From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1422944AbbENWjQ (ORCPT ); Thu, 14 May 2015 18:39:16 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:56527 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965372AbbENWic (ORCPT ); Thu, 14 May 2015 18:38:32 -0400 From: Arnaldo Carvalho de Melo To: Ingo Molnar Cc: linux-kernel@vger.kernel.org, He Kuang , Jiri Olsa , Peter Zijlstra , Wang Nan , Arnaldo Carvalho de Melo Subject: [PATCH 07/17] perf probe: Show better error message when failed to find variable Date: Thu, 14 May 2015 19:37:59 -0300 Message-Id: <1431643089-16176-8-git-send-email-acme@kernel.org> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1431643089-16176-1-git-send-email-acme@kernel.org> References: <1431643089-16176-1-git-send-email-acme@kernel.org> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: He Kuang 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 Acked-by: Masami Hiramatsu Cc: Jiri Olsa Cc: Peter Zijlstra Cc: Wang Nan 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 --- tools/perf/util/probe-finder.c | 10 ++++++---- 1 file 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, -- 2.1.0