linux/tools/perf/builtin-buildid-cache.c

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/*
* builtin-buildid-cache.c
*
* Builtin buildid-cache command: Manages build-id cache
*
* Copyright (C) 2010, Red Hat Inc.
* Copyright (C) 2010, Arnaldo Carvalho de Melo <acme@redhat.com>
*/
#include "builtin.h"
#include "perf.h"
#include "util/cache.h"
#include "util/debug.h"
#include "util/header.h"
#include "util/parse-options.h"
#include "util/strlist.h"
#include "util/build-id.h"
#include "util/symbol.h"
static int build_id_cache__add_file(const char *filename, const char *debugdir)
{
char sbuild_id[BUILD_ID_SIZE * 2 + 1];
u8 build_id[BUILD_ID_SIZE];
int err;
if (filename__read_build_id(filename, &build_id, sizeof(build_id)) < 0) {
pr_debug("Couldn't read a build-id in %s\n", filename);
return -1;
}
build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
perf tools: Back [vdso] DSO with real data 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 | --- 0x7fff3ace89af Following output is new report of [vdso] sample dwarf backtrace: # Overhead Command Shared Object Symbol # ........ ....... ................. ............................. # 99.52% ex [vdso] [.] 0x00000000000009af | --- 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>
2012-09-10 16:50:19 +00:00
err = build_id_cache__add_s(sbuild_id, debugdir, filename,
false, false);
if (verbose)
pr_info("Adding %s %s: %s\n", sbuild_id, filename,
err ? "FAIL" : "Ok");
return err;
}
static int build_id_cache__remove_file(const char *filename,
const char *debugdir)
{
u8 build_id[BUILD_ID_SIZE];
char sbuild_id[BUILD_ID_SIZE * 2 + 1];
int err;
if (filename__read_build_id(filename, &build_id, sizeof(build_id)) < 0) {
pr_debug("Couldn't read a build-id in %s\n", filename);
return -1;
}
build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
err = build_id_cache__remove_s(sbuild_id, debugdir);
if (verbose)
pr_info("Removing %s %s: %s\n", sbuild_id, filename,
err ? "FAIL" : "Ok");
return err;
}
int cmd_buildid_cache(int argc, const char **argv,
const char *prefix __maybe_unused)
{
struct strlist *list;
struct str_node *pos;
char debugdir[PATH_MAX];
char const *add_name_list_str = NULL,
*remove_name_list_str = NULL;
const struct option buildid_cache_options[] = {
OPT_STRING('a', "add", &add_name_list_str,
"file list", "file(s) to add"),
OPT_STRING('r', "remove", &remove_name_list_str, "file list",
"file(s) to remove"),
OPT_INCR('v', "verbose", &verbose, "be more verbose"),
OPT_END()
};
const char * const buildid_cache_usage[] = {
"perf buildid-cache [<options>]",
NULL
};
argc = parse_options(argc, argv, buildid_cache_options,
buildid_cache_usage, 0);
if (symbol__init() < 0)
return -1;
setup_pager();
perf buildid: add perfconfig option to specify buildid cache dir This patch adds the ability to specify an alternate directory to store the buildid cache (buildids, copy of binaries). By default, it is hardcoded to $HOME/.debug. This directory contains immutable data. The layout of the directory is such that no conflicts in filenames are possible. A modification in a file, yields a different buildid and thus a different location in the subdir hierarchy. You may want to put the buildid cache elsewhere because of disk space limitation or simply to share the cache between users. It is also useful for remote collect vs. local analysis of profiles. This patch adds a new config option to the perfconfig file. Under the tag 'buildid', there is a dir option. For instance, if you have: $ cat /etc/perfconfig [buildid] dir = /var/cache/perf-buildid All buildids and binaries are be saved in the directory specified. The perf record, buildid-list, buildid-cache, report, annotate, and archive commands will it to pull information out. The option can be set in the system-wide perfconfig file or in the $HOME/.perfconfig file. Cc: David S. Miller <davem@davemloft.net> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <4c055fb7.df0ce30a.5f0d.ffffae52@mx.google.com> Signed-off-by: Stephane Eranian <eranian@google.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2010-06-01 19:25:01 +00:00
snprintf(debugdir, sizeof(debugdir), "%s", buildid_dir);
if (add_name_list_str) {
list = strlist__new(true, add_name_list_str);
if (list) {
strlist__for_each(pos, list)
if (build_id_cache__add_file(pos->s, debugdir)) {
if (errno == EEXIST) {
pr_debug("%s already in the cache\n",
pos->s);
continue;
}
pr_warning("Couldn't add %s: %s\n",
pos->s, strerror(errno));
}
strlist__delete(list);
}
}
if (remove_name_list_str) {
list = strlist__new(true, remove_name_list_str);
if (list) {
strlist__for_each(pos, list)
if (build_id_cache__remove_file(pos->s, debugdir)) {
if (errno == ENOENT) {
pr_debug("%s wasn't in the cache\n",
pos->s);
continue;
}
pr_warning("Couldn't remove %s: %s\n",
pos->s, strerror(errno));
}
strlist__delete(list);
}
}
return 0;
}