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tracing: Fix kconfig warning due to a typo 

Commit f3f096cfe ("tracing: Provide trace events interface for
uprobes") throws a warning about unmet dependencies.

The exact warning message is:
	warning: (UPROBE_EVENT) selects UPROBES which has unmet direct dependencies (UPROBE_EVENTS && PERF_EVENTS)

This is due to a typo in arch/Kconfig file. Fix similar typos in
the uprobetracer documentation.

Also add sample format of a uprobe event in the uprobetracer
documentation as suggested by Masami Hiramatsu.

Reported-by: Stephen Boyd <sboyd@codeaurora.org>
Reported-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Anton Arapov <anton@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20120508111126.21004.38285.sendpatchset@srdronam.in.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Srikar Dronamraju 2012-05-08 16:41:26 +05:30 committed by Ingo Molnar
parent f3f096cfed
commit ec83db0f78
2 changed files with 21 additions and 3 deletions
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22
Documentation/trace/uprobetracer.txt
View File

@ -5,7 +5,7 @@
Overview
--------
Uprobe based trace events are similar to kprobe based trace events.
To enable this feature, build your kernel with CONFIG_UPROBE_EVENTS=y.
To enable this feature, build your kernel with CONFIG_UPROBE_EVENT=y.
Similar to the kprobe-event tracer, this doesn't need to be activated via
current_tracer. Instead of that, add probe points via
@ -68,7 +68,25 @@ in the object. We can see the events that are registered by looking at the
uprobe_events file.
# cat uprobe_events
p:uprobes/p_zsh_0x46420 /bin/zsh:0x0000000000046420
p:uprobes/p_zsh_0x46420 /bin/zsh:0x00046420 arg1=%ip arg2=%ax
The format of events can be seen by viewing the file events/uprobes/p_zsh_0x46420/format
# cat events/uprobes/p_zsh_0x46420/format
name: p_zsh_0x46420
ID: 922
format:
field:unsigned short common_type; offset:0; size:2; signed:0;
field:unsigned char common_flags; offset:2; size:1; signed:0;
field:unsigned char common_preempt_count; offset:3; size:1; signed:0;
field:int common_pid; offset:4; size:4; signed:1;
field:int common_padding; offset:8; size:4; signed:1;
field:unsigned long __probe_ip; offset:12; size:4; signed:0;
field:u32 arg1; offset:16; size:4; signed:0;
field:u32 arg2; offset:20; size:4; signed:0;
print fmt: "(%lx) arg1=%lx arg2=%lx", REC->__probe_ip, REC->arg1, REC->arg2
Right after definition, each event is disabled by default. For tracing these
events, you need to enable it by:

2
arch/Kconfig
View File

@ -78,7 +78,7 @@ config OPTPROBES
config UPROBES
bool "Transparent user-space probes (EXPERIMENTAL)"
depends on UPROBE_EVENTS && PERF_EVENTS
depends on UPROBE_EVENT && PERF_EVENTS
default n
help
Uprobes is the user-space counterpart to kprobes: they