Here is a cuple of patches to update perf probe for supporting meta arguments for local variables.
With this updates we can use $vars as a probe event argument for all available local variables at that address. And also, I've found an issue about variable location. With -fentry, since the variable available address range has skipped the mcount call instruction at the function entry, `perf probe --vars a_function_with_mcount` always failed to find available variables. This also disabled $vars at the function entry which is for tracing function parameters. The second patch tries to fix this issue by searching variables from the entry address of the function. Note that this works only for function parameters (not for auto varibales, because those are not initialized yet at the function entry). Thank you, --- Masami Hiramatsu (2): perf probe: Support "$vars" meta argument syntax for local variables perf probe: Find fentry mcount fuzzed parameter location tools/perf/util/probe-event.c | 1 tools/perf/util/probe-finder.c | 133 +++++++++++++++++++++++++++++++++++----- tools/perf/util/probe-finder.h | 1 3 files changed, 119 insertions(+), 16 deletions(-) -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/