7dbf4dcfe2
Storing data for VDSO shared object, because we need it for the post
unwind processing.
The VDSO shared object is same for all process on a running system, so
it makes no difference when we store it inside the tracer - perf.
When [vdso] map memory is hit, we retrieve [vdso] DSO image and store it
into temporary file.
During the build-id processing phase, the [vdso] DSO image is stored in
build-id db, and build-id reference is made inside perf.data. The
build-id vdso file object is called '[vdso]'. We don't use temporary
file name which gets removed when record is finished.
During report phase the vdso build-id object is treated as any other
build-id DSO object.
Adding following API for vdso object:
bool is_vdso_map(const char *filename)
- returns true if the filename matches vdso map name
struct dso *vdso__dso_findnew(struct list_head *head)
- find/create proper vdso DSO object
vdso__exit(void)
- removes temporary VDSO image if there's any
This change makes backtrace dwarf post unwind possible from [vdso] maps.
Following output is current report of [vdso] sample dwarf backtrace:
# Overhead Command Shared Object Symbol
# ........ ....... ................. .............................
#
99.52% ex [vdso] [.] 0x00007fff3ace89af
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--- 0x7fff3ace89af
Following output is new report of [vdso] sample dwarf backtrace:
# Overhead Command Shared Object Symbol
# ........ ....... ................. .............................
#
99.52% ex [vdso] [.] 0x00000000000009af
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--- 0x7fff3ace89af
main
__libc_start_main
_start
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1347295819-23177-5-git-send-email-jolsa@redhat.com
[ committer note: s/ALIGN/PERF_ALIGN/g to cope with the android build changes ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
133 lines
3.2 KiB
C
133 lines
3.2 KiB
C
/*
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* builtin-buildid-cache.c
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*
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* Builtin buildid-cache command: Manages build-id cache
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*
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* Copyright (C) 2010, Red Hat Inc.
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* Copyright (C) 2010, Arnaldo Carvalho de Melo <acme@redhat.com>
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*/
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#include "builtin.h"
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#include "perf.h"
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#include "util/cache.h"
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#include "util/debug.h"
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#include "util/header.h"
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#include "util/parse-options.h"
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#include "util/strlist.h"
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#include "util/symbol.h"
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static char const *add_name_list_str, *remove_name_list_str;
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static const char * const buildid_cache_usage[] = {
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"perf buildid-cache [<options>]",
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NULL
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};
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static const struct option buildid_cache_options[] = {
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OPT_STRING('a', "add", &add_name_list_str,
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"file list", "file(s) to add"),
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OPT_STRING('r', "remove", &remove_name_list_str, "file list",
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"file(s) to remove"),
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OPT_INCR('v', "verbose", &verbose, "be more verbose"),
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OPT_END()
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};
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static int build_id_cache__add_file(const char *filename, const char *debugdir)
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{
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char sbuild_id[BUILD_ID_SIZE * 2 + 1];
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u8 build_id[BUILD_ID_SIZE];
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int err;
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if (filename__read_build_id(filename, &build_id, sizeof(build_id)) < 0) {
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pr_debug("Couldn't read a build-id in %s\n", filename);
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return -1;
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}
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build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
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err = build_id_cache__add_s(sbuild_id, debugdir, filename,
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false, false);
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if (verbose)
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pr_info("Adding %s %s: %s\n", sbuild_id, filename,
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err ? "FAIL" : "Ok");
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return err;
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}
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static int build_id_cache__remove_file(const char *filename __used,
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const char *debugdir __used)
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{
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u8 build_id[BUILD_ID_SIZE];
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char sbuild_id[BUILD_ID_SIZE * 2 + 1];
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int err;
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if (filename__read_build_id(filename, &build_id, sizeof(build_id)) < 0) {
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pr_debug("Couldn't read a build-id in %s\n", filename);
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return -1;
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}
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build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
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err = build_id_cache__remove_s(sbuild_id, debugdir);
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if (verbose)
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pr_info("Removing %s %s: %s\n", sbuild_id, filename,
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err ? "FAIL" : "Ok");
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return err;
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}
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static int __cmd_buildid_cache(void)
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{
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struct strlist *list;
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struct str_node *pos;
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char debugdir[PATH_MAX];
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snprintf(debugdir, sizeof(debugdir), "%s", buildid_dir);
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if (add_name_list_str) {
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list = strlist__new(true, add_name_list_str);
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if (list) {
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strlist__for_each(pos, list)
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if (build_id_cache__add_file(pos->s, debugdir)) {
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if (errno == EEXIST) {
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pr_debug("%s already in the cache\n",
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pos->s);
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continue;
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}
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pr_warning("Couldn't add %s: %s\n",
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pos->s, strerror(errno));
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}
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strlist__delete(list);
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}
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}
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if (remove_name_list_str) {
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list = strlist__new(true, remove_name_list_str);
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if (list) {
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strlist__for_each(pos, list)
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if (build_id_cache__remove_file(pos->s, debugdir)) {
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if (errno == ENOENT) {
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pr_debug("%s wasn't in the cache\n",
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pos->s);
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continue;
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}
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pr_warning("Couldn't remove %s: %s\n",
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pos->s, strerror(errno));
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}
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strlist__delete(list);
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}
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}
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return 0;
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}
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int cmd_buildid_cache(int argc, const char **argv, const char *prefix __used)
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{
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argc = parse_options(argc, argv, buildid_cache_options,
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buildid_cache_usage, 0);
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if (symbol__init() < 0)
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return -1;
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setup_pager();
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return __cmd_buildid_cache();
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}
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