[lttng-dev] [PATCH lttng-tools] Add vpid, vppid and vtid explanation in add-context help menu

[francis.deslauriers at efficios.com]

From: Francis Deslauriers <francis.deslauriers at efficios.com>

Signed-off-by: Francis Deslauriers <francis.deslauriers at efficios.com>
---
 src/bin/lttng/commands/add_context.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/bin/lttng/commands/add_context.c b/src/bin/lttng/commands/add_context.c
index 405b782..52d0db4 100644
--- a/src/bin/lttng/commands/add_context.c
+++ b/src/bin/lttng/commands/add_context.c
@@ -514,6 +514,9 @@ 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 oppose to the pid, ppid and tid that are kernel internal data structures.\n\n");
 	fprintf(ofp, "Example:\n");
 	fprintf(ofp, "This command will add the context information 'prio' and two per-cpu\n"
 			"perf counters (hardware branch misses and cache misses), to all channels\n"
-- 
1.8.3.2