Messages in this thread Patch in this message | | | From | Adrian Hunter <> | Subject | [PATCH V2 08/13] ftrace: Add perf text poke events for ftrace trampolines | Date | Wed, 12 Feb 2020 14:49:44 +0200 |
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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
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