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[Dle-develop] [tip:perf/urgent] perf probe: Check build-id of vmlinux
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From: tip-bot f. M. H. <mhi...@re...> - 2009-12-15 19:29:11
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Commit-ID: a128168d1e79e537d6666655e7771d973e9230e3 Gitweb: http://git.kernel.org/tip/a128168d1e79e537d6666655e7771d973e9230e3 Author: Masami Hiramatsu <mhi...@re...> AuthorDate: Tue, 15 Dec 2009 10:32:33 -0500 Committer: Ingo Molnar <mi...@el...> CommitDate: Tue, 15 Dec 2009 20:22:04 +0100 perf probe: Check build-id of vmlinux Check build-id of vmlinux by using functions in symbol.c. This also exposes map__load() for getting vmlinux path, and removes vmlinux path list in builtin-probe.c, because symbol.c already has that. Checking build-id prevents users to open old or different debuginfo from current running kernel. Signed-off-by: Masami Hiramatsu <mhi...@re...> Cc: Paul Mackerras <pa...@sa...> Cc: Arnaldo Carvalho de Melo <ac...@re...> Cc: Steven Rostedt <ro...@go...> Cc: Jim Keniston <jke...@us...> Cc: Ananth N Mavinakayanahalli <an...@in...> Cc: Christoph Hellwig <hc...@in...> Cc: Frank Ch. Eigler <fc...@re...> Cc: Jason Baron <jb...@re...> Cc: K.Prasad <pr...@li...> Cc: Peter Zijlstra <pe...@in...> Cc: Srikar Dronamraju <sr...@li...> Cc: systemtap <sys...@so...> Cc: DLE <dle...@li...> Cc: Frederic Weisbecker <fwe...@gm...> LKML-Reference: <200...@dh...> Signed-off-by: Ingo Molnar <mi...@el...> --- tools/perf/builtin-probe.c | 72 ++++++++++++++++++------------------------- tools/perf/util/event.h | 2 + tools/perf/util/map.c | 14 +++++--- 3 files changed, 41 insertions(+), 47 deletions(-) diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c index 8b4fdae..0584b7a 100644 --- a/tools/perf/builtin-probe.c +++ b/tools/perf/builtin-probe.c @@ -38,33 +38,27 @@ #include "util/strlist.h" #include "util/event.h" #include "util/debug.h" +#include "util/symbol.h" +#include "util/thread.h" +#include "util/session.h" #include "util/parse-options.h" #include "util/parse-events.h" /* For debugfs_path */ #include "util/probe-finder.h" #include "util/probe-event.h" -/* Default vmlinux search paths */ -#define NR_SEARCH_PATH 4 -const char *default_search_path[NR_SEARCH_PATH] = { -"/lib/modules/%s/build/vmlinux", /* Custom build kernel */ -"/usr/lib/debug/lib/modules/%s/vmlinux", /* Red Hat debuginfo */ -"/boot/vmlinux-debug-%s", /* Ubuntu */ -"./vmlinux", /* CWD */ -}; - #define MAX_PATH_LEN 256 #define MAX_PROBES 128 /* Session management structure */ static struct { - char *vmlinux; - char *release; bool need_dwarf; bool list_events; bool force_add; int nr_probe; struct probe_point probes[MAX_PROBES]; struct strlist *dellist; + struct symbol_conf conf; + struct perf_session *psession; } session; @@ -122,33 +116,21 @@ static int opt_del_probe_event(const struct option *opt __used, } #ifndef NO_LIBDWARF -static int open_default_vmlinux(void) +static int open_vmlinux(void) { - struct utsname uts; - char fname[MAX_PATH_LEN]; - int fd, ret, i; - - ret = uname(&uts); - if (ret) { - pr_debug("uname() failed.\n"); - return -errno; + struct map *kmap; + kmap = map_groups__find_by_name(&session.psession->kmaps, + MAP__FUNCTION, "[kernel.kallsyms]"); + if (!kmap) { + pr_debug("Could not find kernel map.\n"); + return -ENOENT; } - session.release = uts.release; - for (i = 0; i < NR_SEARCH_PATH; i++) { - ret = snprintf(fname, MAX_PATH_LEN, - default_search_path[i], session.release); - if (ret >= MAX_PATH_LEN || ret < 0) { - pr_debug("Filename(%d,%s) is too long.