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authorMasami Hiramatsu <mhiramat@kernel.org>2018-04-25 21:21:55 +0900
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2018-10-10 22:19:10 -0400
commit40b53b771806b1770837169cd32d1bf167fbccaf (patch)
treecd6a5bf5fee832a6169891ba07b347545dd03c47 /kernel/trace/trace.c
parent60c2e0cebfd01bd1bc5e8843f063264148d6b2bb (diff)
downloadlinux-40b53b771806b1770837169cd32d1bf167fbccaf.tar.bz2
tracing: probeevent: Add array type support
Add array type support for probe events. This allows user to get arraied types from memory address. The array type syntax is TYPE[N] Where TYPE is one of types (u8/16/32/64,s8/16/32/64, x8/16/32/64, symbol, string) and N is a fixed value less than 64. The string array type is a bit different from other types. For other base types, <base-type>[1] is equal to <base-type> (e.g. +0(%di):x32[1] is same as +0(%di):x32.) But string[1] is not equal to string. The string type itself represents "char array", but string array type represents "char * array". So, for example, +0(%di):string[1] is equal to +0(+0(%di)):string. Link: http://lkml.kernel.org/r/152465891533.26224.6150658225601339931.stgit@devbox Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace.c')
-rw-r--r--kernel/trace/trace.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 1e3f28b1fa07..e7f99f513959 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4627,7 +4627,8 @@ static const char readme_msg[] =
"\t fetcharg: %<register>, @<address>, @<symbol>[+|-<offset>],\n"
"\t $stack<index>, $stack, $retval, $comm\n"
"\t type: s8/16/32/64, u8/16/32/64, x8/16/32/64, string, symbol,\n"
- "\t b<bit-width>@<bit-offset>/<container-size>\n"
+ "\t b<bit-width>@<bit-offset>/<container-size>,\n"
+ "\t <type>\\[<array-size>\\]\n"
#endif
" events/\t\t- Directory containing all trace event subsystems:\n"
" enable\t\t- Write 0/1 to enable/disable tracing of all events\n"