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| From | Masami Hiramatsu <mhiramat@kernel.org> |
| Newsgroups | linux.kernel |
| Subject | [PATCH perf/core 1/4] perf-probe: Fix to show correct locations for events on modules |
| Date | Sat, 07 Jan 2017 06:30:02 +0100 |
| Message-ID | <sWRJM-4oE-5@gated-at.bofh.it> (permalink) |
| References | <sWRJL-4oE-3@gated-at.bofh.it> |
| X-Original-To | Arnaldo Carvalho de Melo <acme@kernel.org> |
| X-Mailer | git-send-email 2.9.3 |
| User-Agent | StGit/0.17.1-dirty |
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| Sender | robomod@news.nic.it |
| List-ID | <linux-kernel.vger.kernel.org> |
| X-Mailing-List | linux-kernel@vger.kernel.org |
| Approved | robomod@news.nic.it |
| Lines | 49 |
| Organization | linux.* mail to news gateway |
| X-Original-Cc | Masami Hiramatsu <mhiramat@kernel.org>, linux-kernel@vger.kernel.org, Jiri Olsa <jolsa@redhat.com>, Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@redhat.com>, Namhyung Kim <namhyung@kernel.org> |
| X-Original-Date | Sat, 7 Jan 2017 14:25:09 +0900 |
| X-Original-Message-ID | <148376669886.25966.17841653117657415248.stgit@devbox> |
| X-Original-References | <148376662676.25966.3739385839519573153.stgit@devbox> |
| X-Original-Sender | linux-kernel-owner@vger.kernel.org |
| Xref | csiph.com linux.kernel:1553587 |
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Fix to show correct locations for events on modules by
relocating given address. Currently the relocation is
done when we failed to find the address in debuginfo,
but for modules it always makes a mistakes.
E.g. without this fix, events on module seems wrong,
but other cases (kernel and user space) looks good.
# perf probe -l
probe:SyS_remap_file_pages (on SyS_remap_file_pages@mm/mmap.c)
probe:chv_prepare_pll (on intel_plane_atomic_get_property+16@drm/i915/intel_atomic_plane.c in i915)
probe_perf:alias_lookup (on alias_lookup@util/alias.c in /home/mhiramat/ksrc/linux/tools/perf/perf)
With this fix, all cases are OK now.
# perf probe -l
probe:SyS_remap_file_pages (on SyS_remap_file_pages@mm/mmap.c)
probe:chv_prepare_pll (on chv_prepare_pll@gpu/drm/i915/intel_display.c in i915)
probe_perf:alias_lookup (on alias_lookup@util/alias.c in /home/mhiramat/ksrc/linux/tools/perf/perf)
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
tools/perf/util/probe-finder.c | 10 +++-------
1 file changed, 3 insertions(+), 7 deletions(-)
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index df4debe..0278fe1 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -1543,16 +1543,12 @@ int debuginfo__find_probe_point(struct debuginfo *dbg, unsigned long addr,
Dwarf_Addr _addr = 0, baseaddr = 0;
const char *fname = NULL, *func = NULL, *basefunc = NULL, *tmp;
int baseline = 0, lineno = 0, ret = 0;
- bool reloc = false;
-retry:
+ /* We always need to relocate the address for aranges */
+ if (debuginfo__get_text_offset(dbg, &baseaddr) == 0)
+ addr += baseaddr;
/* Find cu die */
if (!dwarf_addrdie(dbg->dbg, (Dwarf_Addr)addr, &cudie)) {
- if (!reloc && debuginfo__get_text_offset(dbg, &baseaddr) == 0) {
- addr += baseaddr;
- reloc = true;
- goto retry;
- }
pr_warning("Failed to find debug information for address %lx\n",
addr);
ret = -EINVAL;
Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread
[PATCH perf/core 1/4] perf-probe: Fix to show correct locations for events on modules Masami Hiramatsu <mhiramat@kernel.org> - 2017-01-07 06:30 +0100
Re: [PATCH perf/core 1/4] perf-probe: Fix to show correct locations for events on modules Arnaldo Carvalho de Melo <acme@kernel.org> - 2017-01-10 14:20 +0100
Re: [PATCH perf/core 1/4] perf-probe: Fix to show correct locations for events on modules Masami Hiramatsu <mhiramat@kernel.org> - 2017-01-10 15:20 +0100
Re: [PATCH perf/core 1/4] perf-probe: Fix to show correct locations for events on modules Masami Hiramatsu <mhiramat@kernel.org> - 2017-01-11 01:00 +0100
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