\n", i, - uts.release); - errno = E2BIG; - return -E2BIG; - } - pr_debug("try to open %s\n", fname); - fd = open(fname, O_RDONLY); - if (fd >= 0) - break; + if (map__load(kmap, session.psession, NULL) < 0) { + pr_debug("Failed to load kernel map.\n"); + return -EINVAL; } - return fd; + pr_debug("Try to open %s\n", kmap->dso->long_name); + return open(kmap->dso->long_name, O_RDONLY); } #endif @@ -164,8 +146,8 @@ static const struct option options[] = { OPT_BOOLEAN('v', "verbose", &verbose, "be more verbose (show parsed arguments, etc)"), #ifndef NO_LIBDWARF - OPT_STRING('k', "vmlinux", &session.vmlinux, "file", - "vmlinux/module pathname"), + OPT_STRING('k', "vmlinux", &session.conf.vmlinux_name, + "file", "vmlinux pathname"), #endif OPT_BOOLEAN('l', "list", &session.list_events, "list up current probe events"), @@ -236,17 +218,23 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used) return 0; } + /* Initialize symbol maps for vmlinux */ + if (session.conf.vmlinux_name == NULL) + session.conf.try_vmlinux_path = true; + if (symbol__init(&session.conf) < 0) + die("Failed to init symbol map."); + session.psession = perf_session__new(NULL, O_WRONLY, false, + &session.conf); + if (session.psession == NULL) + die("Failed to init perf_session."); + if (session.need_dwarf) #ifdef NO_LIBDWARF die("Debuginfo-analysis is not supported"); #else /* !NO_LIBDWARF */ pr_debug("Some probes require debuginfo.\n"); - if (session.vmlinux) { - pr_debug("Try to open %s.", session.vmlinux); - fd = open(session.vmlinux, O_RDONLY); - } else - fd = open_default_vmlinux(); + fd = open_vmlinux(); if (fd < 0) { if (session.need_dwarf) die("Could not open debuginfo file."); diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h index a92e0b0..8027309 100644 --- a/tools/perf/util/event.h +++ b/tools/perf/util/event.h @@ -152,6 +152,8 @@ size_t map__fprintf(struct map *self, FILE *fp); struct perf_session; +int map__load(struct map *self, struct perf_session *session, + symbol_filter_t filter); struct symbol *map__find_symbol(struct map *self, struct perf_session *session, u64 addr, symbol_filter_t filter); struct symbol *map__find_symbol_by_name(struct map *self, const char *name, diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c index 8b3dd46..c4d55a0 100644 --- a/tools/perf/util/map.c +++ b/tools/perf/util/map.c @@ -104,12 +104,16 @@ void map__fixup_end(struct map *self) #define DSO__DELETED "(deleted)" -static int map__load(struct map *self, struct perf_session *session, - symbol_filter_t filter) +int map__load(struct map *self, struct perf_session *session, + symbol_filter_t filter) { const char *name = self->dso->long_name; - int nr = dso__load(self->dso, self, session, filter); + int nr; + if (dso__loaded(self->dso, self->type)) + return 0; + + nr = dso__load(self->dso, self, session, filter); if (nr < 0) { if (self->dso->has_build_id) { char sbuild_id[BUILD_ID_SIZE * 2 + 1]; @@ -147,7 +151,7 @@ static int map__load(struct map *self, struct perf_session *session, struct symbol *map__find_symbol(struct map *self, struct perf_session *session, u64 addr, symbol_filter_t filter) { - if (!dso__loaded(self->dso, self->type) && map__load(self, session, filter) < 0) + if (map__load(self, session, filter) < 0) return NULL; return dso__find_symbol(self->dso, self->type, addr); @@ -157,7 +161,7 @@ struct symbol *map__find_symbol_by_name(struct map *self, const char *name, struct perf_session *session, symbol_filter_t filter) { - if (!dso__loaded(self->dso, self->type) && map__load(self, session, filter) < 0) + if (map__load(self, session, filter) < 0) return NULL; if (!dso__sorted_by_name(self->dso, self->type)) |
