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authorMasami Hiramatsu <mhiramat@kernel.org>2016-08-18 17:59:21 +0900
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-08-23 17:06:38 -0300
commitbdca79c2bf40556b664c9b1c32aec103e9bdb4a9 (patch)
tree4795bda9e3982ce991d4d6f774f4f17b7e482f1b /Documentation/trace/kprobetrace.txt
parent9880ce4a69ba5c66a5ffdd711fe446bd0226bd8c (diff)
downloadop-kernel-dev-bdca79c2bf40556b664c9b1c32aec103e9bdb4a9.zip
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ftrace: kprobe: uprobe: Show u8/u16/u32/u64 types in decimal
Change kprobe/uprobe-tracer to show the arguments type-casted with u8/u16/u32/u64 in decimal digits instead of hexadecimal. To minimize compatibility issue, the arguments without type casting are typed by x64 (or x32 for 32bit arch) by default. Note: all arguments set by old perf probe without types are shown in decimal by default. Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Acked-by: Steven Rostedt <rostedt@goodmis.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Hemant Kumar <hemant@linux.vnet.ibm.com> Cc: Naohiro Aota <naohiro.aota@hgst.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/r/147151076135.12957.14684546093034343894.stgit@devbox Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'Documentation/trace/kprobetrace.txt')
-rw-r--r--Documentation/trace/kprobetrace.txt5
1 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/trace/kprobetrace.txt b/Documentation/trace/kprobetrace.txt
index 9109c8e..e4991fb 100644
--- a/Documentation/trace/kprobetrace.txt
+++ b/Documentation/trace/kprobetrace.txt
@@ -54,7 +54,10 @@ Types
-----
Several types are supported for fetch-args. Kprobe tracer will access memory
by given type. Prefix 's' and 'u' means those types are signed and unsigned
-respectively. Traced arguments are shown in decimal (signed) or hex (unsigned).
+respectively. 'x' prefix implies it is unsigned. Traced arguments are shown
+in decimal ('s' and 'u') or hexadecimal ('x'). Without type casting, 'x32'
+or 'x64' is used depends on the architecture (e.g. x86-32 uses x32, and
+x86-64 uses x64).
String type is a special type, which fetches a "null-terminated" string from
kernel space. This means it will fail and store NULL if the string container
has been paged out.
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