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authorNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>2016-04-12 14:40:50 +0530
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-05-05 21:04:03 -0300
commit0b3c2264ae30ed692fd1ffd2b84c5fbdf737cb0d (patch)
treef26cae86be020c92c2a78880da9af369427f3456 /tools/perf/util/probe-event.h
parent239aeba764092b29dd7cab177cd47f472390622e (diff)
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.h3
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, ...)