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Date: Wed, 8 Dec 2010 18:56:14 -0200
From: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To: David Ahern <daahern@...co.com>
Cc: linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf tools: Add symfs option for off-box analysis using
specified tree
Em Tue, Dec 07, 2010 at 07:42:54PM -0700, David Ahern escreveu:
> The symfs argument allows analysis of perf.data file using a locally
> accessible filesystem tree with debug symbols - e.g., tree created
> during image builds, sshfs mount, loop mounted KVM disk images,
> USB keys, initrds, etc. Anything with an OS tree can be analyzed from
> anywhere without the need to populate a local data store with
> build-ids.
>
> Signed-off-by: David Ahern <daahern@...co.com>
> ---
> tools/perf/builtin-annotate.c | 16 +++++--
> tools/perf/builtin-diff.c | 2 +
> tools/perf/builtin-report.c | 2 +
> tools/perf/builtin-timechart.c | 2 +
> tools/perf/util/hist.c | 14 +++++-
> tools/perf/util/symbol.c | 82 +++++++++++++++++++++++++---------------
> tools/perf/util/symbol.h | 1 +
> 7 files changed, 80 insertions(+), 39 deletions(-)
>
> diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
> index 569a276..0c47bee 100644
> --- a/tools/perf/builtin-annotate.c
> +++ b/tools/perf/builtin-annotate.c
> @@ -280,7 +280,8 @@ static int hist_entry__tty_annotate(struct hist_entry *he)
> struct map *map = he->ms.map;
> struct dso *dso = map->dso;
> struct symbol *sym = he->ms.sym;
> - const char *filename = dso->long_name, *d_filename;
> + const char *filename = dso->long_name;
> + char d_filename[PATH_MAX];
> u64 len;
> LIST_HEAD(head);
> struct objdump_line *pos, *n;
> @@ -288,10 +289,13 @@ static int hist_entry__tty_annotate(struct hist_entry *he)
> if (hist_entry__annotate(he, &head, 0) < 0)
> return -1;
>
> - if (full_paths)
> - d_filename = filename;
> - else
> - d_filename = basename(filename);
> + if (full_paths) {
> + snprintf(d_filename, sizeof(d_filename), "%s%s",
> + symbol_conf.symfs, filename);
> + } else {
> + snprintf(d_filename, sizeof(d_filename), "%s/%s",
> + symbol_conf.symfs, basename(filename));
> + }
Are you sure about the one above? I guess you don't need to concat here,
its just informative message, if you're using --symfs, you know
everything is from there, and in the !full_paths case the resulting
filename will be bogus, right?
> len = sym->end - sym->start;
>
> @@ -437,6 +441,8 @@ static const struct option options[] = {
> "print matching source lines (may be slow)"),
> OPT_BOOLEAN('P', "full-paths", &full_paths,
> "Don't shorten the displayed pathnames"),
> + OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
> + "Look for files with symbols relative to this directory"),
> OPT_END()
> };
>
> diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
> index 5e1a043..71126a6 100644
> --- a/tools/perf/builtin-diff.c
> +++ b/tools/perf/builtin-diff.c
> @@ -192,6 +192,8 @@ static const struct option options[] = {
> OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
> "separator for columns, no spaces will be added between "
> "columns '.' is reserved."),
> + OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
> + "Look for files with symbols relative to this directory"),
> OPT_END()
> };
>
> diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
> index 904519f..57b0f49 100644
> --- a/tools/perf/builtin-report.c
> +++ b/tools/perf/builtin-report.c
> @@ -479,6 +479,8 @@ static const struct option options[] = {
> "columns '.' is reserved."),
> OPT_BOOLEAN('U', "hide-unresolved", &hide_unresolved,
> "Only display entries resolved to a symbol"),
> + OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
> + "Look for files with symbols relative to this directory"),
> OPT_END()
> };
>
> diff --git a/tools/perf/builtin-timechart.c b/tools/perf/builtin-timechart.c
> index d2fc461..965aa4e 100644
> --- a/tools/perf/builtin-timechart.c
> +++ b/tools/perf/builtin-timechart.c
> @@ -1021,6 +1021,8 @@ static const struct option options[] = {
> OPT_CALLBACK('p', "process", NULL, "process",
> "process selector. Pass a pid or process name.",
> parse_process),
> + OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
> + "Look for files with symbols relative to this directory"),
> OPT_END()
> };
>
> diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
> index 2022e87..b24ae53 100644
> --- a/tools/perf/util/hist.c
> +++ b/tools/perf/util/hist.c
> @@ -1092,6 +1092,12 @@ int hist_entry__annotate(struct hist_entry *self, struct list_head *head,
> FILE *file;
> int err = 0;
> u64 len;
> + char symfs_filename[PATH_MAX];
> +
> + if (filename) {
> + snprintf(symfs_filename, sizeof(symfs_filename), "%s%s",
> + symbol_conf.symfs, filename);
Above you have tab/space damage
> + }
>
> if (filename == NULL) {
> if (dso->has_build_id) {
> @@ -1100,9 +1106,9 @@ int hist_entry__annotate(struct hist_entry *self, struct list_head *head,
> return -ENOMEM;
> }
> goto fallback;
> - } else if (readlink(filename, command, sizeof(command)) < 0 ||
> + } else if (readlink(symfs_filename, command, sizeof(command)) < 0 ||
> strstr(command, "[kernel.kallsyms]") ||
> - access(filename, R_OK)) {
> + access(symfs_filename, R_OK)) {
> free(filename);
> fallback:
> /*
> @@ -1111,6 +1117,8 @@ fallback:
> * DSO is the same as when 'perf record' ran.
> */
> filename = dso->long_name;
> + snprintf(symfs_filename, sizeof(symfs_filename), "%s%s",
> + symbol_conf.symfs, filename);
Ditto above
> free_filename = false;
> }
>
> @@ -1137,7 +1145,7 @@ fallback:
> "objdump --start-address=0x%016Lx --stop-address=0x%016Lx -dS -C %s|grep -v %s|expand",
> map__rip_2objdump(map, sym->start),
> map__rip_2objdump(map, sym->end),
> - filename, filename);
> + symfs_filename, filename);
>
> pr_debug("Executing: %s\n", command);
>
> diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
> index a348906..7a0d284 100644
> --- a/tools/perf/util/symbol.c
> +++ b/tools/perf/util/symbol.c
> @@ -41,6 +41,7 @@ struct symbol_conf symbol_conf = {
> .exclude_other = true,
> .use_modules = true,
> .try_vmlinux_path = true,
> + .symfs = "",
> };
>
> int dso__name_len(const struct dso *self)
> @@ -833,8 +834,11 @@ static int dso__synthesize_plt_symbols(struct dso *self, struct map *map,
> char sympltname[1024];
> Elf *elf;
> int nr = 0, symidx, fd, err = 0;
> + char name[PATH_MAX];
>
> - fd = open(self->long_name, O_RDONLY);
> + snprintf(name, sizeof(name), "%s%s",
> + symbol_conf.symfs, self->long_name);
> + fd = open(name, O_RDONLY);
> if (fd < 0)
> goto out;
>
> @@ -1446,16 +1450,19 @@ int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
> self->origin++) {
> switch (self->origin) {
> case DSO__ORIG_BUILD_ID_CACHE:
> - if (dso__build_id_filename(self, name, size) == NULL)
> + /* skip the locally configured cache if a symfs is given */
> + if ((strlen(symbol_conf.symfs) != 0) ||
I suggest you use:
if (symbol_conf.symfs[1] ||
cheaper :)
> + (dso__build_id_filename(self, name, size) == NULL)) {
> continue;
> + }
> break;
> case DSO__ORIG_FEDORA:
> - snprintf(name, size, "/usr/lib/debug%s.debug",
> - self->long_name);
> + snprintf(name, size, "%s/usr/lib/debug%s.debug",
> + symbol_conf.symfs, self->long_name);
> break;
> case DSO__ORIG_UBUNTU:
> - snprintf(name, size, "/usr/lib/debug%s",
> - self->long_name);
> + snprintf(name, size, "%s/usr/lib/debug%s",
> + symbol_conf.symfs, self->long_name);
> break;
> case DSO__ORIG_BUILDID: {
> char build_id_hex[BUILD_ID_SIZE * 2 + 1];
> @@ -1467,12 +1474,13 @@ int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
> sizeof(self->build_id),
> build_id_hex);
> snprintf(name, size,
> - "/usr/lib/debug/.build-id/%.2s/%s.debug",
> - build_id_hex, build_id_hex + 2);
> + "%s/usr/lib/debug/.build-id/%.2s/%s.debug",
> + symbol_conf.symfs, build_id_hex, build_id_hex + 2);
> }
> break;
> case DSO__ORIG_DSO:
> - snprintf(name, size, "%s", self->long_name);
> + snprintf(name, size, "%s%s",
> + symbol_conf.symfs, self->long_name);
> break;
> case DSO__ORIG_GUEST_KMODULE:
> if (map->groups && map->groups->machine)
> @@ -1778,17 +1786,20 @@ static int dso__load_vmlinux(struct dso *self, struct map *map,
> const char *vmlinux, symbol_filter_t filter)
> {
> int err = -1, fd;
> + char symfs_vmlinux[PATH_MAX];
> - fd = open(vmlinux, O_RDONLY);
> + snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s/%s",
> + symbol_conf.symfs, vmlinux);
Its userspace, so stack is plenty, but I guess if using asprintf
wouldn't be better...
