linux/kernel/trace/trace_kprobe.c, branch v4.11

sched/headers: Prepare to use instead of in

2017-03-02T07:42:38Z

We don't actually need the full rculist.h header in sched.h anymore, we will be able to include the smaller rcupdate.h header instead. But first update code that relied on the implicit header inclusion. Acked-by: Linus Torvalds Cc: Mike Galbraith Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar

Merge tag 'trace-v4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

2017-02-27T21:26:17Z

Pull tracing updates from Steven Rostedt: "This release has no new tracing features, just clean ups, minor fixes and small optimizations" * tag 'trace-v4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (25 commits) tracing: Remove outdated ring buffer comment tracing/probes: Fix a warning message to show correct maximum length tracing: Fix return value check in trace_benchmark_reg() tracing: Use modern function declaration jump_label: Reduce the size of struct static_key tracing/probe: Show subsystem name in messages tracing/hwlat: Update old comment about migration timers: Make flags output in the timer_start tracepoint useful tracing: Have traceprobe_probes_write() not access userspace unnecessarily tracing: Have COMM event filter key be treated as a string ftrace: Have set_graph_function handle multiple functions in one write ftrace: Do not hold references of ftrace_graph_{notrace_}hash out of graph_lock tracing: Reset parser->buffer to allow multiple "puts" ftrace: Have set_graph_functions handle write with RDWR ftrace: Reset fgd->hash in ftrace_graph_write() ftrace: Replace (void *)1 with a meaningful macro name FTRACE_GRAPH_EMPTY ftrace: Create a slight optimization on searching the ftrace_hash tracing: Add ftrace_hash_key() helper function ftrace: Convert graph filter to use hash tables ftrace: Expose ftrace_hash_empty and ftrace_lookup_ip ...

tracing/probe: Show subsystem name in messages

2017-02-15T14:02:25Z

Show "trace_probe:", "trace_kprobe:" and "trace_uprobe:" headers for each warning/error/info message. This will help people to notice that kprobe/uprobe events caused those messages. Link: http://lkml.kernel.org/r/148646647813.24658.16705315294927615333.stgit@devbox Signed-off-by: Masami Hiramatsu Signed-off-by: Steven Rostedt (VMware)

tracing/kprobes: Fix __init annotation

2017-02-02T15:48:35Z

clang complains about "__init" being attached to a struct name: kernel/trace/trace_kprobe.c:1375:15: error: '__section__' attribute only applies to functions and global variables The intention must have been to mark the function as __init instead of the type, so move the attribute there. Link: http://lkml.kernel.org/r/20170201165826.2625888-1-arnd@arndb.de Fixes: f18f97ac43d7 ("tracing/kprobes: Add a helper method to return number of probe hits") Signed-off-by: Arnd Bergmann Signed-off-by: Steven Rostedt (VMware)

kprobes/trace: Fix kprobe selftest for newer gcc

2016-12-13T02:21:43Z

Commit 265a5b7ee3eb ("kprobes/trace: Fix kprobe selftest for gcc 4.6") has added __used attribute to kprobe_trace_selftest_target to ensure that the method is listed in kallsyms table. However, even though the method remains in the kernel image, the actual call is optimized away as there are no side effects and the return value is never checked. Add a return value check and a 'noinline' attribute to ensure that an inlined copy of the method is not used by the caller. Also add checks that verify that the kprobe was really hit, as at the moment the tests show positive results despite the test method being optimized away. Finally, add __init annotations to find_trace_probe_file() and kprobe_trace_selftest_target() as they are only called from within an __init method. Link: http://lkml.kernel.org/r/1481293178-3128-2-git-send-email-marcin.nowakowski@imgtec.com Acked-by: Masami Hiramatsu Signed-off-by: Marcin Nowakowski Signed-off-by: Steven Rostedt

tracing/kprobes: Add a helper method to return number of probe hits

2016-12-13T02:17:44Z

The number of probe hits is stored in a percpu variable and therefore can't be read directly. Add a helper method trace_kprobe_nhit() that performs the required calculation. It will be used in a follow-up commit that changes kprobe selftests to verify the number of probe hits. Link: http://lkml.kernel.org/r/1481293178-3128-1-git-send-email-marcin.nowakowski@imgtec.com Acked-by: Masami Hiramatsu Signed-off-by: Marcin Nowakowski Signed-off-by: Steven Rostedt

ftrace: kprobe: uprobe: Add x8/x16/x32/x64 for hexadecimal types

2016-08-23T18:38:09Z

Add x8/x16/x32/x64 for hexadecimal type casting to kprobe/uprobe event tracer. These type casts can be used for integer arguments for explicitly showing them in hexadecimal digits in formatted text. Signed-off-by: Masami Hiramatsu Acked-by: Steven Rostedt Cc: Alexander Shishkin Cc: Hemant Kumar Cc: Naohiro Aota Cc: Peter Zijlstra Cc: Wang Nan Link: http://lkml.kernel.org/r/147151067029.12957.11591314629326414783.stgit@devbox Signed-off-by: Arnaldo Carvalho de Melo

tracing: expose current->comm to [ku]probe events

2016-06-20T13:54:19Z

ftrace is very quick to give up on saving the task command line (see `trace_save_cmdline()`). The workaround for events which really care about the command line is to explicitly assign it as part of the entry. However, this doesn't work for kprobe events, as there's no straightforward way to get access to current->comm. Add a kprobe/uprobe event variable $comm which provides exactly that. Link: http://lkml.kernel.org/r/f59b472033b943a370f5f48d0af37698f409108f.1465435894.git.osandov@fb.com Acked-by: Masami Hiramatsu Signed-off-by: Omar Sandoval Signed-off-by: Steven Rostedt

perf: split perf_trace_buf_prepare into alloc and update parts

2016-04-08T01:04:26Z

split allows to move expensive update of 'struct trace_entry' to later phase. Repurpose unused 1st argument of perf_tp_event() to indicate event type. While splitting use temp variable 'rctx' instead of '*rctx' to avoid unnecessary loads done by the compiler due to -fno-strict-aliasing Signed-off-by: Alexei Starovoitov Acked-by: Peter Zijlstra (Intel) Signed-off-by: David S. Miller

kernel/...: convert pr_warning to pr_warn

2016-03-22T22:36:02Z

Use the more common logging method with the eventual goal of removing pr_warning altogether. Miscellanea: - Realign arguments - Coalesce formats - Add missing space between a few coalesced formats Signed-off-by: Joe Perches Acked-by: Rafael J. Wysocki [kernel/power/suspend.c] Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds