Commit 5baecbcd authored by Dima Kogan's avatar Dima Kogan Committed by Arnaldo Carvalho de Melo

perf symbols: we can now read separate debug-info files based on a build ID

Recent GDB (at least on a vanilla Debian box) looks for debug information in

  /usr/lib/debug/.build-id/nn/nnnnnnn

where nn/nnnnnn is the build-id of the stripped ELF binary. This is
documented here:

  https://sourceware.org/gdb/onlinedocs/gdb/Separate-Debug-Files.html

This was not working in perf because we didn't read the build id until
AFTER we searched for the separate debug information file. This patch
reads the build ID and THEN does the search.
Signed-off-by: default avatarDima Kogan <dima@secretsauce.net>
Link: http://lkml.kernel.org/r/87si6pfwz4.fsf@secretsauce.netSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent f2f30968
...@@ -1406,6 +1406,7 @@ int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter) ...@@ -1406,6 +1406,7 @@ int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
struct symsrc ss_[2]; struct symsrc ss_[2];
struct symsrc *syms_ss = NULL, *runtime_ss = NULL; struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
bool kmod; bool kmod;
unsigned char build_id[BUILD_ID_SIZE];
pthread_mutex_lock(&dso->lock); pthread_mutex_lock(&dso->lock);
...@@ -1461,6 +1462,14 @@ int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter) ...@@ -1461,6 +1462,14 @@ int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE || dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE ||
dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP; dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
/*
* Read the build id if possible. This is required for
* DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work
*/
if (filename__read_build_id(dso->name, build_id, BUILD_ID_SIZE) > 0)
dso__set_build_id(dso, build_id);
/* /*
* Iterate over candidate debug images. * Iterate over candidate debug images.
* Keep track of "interesting" ones (those which have a symtab, dynsym, * Keep track of "interesting" ones (those which have a symtab, dynsym,
......
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