Messages in this thread | | | Date | Wed, 20 Oct 2021 15:24:19 +0200 | From | Jiri Olsa <> | Subject | Re: [PATCH] perf script: Show binary offsets for userspace addr |
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On Tue, Oct 19, 2021 at 03:24:17PM +0800, Lexi Shao wrote: > Show binary offsets for userspace addr with map in perf script output > with callchain. > > In commit 19610184693c("perf script: Show virtual addresses instead of > offsets"), the addr shown in perf script output with callchain is changed > from binary offsets to virtual address to fix the incorrectness when > displaying symbol offset. > > This is inconvenient in scenario that the binary is stripped and > symbol cannot be resolved. If someone wants to further resolve symbols for > specific binaries later, he would need an extra step to translate virtual > address to binary offset with mapping information recorded in perf.data, > which can be difficult for people not familiar with perf. > > This patch modifies function sample__fprintf_callchain to print binary > offset for userspace addr with dsos, and virtual address otherwise. It > does not affect symbol offset calculation so symoff remains correct. > > Before applying this patch: > test 1512 78.711307: 533129 cycles: > aaaae0da07f4 [unknown] (/tmp/test) > aaaae0da0704 [unknown] (/tmp/test) > ffffbe9f7ef4 __libc_start_main+0xe4 (/lib64/libc-2.31.so) > > After this patch: > test 1519 111.330127: 406953 cycles: > 7f4 [unknown] (/tmp/test) > 704 [unknown] (/tmp/test) > 20ef4 __libc_start_main+0xe4 (/lib64/libc-2.31.so) > > Fixes: 19610184693c("perf script: Show virtual addresses instead of offsets") > > Signed-off-by: Lexi Shao <shaolexi@huawei.com>
makes sense to me
Acked-/Tested-by Jiri Olsa <jolsa@redhat.com>
should we have a way to display these callchain detail in perf report output as well?
thanks, jirka
> --- > tools/perf/util/evsel_fprintf.c | 12 +++++++++--- > 1 file changed, 9 insertions(+), 3 deletions(-) > > diff --git a/tools/perf/util/evsel_fprintf.c b/tools/perf/util/evsel_fprintf.c > index bfedd7b23521..8c2ea8001329 100644 > --- a/tools/perf/util/evsel_fprintf.c > +++ b/tools/perf/util/evsel_fprintf.c > @@ -11,6 +11,7 @@ > #include "strlist.h" > #include "symbol.h" > #include "srcline.h" > +#include "dso.h" > > static int comma_fprintf(FILE *fp, bool *first, const char *fmt, ...) > { > @@ -144,12 +145,17 @@ int sample__fprintf_callchain(struct perf_sample *sample, int left_alignment, > if (print_arrow && !first) > printed += fprintf(fp, " <-"); > > - if (print_ip) > - printed += fprintf(fp, "%c%16" PRIx64, s, node->ip); > - > if (map) > addr = map->map_ip(map, node->ip); > > + if (print_ip) { > + /* Show binary offset for userspace addr */ > + if (map && !map->dso->kernel) > + printed += fprintf(fp, "%c%16" PRIx64, s, addr); > + else > + printed += fprintf(fp, "%c%16" PRIx64, s, node->ip); > + } > + > if (print_sym) { > printed += fprintf(fp, " "); > node_al.addr = addr; > -- > 2.12.3 >
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