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| author | He Kuang <hekuang@huawei.com> | 2015-05-11 11:25:04 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2015-05-12 14:59:50 +0200 |
| commit | 7d5eaba9b33682b734e3a79c21c4a9a5f91624b1 (patch) | |
| tree | a8dcdfd13dde51b48d41cb1c6747e98ae326db34 /tools/perf/util/probe-finder.c | |
| parent | perf probe: Add --range option to show a variable's location range (diff) | |
| download | linux-7d5eaba9b33682b734e3a79c21c4a9a5f91624b1.tar.xz linux-7d5eaba9b33682b734e3a79c21c4a9a5f91624b1.zip | |
perf probe: Show better error message when failed to find variable
Indicate to check variable location range in error message when we got
failed to find the variable.
Before this patch:
$ perf probe --add 'generic_perform_write+118 bytes'
Failed to find the location of bytes at this address.
Perhaps, it has been optimized out.
Error: Failed to add events.
After this patch:
$ perf probe --add 'generic_perform_write+118 bytes'
Failed to find the location of the 'bytes' variable at this address.
Perhaps it has been optimized out.
Use -V with the --range option to show 'bytes' location range.
Error: Failed to add events.
Signed-off-by: He Kuang <hekuang@huawei.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1431336304-16863-3-git-send-email-hekuang@huawei.com
[ Improve the error message based on lkml thread ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/probe-finder.c')
| -rw-r--r-- | tools/perf/util/probe-finder.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c index 5804086425aa..590a24a7f555 100644 --- a/tools/perf/util/probe-finder.c +++ b/tools/perf/util/probe-finder.c @@ -527,10 +527,12 @@ static int convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf) ret = convert_variable_location(vr_die, pf->addr, pf->fb_ops, &pf->sp_die, pf->tvar); - if (ret == -ENOENT || ret == -EINVAL) - pr_err("Failed to find the location of %s at this address.\n" - " Perhaps, it has been optimized out.\n", pf->pvar->var); - else if (ret == -ENOTSUP) + if (ret == -ENOENT || ret == -EINVAL) { + pr_err("Failed to find the location of the '%s' variable at this address.\n" + " Perhaps it has been optimized out.\n" + " Use -V with the --range option to show '%s' location range.\n", + pf->pvar->var, pf->pvar->var); + } else if (ret == -ENOTSUP) pr_err("Sorry, we don't support this variable location yet.\n"); else if (ret == 0 && pf->pvar->field) { ret = convert_variable_fields(vr_die, pf->pvar->var, |