Messages in this thread | | | Date | Tue, 10 May 2022 13:46:35 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [PATCH] Add an "-m" option to "perf buildid-list". |
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Em Tue, May 03, 2022 at 02:37:04PM -0700, Blake Jones escreveu: > This new option displays all of the information needed to do external > BuildID-based symbolization of kernel stack traces, such as those collected > by bpf_get_stackid(). For each kernel module plus the main kernel, it > displays the BuildID, the start and end virtual addresses of that module's > text range (rounded out to page boundaries), and the pathname of the > module. > > When run as a non-privileged user, the actual addresses of the modules' > text ranges are not available, so the tools displays "0, <text length>" for > kernel modules and "0, ffffffffffffffff" for the kernel itself. > > Sample output: > > root# perf buildid-list -m > cf6df852fd4da122d616153353cc8f560fd12fe0 ffffffffa5400000 ffffffffa6001e27 [kernel.kallsyms] > 1aa7209aa2acb067d66ed6cf7676d65066384d61 ffffffffc0087000 ffffffffc008b000 /lib/modules/5.15.15-1rodete2-amd64/kernel/crypto/sha512_generic.ko > 3857815b5bf0183697b68f8fe0ea06121644041e ffffffffc008c000 ffffffffc0098000 /lib/modules/5.15.15-1rodete2-amd64/kernel/arch/x86/crypto/sha512-ssse3.ko > 4081fde0bca2bc097cb3e9d1efcb836047d485f1 ffffffffc0099000 ffffffffc009f000 /lib/modules/5.15.15-1rodete2-amd64/kernel/drivers/acpi/button.ko > 1ef81ba4890552ea6b0314f9635fc43fc8cef568 ffffffffc00a4000 ffffffffc00aa000 /lib/modules/5.15.15-1rodete2-amd64/kernel/crypto/cryptd.ko > cc5c985506cb240d7d082b55ed260cbb851f983e ffffffffc00af000 ffffffffc00b6000 /lib/modules/5.15.15-1rodete2-amd64/kernel/drivers/i2c/busses/i2c-piix4.ko > [...] > > Signed-off-by: Blake Jones <blakejones@google.com> > --- > .../perf/Documentation/perf-buildid-list.txt | 3 ++ > tools/perf/builtin-buildid-list.c | 33 ++++++++++++++++++- > tools/perf/util/dso.c | 23 +++++++++++++ > tools/perf/util/dso.h | 2 ++ > tools/perf/util/machine.c | 13 ++++++++ > tools/perf/util/machine.h | 5 +++ > 6 files changed, 78 insertions(+), 1 deletion(-) > > diff --git a/tools/perf/Documentation/perf-buildid-list.txt b/tools/perf/Documentation/perf-buildid-list.txt > index 25c52efcc7f0..a82e92c2667d 100644 > --- a/tools/perf/Documentation/perf-buildid-list.txt > +++ b/tools/perf/Documentation/perf-buildid-list.txt > @@ -33,6 +33,9 @@ OPTIONS > -k:: > --kernel:: > Show running kernel build id. > +-m:: > +--modules:: > + Show buildid, start/end text address, and path of kernel and modules.
Hi,
Wouldn't it be better to have -m show just modules, name + buildid, then have -v show more verbose info, i.e. the start, end and switch from just the module name to its full path?
Then to get what your patch produces now one would use:
$ perf buildid-list -kmv
That would be more flexible, wdyt?
- Arnaldo
> -v:: > --verbose:: > Be more verbose. > diff --git a/tools/perf/builtin-buildid-list.c b/tools/perf/builtin-buildid-list.c > index cebadd632234..9a5587de8fd0 100644 > --- a/tools/perf/builtin-buildid-list.c > +++ b/tools/perf/builtin-buildid-list.c > @@ -12,6 +12,7 @@ > #include "util/build-id.h" > #include "util/debug.h" > #include "util/dso.h" > +#include "util/map.h" > #include <subcmd/pager.h> > #include <subcmd/parse-options.h> > #include "util/session.h" > @@ -20,6 +21,29 @@ > #include <errno.h> > #include <linux/err.h> > > +static int buildid__map_cb(struct map *map, void *arg __maybe_unused) > +{ > + struct build_id build_id; > + char bid_buf[SBUILD_ID_SIZE]; > + char modpath[255]; > + > + dso__get_build_id(map->dso, &build_id); > + build_id__sprintf(&build_id, bid_buf); > + dso__get_long_name(map->dso, modpath, sizeof(modpath)); > + printf("%s %16lx %16lx %s\n", bid_buf, map->start, map->end, modpath); > + > + return 0; > +} > + > +static void buildid__show_kernel_modules(void) > +{ > + struct machine *machine; > + > + machine = machine__new_host(); > + machine__for_each_kernel_map(machine, buildid__map_cb, NULL); > + machine__delete(machine); > +} > + > static int sysfs__fprintf_build_id(FILE *fp) > { > char sbuild_id[SBUILD_ID_SIZE]; > @@ -99,6 +123,7 @@ static int perf_session__list_build_ids(bool force, bool with_hits) > int cmd_buildid_list(int argc, const char **argv) > { > bool show_kernel = false; > + bool show_modules = false; > bool with_hits = false; > bool force = false; > const struct option