path: root/Documentation/trace
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authorMasami Hiramatsu <mhiramat@redhat.com>2010-07-05 15:54:45 -0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2010-07-05 15:54:45 -0300
commite09c8614b32915c16f68e039ac7040e602d73e35 (patch)
tree725c768b1d2fbd569e447e7d4a2044dc0aa7a1d5 /Documentation/trace
parent167a58f10d9cd1bdf6a911aa1eecbdff596de156 (diff)
tracing/kprobes: Support "string" type
Support string type tracing and printing in kprobe-tracer. This allows user to trace string data in kernel including __user data. Note that sometimes __user data may not be accessed if it is paged-out (sorry, but kprobes operation should be done in atomic, we can not wait for page-in). Commiter note: Fixed up conflicts with b7e2ece. Cc: Ingo Molnar <mingo@elte.hu> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <20100519195724.2885.18788.stgit@localhost6.localdomain6> Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'Documentation/trace')
1 files changed, 1 insertions, 1 deletions
diff --git a/Documentation/trace/kprobetrace.txt b/Documentation/trace/kprobetrace.txt
index ec94748ae65b..5f77d94598dd 100644
--- a/Documentation/trace/kprobetrace.txt
+++ b/Documentation/trace/kprobetrace.txt
@@ -42,7 +42,7 @@ Synopsis of kprobe_events
+|-offs(FETCHARG) : Fetch memory at FETCHARG +|- offs address.(**)
NAME=FETCHARG : Set NAME as the argument name of FETCHARG.
FETCHARG:TYPE : Set TYPE as the type of FETCHARG. Currently, basic types
- (u8/u16/u32/u64/s8/s16/s32/s64) are supported.
+ (u8/u16/u32/u64/s8/s16/s32/s64) and string are supported.
(*) only for return probe.
(**) this is useful for fetching a field of data structures.