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| author | Masami Hiramatsu <mhiramat@kernel.org> | 2018-04-25 21:21:55 +0900 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2018-10-10 22:19:10 -0400 |
| commit | 40b53b771806b1770837169cd32d1bf167fbccaf (patch) | |
| tree | cd6a5bf5fee832a6169891ba07b347545dd03c47 /kernel/trace/trace.c | |
| parent | 60c2e0cebfd01bd1bc5e8843f063264148d6b2bb (diff) | |
| download | lwn-40b53b771806b1770837169cd32d1bf167fbccaf.tar.gz lwn-40b53b771806b1770837169cd32d1bf167fbccaf.zip | |
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.c | 3 |
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" |