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| author |   Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> | 2016-04-12 14:40:50 +0530 |
|---|---|---|
| committer |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-05-05 21:04:03 -0300 |
| commit | 0b3c2264ae30ed692fd1ffd2b84c5fbdf737cb0d (patch) | |
| tree | f26cae86be020c92c2a78880da9af369427f3456 /tools/perf/util/probe-event.h | |
| parent | perf powerpc: Fix kprobe and kretprobe handling with kallsyms on ppc64le (diff) | |
| download | linux-dev-0b3c2264ae30ed692fd1ffd2b84c5fbdf737cb0d.tar.xz linux-dev-0b3c2264ae30ed692fd1ffd2b84c5fbdf737cb0d.zip | |
perf symbols: Fix kallsyms perf test on ppc64le
ppc64le functions have a Global Entry Point (GEP) and a Local Entry
Point (LEP). While placing a probe, we always prefer the LEP since it
catches function calls through both the GEP and the LEP. In order to do
this, we fixup the function entry points during elf symbol table lookup
to point to the LEPs. This works, but breaks 'perf test kallsyms' since
the symbols loaded from the symbol table (pointing to the LEP) do not
match the symbols in kallsyms.
To fix this, we do not adjust all the symbols during symbol table load.
Instead, we note down st_other in a newly introduced arch-specific
member of perf symbol structure, and later use this to adjust the probe
trace point.
Reported-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Acked-by: Balbir Singh <bsingharora@gmail.com>
Cc: Mark Wielaard <mjw@redhat.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/6be7c2b17e370100c2f79dd444509df7929bdd3e.1460451721.git.naveen.n.rao@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/probe-event.h')
| -rw-r--r-- | tools/perf/util/probe-event.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h index e2209623f981..5a27eb4fad05 100644 --- a/tools/perf/util/probe-event.h +++ b/tools/perf/util/probe-event.h @@ -154,7 +154,8 @@ int show_available_vars(struct perf_probe_event *pevs, int npevs, int show_available_funcs(const char *module, struct strfilter *filter, bool user); bool arch__prefers_symtab(void); void arch__fix_tev_from_maps(struct perf_probe_event *pev, - struct probe_trace_event *tev, struct map *map); + struct probe_trace_event *tev, struct map *map, + struct symbol *sym); /* If there is no space to write, returns -E2BIG. */ int e_snprintf(char *str, size_t size, const char *format, ...) |