Messages in this thread | | | Subject | [PATCH perf/core 0/4] perf-probe: improve glibc support | From | Masami Hiramatsu <> | Date | Mon, 02 Mar 2015 21:49:39 +0900 |
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Hi,
Here is a series of patches which improves perf-probe to handle glibc's aliased symbols more correctly. Longly, a major known issue of probing on glibc is that the some aliased symbols(e.g. malloc) can not find by perf-probe.
Actually, glibc's malloc symbol is just an alias of __libc_malloc. Its debuginfo knows only __libc_malloc, and perf's symbol map knows only malloc. This difference always confuses users that they can see malloc by perf report or annotate, but they can not probe on it, nor find definitions by --line option.
Previously, I've made a commit 906451b98b67 which solved this problem partly, but not completely fixed. So I decided to solve this issue completely by finding the symbols like malloc from perf's symbol map, and converting the symbol's address into debuginfo's location infomation.
With this series, you can use --vars, --line and --add with the aliased symbols on glibc.
Note that the 1/4 patch is just a resend patch which I sent last weekend (since this series depends on that) http://www.gossamer-threads.com/lists/linux/kernel/2115623
2/4 and 3/4 introduces above logic to solve this issue. And 4/4 reverts previous incomplete fix.
Thank you,
---
Masami Hiramatsu (4): [RESEND][BUGFIX] perf-probe: Remove bias offset to find probe point by address perf-probe: Fix to handle aliased symbols in glibc perf-probe: Fix --line to handle aliased symbols in glibc Revert "perf probe: Fix to fall back to find probe point in symbols"
tools/perf/util/probe-event.c | 181 +++++++++++++++++++++++++++++++++++----- tools/perf/util/probe-finder.c | 5 - 2 files changed, 160 insertions(+), 26 deletions(-)
-- Masami HIRAMATSU Software Platform Research Dpt. Linux Technology Center Hitachi, Ltd., Yokohama Research Laboratory E-mail: masami.hiramatsu.pt@hitachi.com
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