From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from szxga05-in.huawei.com (szxga05-in.huawei.com [45.249.212.191]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8F87D26ACD; Tue, 25 Jun 2024 03:38:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.191 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719286689; cv=none; b=ogiqOCnO6Lf2QTxMB7aAatGECIEkv2Gls2aAmRO7DR6DzTBd5MQCxIBGiZiKDgu4g7G3mRrOVb8KOO1ZP5p0Y8NGVHKzUdLxr5rWT9V0F/BiNWhccwUdThvEg4Oe7fe046u6umfx1LFl3qaqKphwqpp1nzNz7RO6866rl/SZZy8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719286689; c=relaxed/simple; bh=dszVw76g6BcOGNPoIPoOuFqo3nET3iG/lHb4lRNIeiQ=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=thuERU86niRZNnTnp5F4UBLBX/60SJhkTtJ0G0EPAjyNaXAFYj5M3NB6SfYnt+c9hkGkU2BYgAO9Dd2KRIY83HOSdXARyDCu145drKetG/rox/kQxy9ORuokqwptCWL8ZXE4OpNQc9kg1YSB5K5lAnvzsxAsbgIlBin1XMtKEic= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=45.249.212.191 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.162.112]) by szxga05-in.huawei.com (SkyGuard) with ESMTP id 4W7Vpx1bcGz2FbCJ; Tue, 25 Jun 2024 11:35:53 +0800 (CST) Received: from kwepemd100011.china.huawei.com (unknown [7.221.188.204]) by mail.maildlp.com (Postfix) with ESMTPS id 312E2140109; Tue, 25 Jun 2024 11:38:02 +0800 (CST) Received: from M910t.huawei.com (10.110.54.157) by kwepemd100011.china.huawei.com (7.221.188.204) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1258.34; Tue, 25 Jun 2024 11:38:00 +0800 From: Changbin Du To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Nathan Chancellor CC: Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , "Liang, Kan" , Nick Desaulniers , Bill Wendling , Justin Stitt , , , , Changbin Du Subject: [PATCH v4 0/5] perf: support specify vdso path in cmdline Date: Tue, 25 Jun 2024 11:37:35 +0800 Message-ID: <20240625033740.223009-1-changbin.du@huawei.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) To kwepemd100011.china.huawei.com (7.221.188.204) The vdso dumped from process memory (in buildid-cache) lacks debugging info. To annotate vdso symbols with source lines we need specify a debugging version. For x86, we can find them from your local build as 'arch/x86/entry/vdso/vdso{32,64}.so.dbg'. Or they may resides in '/lib/modules//vdso/vdso{32,64}.so' on Ubuntu. But notice that the builid has to match. If user doesn't specify the path, perf will search them internally as long as vmlinux. Below samples are captured on my local build kernel. perf succesfully find debugging version vdso and we can annotate with source without specifying vdso path. $ sudo perf record -a $ sudo perf report --objdump=llvm-objdump Samples: 17K of event 'cycles:P', 4000 Hz, Event count (approx.): 1760 __vdso_clock_gettime /work/linux-host/arch/x86/entry/vdso/vdso64.so.d Percent│ movq -48(%rbp),%rsi │ testq %rax,%rax │ ; return vread_hvclock(); │ movq %rax,%rdx │ ; if (unlikely(!vdso_cycles_ok(cycles))) │ ↑ js eb │ ↑ jmp 74 │ ; ts->tv_sec = vdso_ts->sec; 0.02 │147: leaq 2(%rbx),%rax │ shlq $4, %rax │ addq %r10,%rax │ ; while ((seq = READ_ONCE(vd->seq)) & 1) { 9.38 │152: movl (%r10),%ecx When doing cross platform analysis, we need to specify the vdso path if we are interested in its symbols. At most two vdso can be given. $ sudo perf report --objdump=llvm-objdump \ --vdso arch/x86/entry/vdso/vdso64.so.dbg,arch/x86/entry/vdso/vdso32.so.dbg v4: - split the refactoring from the actual change. v3: - update documentation. v2: - now search vdso automatically as long as vmlinux, as suggested by Adrian. - remove change 'prefer symsrc_filename for filename'. Changbin Du (5): perf: support specify vdso path in cmdline perf: disasm: refactor function dso__disassemble_filename perf: disasm: use build_id_path if fallback failed perf: symbol: generalize vmlinux path searching perf: symbol: try to seach vdso path if not given by user tools/perf/Documentation/perf-annotate.txt | 3 + tools/perf/Documentation/perf-c2c.txt | 3 + tools/perf/Documentation/perf-inject.txt | 3 + tools/perf/Documentation/perf-report.txt | 3 + tools/perf/Documentation/perf-script.txt | 3 + tools/perf/Documentation/perf-top.txt | 3 + tools/perf/builtin-annotate.c | 3 + tools/perf/builtin-c2c.c | 2 + tools/perf/builtin-inject.c | 2 + tools/perf/builtin-kallsyms.c | 2 + tools/perf/builtin-probe.c | 2 + tools/perf/builtin-report.c | 2 + tools/perf/builtin-script.c | 2 + tools/perf/builtin-top.c | 4 + tools/perf/tests/builtin-test.c | 3 +- tools/perf/util/disasm.c | 122 +++++++---- tools/perf/util/machine.c | 4 +- tools/perf/util/symbol.c | 233 ++++++++++++++++----- tools/perf/util/symbol.h | 9 +- tools/perf/util/symbol_conf.h | 6 + 20 files changed, 312 insertions(+), 102 deletions(-) -- 2.34.1