options[] = { > @@ -106,6 +131,8 @@ int cmd_buildid_list(int argc, const char **argv) > OPT_STRING('i', "input", &input_name, "file", "input file name"), > OPT_BOOLEAN('f', "force", &force, "don't complain, do it"), > OPT_BOOLEAN('k', "kernel", &show_kernel, "Show current kernel build id"), > + OPT_BOOLEAN('m', "modules", &show_modules, > + "Show build id of current kernel + modules"), > OPT_INCR('v', "verbose", &verbose, "be more verbose"), > OPT_END() > }; > @@ -117,8 +144,12 @@ int cmd_buildid_list(int argc, const char **argv) > argc = parse_options(argc, argv, options, buildid_list_usage, 0); > setup_pager(); > > - if (show_kernel) > + if (show_kernel) { > return !(sysfs__fprintf_build_id(stdout) > 0); > + } else if (show_modules) { > + buildid__show_kernel_modules(); > + return 0; > + } > > return perf_session__list_build_ids(force, with_hits); > } > diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c > index 5ac13958d1bd..7c490b5ce449 100644 > --- a/tools/perf/util/dso.c > +++ b/tools/perf/util/dso.c > @@ -1227,6 +1227,19 @@ void dso__set_long_name(struct dso *dso, const char *name, bool name_allocated) > dso__set_long_name_id(dso, name, NULL, name_allocated); > } > > +void dso__get_long_name(const struct dso *dso, char *name, size_t len) > +{ > + if (len == 0) > + return; > + if (dso->long_name == NULL) { > + name[0] = '\0'; > + return; > + } > + > + strncpy(name, dso->long_name, len); > + name[len - 1] = '\0'; > +} > + > void dso__set_short_name(struct dso *dso, const char *name, bool name_allocated) > { > if (name == NULL) > @@ -1359,6 +1372,16 @@ void dso__set_build_id(struct dso *dso, struct build_id *bid) > dso->has_build_id = 1; > } > > +void dso__get_build_id(struct dso *dso, struct build_id *bid) > +{ > + if (dso->has_build_id) { > + *bid = dso->bid; > + } else { > + bid->size = 0; > + memset(bid->data, 0, sizeof(*bid->data)); > + } > +} > + > bool dso__build_id_equal(const struct dso *dso, struct build_id *bid) > { > if (dso->bid.size > bid->size && dso->bid.size == BUILD_ID_SIZE) { > diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h > index 3a9fd4d389b5..896ed335b562 100644 > --- a/tools/perf/util/dso.h > +++ b/tools/perf/util/dso.h > @@ -237,6 +237,7 @@ void dso__delete(struct dso *dso); > int dso__cmp_id(struct dso *a, struct dso *b); > void dso__set_short_name(struct dso *dso, const char *name, bool name_allocated); > void dso__set_long_name(struct dso *dso, const char *name, bool name_allocated); > +void dso__get_long_name(const struct dso *dso, char *name, size_t len); > > int dso__name_len(const struct dso *dso); > > @@ -263,6 +264,7 @@ void dso__set_sorted_by_name(struct dso *dso); > void dso__sort_by_name(struct dso *dso); > > void dso__set_build_id(struct dso *dso, struct build_id *bid); > +void dso__get_build_id(struct dso *dso, struct build_id *bid); > bool dso__build_id_equal(const struct dso *dso, struct build_id *bid); > void dso__read_running_kernel_build_id(struct dso *dso, > struct machine *machine); > diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c > index 95391236f5f6..78e84eb037a6 100644 > --- a/tools/perf/util/machine.c > +++ b/tools/perf/util/machine.c > @@ -3232,3 +3232,16 @@ int machine__for_each_dso(struct machine *machine, machine__dso_t fn, void *priv > } > return err; > } > + > +int machine__for_each_kernel_map(struct machine *machine, machine__map_t fn, void *priv) > +{ > + struct maps *maps = machine__kernel_maps(machine); > + struct map *map; > + int err = 0; > + > + for (map = maps__first(maps); map != NULL; map = map__next(map)) { > + if (fn(map, priv)) > + err = -1; > + } > + return err; > +} > diff --git a/tools/perf/util/machine.h b/tools/perf/util/machine.h > index 0023165422aa..2a022259d373 100644 > --- a/tools/perf/util/machine.h > +++ b/tools/perf/util/machine.h > @@ -259,6 +259,11 @@ typedef int (*machine__dso_t)(struct dso *dso, struct machine *machine, void *pr > > int machine__for_each_dso(struct machine *machine, machine__dso_t fn, > void *priv); > + > +typedef int (*machine__map_t)(struct map *map, void *priv); > +int machine__for_each_kernel_map(struct machine *machine, machine__map_t fn, > + void *priv); > + > int machine__for_each_thread(struct machine *machine, > int (*fn)(struct thread *thread, void *p), > void *priv); > > base-commit: e0c1b8f9eba88173b30ba42eb492fd20582cf376 > -- > 2.36.0.464.gb9c8b46e94-goog
--
- Arnaldo
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