;h=e823b1e6f18b8d383796ef22f5120044ef55c9df;hb=9b8f782029e40699f24bdb3a7630cd15ecc89f7e;hp=6483c9891d83038e929b3a1b96fd3f5cd6ab07c4;hpb=4309c447712b9bb2a6c1a285a6520fe115ce924d;p=lttng-tools.git

diff --git a/src/bin/lttng/commands/add_context.c b/src/bin/lttng/commands/add_context.c
index 6483c9891..e823b1e6f 100644
--- a/src/bin/lttng/commands/add_context.c
+++ b/src/bin/lttng/commands/add_context.c
@@ -322,6 +322,9 @@ static void usage(FILE *ofp)
 	fprintf(ofp, "                           TYPE can be one of the strings below:\n");
 	print_ctx_type(ofp);
 	fprintf(ofp, "\n");
+	fprintf(ofp, "Note that the vpid, vppid and vtid context types represent the virtual process id,\n"
+			"virtual parent process id and virtual thread id as seen from the current execution context\n"
+			"as opposed to the pid, ppid and tid which are kernel internal data structures.\n\n");
 	fprintf(ofp, "Example:\n");
 	fprintf(ofp, "This command will add the context information 'prio' and two perf\n"
 			"counters (hardware branch misses and cache misses), to all channels\n"