From: Adrian Hunter <adrian.hunter@intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
Borislav Petkov <bp@alien8.de>, "H . Peter Anvin" <hpa@zytor.com>,
x86@kernel.org, Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Mathieu Poirier <mathieu.poirier@linaro.org>,
Leo Yan <leo.yan@linaro.org>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Jiri Olsa <jolsa@redhat.com>,
linux-kernel@vger.kernel.org
Subject: [PATCH V3 08/13] ftrace: Add perf text poke events for ftrace trampolines
Date: Fri, 28 Feb 2020 15:51:20 +0200 [thread overview]
Message-ID: <20200228135125.567-9-adrian.hunter@intel.com> (raw)
In-Reply-To: <20200228135125.567-1-adrian.hunter@intel.com>
Add perf text poke events for ftrace trampolines when created and when
freed.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
arch/x86/kernel/ftrace.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
index 34e1dd495ce4..cec2ffae9e60 100644
--- a/arch/x86/kernel/ftrace.c
+++ b/arch/x86/kernel/ftrace.c
@@ -410,6 +410,8 @@ static void create_trampoline(struct ftrace_ops *ops)
ftrace_add_trampoline_to_kallsyms(ops);
perf_event_ksymbol(PERF_RECORD_KSYMBOL_TYPE_OOL, (u64)trampoline,
tramp_size, false, FTRACE_TRAMPOLINE_SYM);
+ /* Record the perf text poke event after the ksymbol register event */
+ perf_event_text_poke(trampoline, NULL, 0, trampoline, tramp_size);
set_vm_flush_reset_perms(trampoline);
@@ -537,6 +539,9 @@ void arch_ftrace_trampoline_free(struct ftrace_ops *ops)
if (!ops || !(ops->flags & FTRACE_OPS_FL_ALLOC_TRAMP))
return;
+ /* Record the text poke event before the ksymbol unregister event */
+ perf_event_text_poke((void *)ops->trampoline, (void *)ops->trampoline,
+ ops->trampoline_size, NULL, 0);
perf_event_ksymbol(PERF_RECORD_KSYMBOL_TYPE_OOL, (u64)ops->trampoline,
ops->trampoline_size, true, FTRACE_TRAMPOLINE_SYM);
/* Remove from kallsyms after the perf events */
--
2.17.1
next prev parent reply other threads:[~2020-02-28 13:52 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-28 13:51 [PATCH V3 00/13] perf/x86: Add perf text poke events Adrian Hunter
2020-02-28 13:51 ` [PATCH V3 01/13] perf: Add perf text poke event Adrian Hunter
2020-02-28 13:51 ` [PATCH V3 02/13] perf/x86: Add support for perf text poke event for text_poke_bp_batch() callers Adrian Hunter
2020-02-28 13:51 ` [PATCH V3 03/13] kprobes: Add symbols for kprobe insn pages Adrian Hunter
2020-02-28 14:36 ` Masami Hiramatsu
2020-02-28 17:20 ` Jiri Olsa
2020-02-28 18:51 ` Arnaldo Carvalho de Melo
2020-02-29 4:49 ` Masami Hiramatsu
2020-02-29 23:49 ` Steven Rostedt
2020-03-02 14:43 ` Jiri Olsa
2020-03-03 10:47 ` [OT] Pseudo module name in kallsyms (Re: [PATCH V3 03/13] kprobes: Add symbols for kprobe insn pages) Masami Hiramatsu
2020-03-03 10:55 ` Adrian Hunter
2020-03-03 14:21 ` Steven Rostedt
2020-03-03 15:40 ` Masami Hiramatsu
2020-02-28 13:51 ` [PATCH V3 04/13] kprobes: Add perf ksymbol events for kprobe insn pages Adrian Hunter
2020-02-28 15:11 ` Masami Hiramatsu
2020-02-29 3:51 ` Masami Hiramatsu
2020-02-28 13:51 ` [PATCH V3 05/13] perf/x86: Add perf text poke events for kprobes Adrian Hunter
2020-02-28 13:51 ` [PATCH V3 06/13] ftrace: Add symbols for ftrace trampolines Adrian Hunter
2020-02-28 16:27 ` Steven Rostedt
2020-02-28 13:51 ` [PATCH V3 07/13] ftrace: Add perf ksymbol events " Adrian Hunter
2020-02-28 13:51 ` Adrian Hunter [this message]
2020-02-28 13:51 ` [PATCH V3 09/13] perf kcore_copy: Fix module map when there are no modules loaded Adrian Hunter
2020-02-28 13:51 ` [PATCH V3 10/13] perf evlist: Disable 'immediate' events last Adrian Hunter
2020-02-28 13:51 ` [PATCH V3 11/13] perf tools: Add support for PERF_RECORD_TEXT_POKE Adrian Hunter
2020-02-28 13:51 ` [PATCH V3 12/13] perf tools: Add support for PERF_RECORD_KSYMBOL_TYPE_OOL Adrian Hunter
2020-02-28 13:51 ` [PATCH V3 13/13] perf intel-pt: Add support for text poke events Adrian Hunter
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