I.e. if we were programming some kernel module, creating a 4K stack
variable would be considered bad practice, so I think it is here as
well.
> + fd = open(symfs_vmlinux, O_RDONLY);
> if (fd < 0)
> return -1;
>
> dso__set_loaded(self, map->type);
> - err = dso__load_sym(self, map, vmlinux, fd, filter, 0, 0);
> + err = dso__load_sym(self, map, symfs_vmlinux, fd, filter, 0, 0);
> close(fd);
>
> if (err > 0)
> - pr_debug("Using %s for symbols\n", vmlinux);
> + pr_debug("Using %s for symbols\n", symfs_vmlinux);
>
> return err;
> }
> @@ -1861,6 +1872,10 @@ static int dso__load_kernel_sym(struct dso *self, struct map *map,
> goto out_fixup;
> }
>
> + /* do not try local files if a symfs was given */
> + if (strlen(symbol_conf.symfs) != 0)
> + return -1;
> +
> /*
> * Say the kernel DSO was created when processing the build-id header table,
> * we have a build-id, so check if it is the same as the running kernel,
> @@ -2210,9 +2225,6 @@ static int vmlinux_path__init(void)
> struct utsname uts;
> char bf[PATH_MAX];
>
> - if (uname(&uts) < 0)
> - return -1;
> -
> vmlinux_path = malloc(sizeof(char *) * 5);
> if (vmlinux_path == NULL)
> return -1;
> @@ -2225,22 +2237,30 @@ static int vmlinux_path__init(void)
> if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
> goto out_fail;
> ++vmlinux_path__nr_entries;
> - snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
> - vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
> - if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
> - goto out_fail;
> - ++vmlinux_path__nr_entries;
> - snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release);
> - vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
> - if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
> - goto out_fail;
> - ++vmlinux_path__nr_entries;
> - snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
> - uts.release);
> - vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
> - if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
> - goto out_fail;
> - ++vmlinux_path__nr_entries;
> +
> + /* if no symfs has been given try running kernel version too */
> + if (strlen(symbol_conf.symfs) == 0) {
Do it as:
if (!symbol_conf.symfs[1])
return 0;
And then the patch can be made smaller.
> + if (uname(&uts) < 0)
> + return -1;
> +
> + snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
> + vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
> + if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
> + goto out_fail;
> + ++vmlinux_path__nr_entries;
> + snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux",
> + uts.release);
> + vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
> + if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
> + goto out_fail;
> + ++vmlinux_path__nr_entries;
> + snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
> + uts.release);
> + vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
> + if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
> + goto out_fail;
> + ++vmlinux_path__nr_entries;
> + }
>
> return 0;
>
> diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
> index 038f220..bbe90d1 100644
> --- a/tools/perf/util/symbol.h
> +++ b/tools/perf/util/symbol.h
> @@ -85,6 +85,7 @@ struct symbol_conf {
> struct strlist *dso_list,
> *comm_list,
> *sym_list;
> + const char *symfs;
> };
>
> extern struct symbol_conf symbol_conf;
> --
> 1.7.2.3
>
> --
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