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Date: Tue, 5 Nov 2019 09:16:38 +0900 From: Masami Hiramatsu <mhiramat@...nel.org> To: Arnaldo Carvalho de Melo <acme@...nel.org> Cc: Masami Hiramatsu <mhiramat@...nel.org>, Ingo Molnar <mingo@...hat.com>, Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org, Tom Zanussi <tom.zanussi@...ux.intel.com>, Ravi Bangoria <ravi.bangoria@...ux.ibm.com>, Namhyung Kim <namhyung@...nel.org> Subject: [PATCH 0/5] perf/probe: Support multiprobe and immediates This series adds multiprobe support on perf probe command. This can be applied on top of my previous (sent last week) bugfix series, https://lkml.kernel.org/r/157241935028.32002.10228194508152968737.stgit@devnote2 Inlined functions or the lines which have multiple statements can be compiled in multiple addresses. Current perf probe generates different events for each address, but this is not useful for users. Since ftrace multiprobe per event support is on ftrace/for-next, it is a time to push this series. To support multi-probe, this adds below 4 patches + 1 minor fix. - Fix a rare case bug for missing scope-DIE in some inlined functions. - Modify the naming scheme of probe event to Line number based instead of function name based. - Add multi-probe support on perf probe. This also converts different register assignment on local variables for each probe point. - Add const value attribute support. It is possible that the compiler assigns a constant value for optimized function parameter or local variables. This handles such case. - Introduce a magic number assignment to non-exist local variable. Inlined functions can be embedded (inlined) in caller function and the parameter or local vars in such inlined function can be optimized out some place, but in some place we still can see those vars. For supporting multiprobe correctly, we need to fill out some value even if we can not find the given local vars. So this fills it with "0xdeade12d(dead end)" magic number. Thank you, --- Masami Hiramatsu (5): perf probe: Return a better scope DIE if there is no best scope perf probe: Generate event name with line number perf probe: Support multiprobe event perf probe: Support DW_AT_const_value constant value perf probe: Trace a magic number if variable is not found tools/perf/util/probe-event.c | 19 +++++++- tools/perf/util/probe-event.h | 3 + tools/perf/util/probe-file.c | 14 ++++++ tools/perf/util/probe-file.h | 2 + tools/perf/util/probe-finder.c | 90 ++++++++++++++++++++++++++++++++++++++-- tools/perf/util/probe-finder.h | 1 6 files changed, 121 insertions(+), 8 deletions(-) -- Masami Hiramatsu (Linaro) <mhiramat@...nel.org>
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