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authorArnaldo Carvalho de Melo <acme@redhat.com>2009-07-02 21:24:14 -0300
committerIngo Molnar <mingo@elte.hu>2009-07-03 08:24:13 +0200
commit30d7a77dd5a9720430af72f6f62f5156fe073e55 (patch)
tree1b09e7b1a1d560b1604e124832bcabf6693cd4fa /tools
parent24b57c6988c5791628c89a8838910991abc9cc1e (diff)
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perf_counter tools: Adjust symbols in ET_EXEC files too
Ingo Molnar wrote: > i just bisected a 'perf report' bug that would cause us to not > resolve all user-space symbols in a 'git gc' run to: > > f5812a7a336fb952d819e4427b9a2dce02368e82 is first bad commit > commit f5812a7a336fb952d819e4427b9a2dce02368e82 > Author: Arnaldo Carvalho de Melo <acme@redhat.com> > Date: Tue Jun 30 11:43:17 2009 -0300 > > perf_counter tools: Adjust only prelinked symbol's addresses Rename ->prelinked to ->adjust_symbols and making what was done only for prelinked libraries also to ET_EXEC binaries, such as /usr/bin/git: [acme@doppio pahole]$ readelf -h /usr/bin/git | grep Type Type: EXEC (Executable file) [acme@doppio pahole]$ And after installing the 'git-debuginfo' package, I get correct results: [acme@doppio linux-2.6-tip]$ perf report --sort comm,dso,symbol -d /usr/bin/git | head -20 # # (1139614 samples) # # Overhead Command Shared Object Symbol # ........ ................ ......................... ...... # 34.98% git /usr/bin/git [.] send_sideband 33.39% git /usr/bin/git [.] enter_repo 6.81% git /usr/bin/git [.] diff_opt_parse 4.95% git /usr/bin/git [.] is_repository_shallow 3.24% git /usr/bin/git [.] odb_mkstemp 1.39% git /usr/bin/git [.] output 1.34% git /usr/bin/git [.] xmmap 1.25% git /usr/bin/git [.] receive_pack_config 1.16% git /usr/bin/git [.] git_pathdup 0.90% git /usr/bin/git [.] read_object_with_reference 0.86% git /usr/bin/git [.] show_patch_diff 0.85% git /usr/bin/git 0x00000000095e2e 0.69% git /usr/bin/git [.] display [acme@doppio linux-2.6-tip]$ I'll check what are the last cases where we can't resolve symbols, like this 0x00000000095e2e later. And I guess this will fix the problems Mike were seeing too: [acme@doppio linux-2.6-tip]$ readelf -h ../build/perf/vmlinux | grep Type Type: EXEC (Executable file) [acme@doppio linux-2.6-tip]$ Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/util/symbol.c11
-rw-r--r--tools/perf/util/symbol.h2
2 files changed, 7 insertions, 6 deletions
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 98a13114de7..4683b67b5ee 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -555,9 +555,10 @@ static int dso__load_sym(struct dso *self, int fd, const char *name,
nr_syms = shdr.sh_size / shdr.sh_entsize;
memset(&sym, 0, sizeof(sym));
- self->prelinked = elf_section_by_name(elf, &ehdr, &shdr,
- ".gnu.prelink_undo",
- NULL) != NULL;
+ self->adjust_symbols = (ehdr.e_type == ET_EXEC ||
+ elf_section_by_name(elf, &ehdr, &shdr,
+ ".gnu.prelink_undo",
+ NULL) != NULL);
elf_symtab__for_each_symbol(syms, nr_syms, index, sym) {
struct symbol *f;
u64 obj_start;
@@ -580,7 +581,7 @@ static int dso__load_sym(struct dso *self, int fd, const char *name,
section_name = elf_sec__name(&shdr, secstrs);
obj_start = sym.st_value;
- if (self->prelinked) {
+ if (self->adjust_symbols) {
if (verbose >= 2)
printf("adjusting symbol: st_value: %Lx sh_addr: %Lx sh_offset: %Lx\n",
(u64)sym.st_value, (u64)shdr.sh_addr, (u64)shdr.sh_offset);
@@ -632,7 +633,7 @@ int dso__load(struct dso *self, symbol_filter_t filter, int verbose)
if (!name)
return -1;
- self->prelinked = 0;
+ self->adjust_symbols = 0;
if (strncmp(self->name, "/tmp/perf-", 10) == 0)
return dso__load_perf_map(self, filter, verbose);
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index 4e141a30911..7918cffb23c 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -24,7 +24,7 @@ struct dso {
struct rb_root syms;
struct symbol *(*find_symbol)(struct dso *, u64 ip);
unsigned int sym_priv_size;
- unsigned char prelinked;
+ unsigned char adjust_symbols;
char name[0];
};