Messages in this thread | | | From | Jiri Olsa <> | Date | Fri, 1 Jul 2022 10:23:26 +0200 | Subject | Re: [PATCH v3] Add a "-m" option to "perf buildid-list". |
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On Wed, Jun 29, 2022 at 02:36:32PM -0700, Blake Jones wrote: > 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, 0xffffffffffffffff" 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>
Acked-by: Jiri Olsa <jolsa@kernel.org>
thanks, jirka
> --- > .../perf/Documentation/perf-buildid-list.txt | 4 ++ > tools/perf/builtin-buildid-list.c | 38 ++++++++++++++++++- > tools/perf/util/machine.c | 15 ++++++++ > tools/perf/util/machine.h | 5 +++ > 4 files changed, 61 insertions(+), 1 deletion(-) > > diff --git a/tools/perf/Documentation/perf-buildid-list.txt b/tools/perf/Documentation/perf-buildid-list.txt > index 25c52efcc7f0..e1e8fdbe06b9 100644 > --- a/tools/perf/Documentation/perf-buildid-list.txt > +++ b/tools/perf/Documentation/perf-buildid-list.txt > @@ -33,6 +33,10 @@ OPTIONS > -k:: > --kernel:: > Show running kernel build id. > +-m:: > +--kernel-maps:: > + Show buildid, start/end text address, and path of running kernel and > + its modules. > -v:: > --verbose:: > Be more verbose. > diff --git a/tools/perf/builtin-buildid-list.c b/tools/perf/builtin-buildid-list.c > index cebadd632234..cffca6a536e9 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 +21,34 @@ > #include <errno.h> > #include <linux/err.h> > > +static int buildid__map_cb(struct map *map, void *arg __maybe_unused) > +{ > + const struct dso *dso = map->dso; > + char bid_buf[SBUILD_ID_SIZE]; > + > + memset(bid_buf, 0, sizeof(bid_buf)); > + if (dso->has_build_id) > + build_id__sprintf(&dso->bid, bid_buf); > + printf("%s %16lx %16lx", bid_buf, map->start, map->end); > + if (dso->long_name != NULL) { > + printf(" %s", dso->long_name); > + } else if (dso->short_name != NULL) { > + printf(" %s", dso->short_name); > + } > + printf("\n"); > + > + return 0; > +} > + > +static void buildid__show_kernel_maps(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 +128,7 @@ 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_kernel_maps = false; > bool with_hits = false; > bool force = false; > const struct option options[] = { > @@ -106,6 +136,8 @@ 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', "kernel-maps", &show_kernel_maps, > + "Show build id of current kernel + modules"), > OPT_INCR('v', "verbose", &verbose, "be more verbose"), > OPT_END() > }; > @@ -117,8 +149,12 @@ 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_kernel_maps) { > + buildid__show_kernel_maps(); > + return 0; > + } > > return perf_session__list_build_ids(force, with_hits); > } > diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c > index 009061852808..16d225149b93 100644 > --- a/tools/perf/util/machine.c > +++ b/tools/perf/util/machine.c > @@ -3327,3 +3327,18 @@ 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)) { > + err = fn(map, priv); > + if (err != 0) { > + break; > + } > + } > + return err; > +} > diff --git a/tools/perf/util/machine.h b/tools/perf/util/machine.h > index 5d7daf7cb7bc..e1476343cbb2 100644 > --- a/tools/perf/util/machine.h > +++ b/tools/perf/util/machine.h > @@ -262,6 +262,11 @@ 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: 1bcca2b1bd67f3c0e5c3a88ed16c6389f01a5b31 > -- > 2.37.0.rc0.161.g10f37bed90-goog >
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