Messages in this thread Patch in this message | | | From | Adrian Hunter <> | Subject | [PATCH V4 08/13] ftrace: Add perf text poke events for ftrace trampolines | Date | Wed, 4 Mar 2020 11:06:28 +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> --- kernel/trace/ftrace.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+)
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index fda0c9144642..75f9aac31fec 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -2795,6 +2795,13 @@ static void ftrace_trampoline_free(struct ftrace_ops *ops) { if (ops && (ops->flags & FTRACE_OPS_FL_ALLOC_TRAMP) && ops->trampoline) { + /* + * 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, ops->trampoline, ops->trampoline_size, true, FTRACE_TRAMPOLINE_SYM); @@ -6812,6 +6819,13 @@ static void ftrace_update_trampoline(struct ftrace_ops *ops) perf_event_ksymbol(PERF_RECORD_KSYMBOL_TYPE_OOL, ops->trampoline, ops->trampoline_size, false, FTRACE_TRAMPOLINE_SYM); + /* + * Record the perf text poke event after the ksymbol register + * event. + */ + perf_event_text_poke((void *)ops->trampoline, NULL, 0, + (void *)ops->trampoline, + ops->trampoline_size); } } -- 2.17.1
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