linux-toradex.git/kernel/trace/trace_kprobe.c, branch v3.15-rc6

tracepoint: Use struct pointer instead of name hash for reg/unreg tracepoints

2014-04-09T00:43:28+00:00

Register/unregister tracepoint probes with struct tracepoint pointer
rather than tracepoint name.

This change, which vastly simplifies tracepoint.c, has been proposed by
Steven Rostedt. It also removes 8.8kB (mostly of text) to the vmlinux
size.

From this point on, the tracers need to pass a struct tracepoint pointer
to probe register/unregister. A probe can now only be connected to a
tracepoint that exists. Moreover, tracers are responsible for
unregistering the probe before the module containing its associated
tracepoint is unloaded.

   text    data     bss     dec     hex filename
10443444        4282528 10391552        25117524        17f4354 vmlinux.orig
10434930        4282848 10391552        25109330        17f2352 vmlinux

Link: http://lkml.kernel.org/r/1396992381-23785-2-git-send-email-mathieu.desnoyers@efficios.com

CC: Ingo Molnar 
CC: Frederic Weisbecker 
CC: Andrew Morton 
CC: Frank Ch. Eigler 
CC: Johannes Berg 
Signed-off-by: Mathieu Desnoyers 
[ SDR - fixed return val in void func in tracepoint_module_going() ]
Signed-off-by: Steven Rostedt

tracing/uprobes: Support ftrace_event_file base multibuffer

2014-02-20T17:30:09+00:00

Support multi-buffer on uprobe-based dynamic events by
using ftrace_event_file.

This patch is based kprobe-based dynamic events multibuffer
support work initially, commited by Masami(commit 41a7dd420c),
but revised as below:

Oleg changed the kprobe-based multibuffer design from
array-pointers of ftrace_event_file into simple list,
so this patch also change to the list design.

rcu_read_lock/unlock added into uprobe_trace_func/uretprobe_trace_func,
to synchronize with ftrace_event_file list add and delete.

Even though we allow multi-uprobes instances now,
but TP_FLAG_PROFILE/TP_FLAG_TRACE are still mutually exclusive
in probe_event_enable currently, this means we cannot allow
one user is using uprobe-tracer, and another user is using
perf-probe on same uprobe concurrently.
(Perhaps this will be fix in future, kprobe don't have this
limitation now)

Link: http://lkml.kernel.org/r/1389946120-19610-4-git-send-email-namhyung@kernel.org

Reviewed-by: Masami Hiramatsu 
Reviewed-by: Oleg Nesterov 
Cc: Ingo Molnar 
Cc: Frederic Weisbecker 
Cc: Srikar Dronamraju 
Signed-off-by: zhangwei(Jovi) 
Signed-off-by: Namhyung Kim 
Signed-off-by: Steven Rostedt

tracing: Consolidate event trigger code

2014-01-10T02:20:07+00:00

The event trigger code that checks for callback triggers before and
after recording of an event has lots of flags checks. This code is
duplicated throughout the ftrace events, kprobes and system calls.
They all do the exact same checks against the event flags.

Added helper functions ftrace_trigger_soft_disabled(),
event_trigger_unlock_commit() and event_trigger_unlock_commit_regs()
that consolidated the code and these are used instead.

Link: http://lkml.kernel.org/r/20140106222703.5e7dbba2@gandalf.local.home

Acked-by: Tom Zanussi 
Tested-by: Tom Zanussi 
Signed-off-by: Steven Rostedt

tracing/kprobes: Add trace event trigger invocations

2014-01-06T20:21:43+00:00

Add code to the kprobe/kretprobe event functions that will invoke any
event triggers associated with a probe's ftrace_event_file.

The code to do this is very similar to the invocation code already
used to invoke the triggers associated with static events and
essentially replaces the existing soft-disable checks with a superset
that preserves the original behavior but adds the bits needed to
support event triggers.

Link: http://lkml.kernel.org/r/f2d49f157b608070045fdb26c9564d5a05a5a7d0.1389036657.git.tom.zanussi@linux.intel.com

Acked-by: Masami Hiramatsu 
Signed-off-by: Tom Zanussi 
Signed-off-by: Steven Rostedt

tracing/uprobes: Add @+file_offset fetch method

2014-01-03T01:57:05+00:00

Enable to fetch data from a file offset.  Currently it only supports
fetching from same binary uprobe set.  It'll translate the file offset
to a proper virtual address in the process.

The syntax is "@+OFFSET" as it does similar to normal memory fetching
(@ADDR) which does no address translation.

Suggested-by: Oleg Nesterov 
Acked-by: Masami Hiramatsu 
Acked-by: Oleg Nesterov 
Cc: Srikar Dronamraju 
Cc: zhangwei(Jovi) 
Cc: Arnaldo Carvalho de Melo 
Signed-off-by: Namhyung Kim

tracing/probes: Implement 'memory' fetch method for uprobes

2014-01-02T21:17:43+00:00

Use separate method to fetch from memory.  Move existing functions to
trace_kprobe.c and make them static.  Also add new memory fetch
implementation for uprobes.

Acked-by: Masami Hiramatsu 
Acked-by: Oleg Nesterov 
Cc: Srikar Dronamraju 
Cc: zhangwei(Jovi) 
Cc: Arnaldo Carvalho de Melo 
Signed-off-by: Namhyung Kim

tracing/probes: Move 'symbol' fetch method to kprobes

2014-01-02T21:17:41+00:00

Move existing functions to trace_kprobe.c and add NULL entries to the
uprobes fetch type table.  I don't make them static since some generic
routines like update/free_XXX_fetch_param() require pointers to the
functions.

Acked-by: Oleg Nesterov 
Cc: Masami Hiramatsu 
Cc: Srikar Dronamraju 
Cc: zhangwei(Jovi) 
Cc: Arnaldo Carvalho de Melo 
Signed-off-by: Namhyung Kim

tracing/probes: Implement 'stack' fetch method for uprobes

2014-01-02T21:17:40+00:00

Use separate method to fetch from stack.  Move existing functions to
trace_kprobe.c and make them static.  Also add new stack fetch
implementation for uprobes.

Acked-by: Oleg Nesterov 
Cc: Masami Hiramatsu 
Cc: Srikar Dronamraju 
Cc: zhangwei(Jovi) 
Cc: Arnaldo Carvalho de Melo 
Signed-off-by: Namhyung Kim

tracing/probes: Split [ku]probes_fetch_type_table

2014-01-02T21:17:39+00:00

Use separate fetch_type_table for kprobes and uprobes.  It currently
shares all fetch methods but some of them will be implemented
differently later.

This is not to break build if [ku]probes is configured alone (like
!CONFIG_KPROBE_EVENT and CONFIG_UPROBE_EVENT).  So I added '__weak'
to the table declaration so that it can be safely omitted when it
configured out.

Acked-by: Oleg Nesterov 
Acked-by: Masami Hiramatsu 
Cc: Srikar Dronamraju 
Cc: zhangwei(Jovi) 
Cc: Arnaldo Carvalho de Melo 
Signed-off-by: Namhyung Kim

tracing/probes: Integrate duplicate set_print_fmt()

2014-01-02T21:17:38+00:00

The set_print_fmt() functions are implemented almost same for
[ku]probes.  Move it to a common place and get rid of the duplication.

Acked-by: Masami Hiramatsu 
Acked-by: Oleg Nesterov 
Cc: Srikar Dronamraju 
Cc: zhangwei(Jovi) 
Cc: Arnaldo Carvalho de Melo 
Signed-off-by: Namhyung Kim