Commit e09c8614 authored Jul 05, 2010 by Masami Hiramatsu Committed by Arnaldo Carvalho de Melo Jul 05, 2010

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 b7e2ecef.

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>

parent 167a58f1

Documentation/trace/kprobetrace.txt

+1 −1

Original line number	Diff line number	Diff line
		@@ -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.

kernel/trace/trace_kprobe.c

+292 −78

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