From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 CC73828C5D9; Mon, 30 Jun 2025 16:35:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751301321; cv=none; b=a7KlUb0EC6HvPstlZjn2v73jP6ddUZPmrcwkabbGC/Kg7lvKgBr8Aky90ylG8meGd55d4xjyzi9oK/S/HF7Vmolsmg2SurB9FhXUGs+vomu2gwy9mJYSgOKLON1Q8zJYpyADBfBze8WeKpkNE/8qUuLe+Uuyxrsrpe7vnURABU8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751301321; c=relaxed/simple; bh=SIsBG0bE6nVpLYGGzrorldUCYalfWsYLdprcRg+JujY=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=GLNZ6ip1V3sJdJik45ONmYVRUcRFyYjcwoFWEFPUkzncxjLwck7sgTHQnspUGMCrlsdYpWMfTgpTko+RlwlF7Yg0HXY8U8Do0669PkKqjPc+i3RM1qit6GsUeneQM10uU9VXRMrtXkWl9LAvdsT+LrDpY1RIKJLVJKEcEVYBNC0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=qtD4F3rz; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="qtD4F3rz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8D63AC4CEE3; Mon, 30 Jun 2025 16:35:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1751301321; bh=SIsBG0bE6nVpLYGGzrorldUCYalfWsYLdprcRg+JujY=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=qtD4F3rz1jSJAySp7brJDviaCYCb1oXFEXYzexxwNzUm777WkleHoLoaCHvPVnJ3U 8ikDP69a8TG5SfA5ZuAH6+jVCuoMs/57eT+rmfgjebWE7eswSvRcLei39T5nCSkr9M ISgeOsazaBwnjbx2Uyi/NfEONkF0lLRjF9cAV8129aV4VZdvF2u6mRjTIShRd5jLGm 9geP1aoN7pYIE5xc4RszrodEFOt9v6NoV9WcxqKO4bAQ54mo49iMCfPE5bVB5Xa09M AJJW67Fn/5+7gX5c/N1DQhR5uXc5aLytVWZf7tcq/rYZSCdNRj1Ag36QTJH1AduRav a23zkXX8prl9g== Date: Mon, 30 Jun 2025 09:35:19 -0700 From: Namhyung Kim To: Florian Weimer Cc: Steven Rostedt , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, bpf@vger.kernel.org, x86@kernel.org, Masami Hiramatsu , Mathieu Desnoyers , Josh Poimboeuf , Peter Zijlstra , Ingo Molnar , Jiri Olsa , Thomas Gleixner , Andrii Nakryiko , Indu Bhagat , "Jose E. Marchesi" , Beau Belgrave , Jens Remus , Linus Torvalds , Andrew Morton , Jens Axboe Subject: Re: [PATCH v11 00/14] unwind_user: x86: Deferred unwinding infrastructure Message-ID: References: <20250625225600.555017347@goodmis.org> <878ql9mlzn.fsf@oldenburg.str.redhat.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <878ql9mlzn.fsf@oldenburg.str.redhat.com> Hello, On Mon, Jun 30, 2025 at 02:50:52PM +0200, Florian Weimer wrote: > * Steven Rostedt: > > > SFrames is now supported in gcc binutils and soon will also be supported > > by LLVM. > > Is the LLVM support discussed here? > > [RFC] Adding SFrame support to llvm > > > Or is there a secone effort? > > > I have more patches on top of this series that add perf support, ftrace > > support, sframe support and the x86 fix ups (for VDSO). But each of those > > patch series can be worked on independently, but they all depend on this > > series (although the x86 specific patches at the end isn't necessarily > > needed, at least for other architectures). > > Related to perf support: I'm writing up the SFrame change proposal for > Fedora, and I want to include testing instructions. Any idea yet what a > typical “perf top” or “perf report” command line would look like? I think you can run "perf report -s dso,sym -g none" then it will show "Children" and "Self" overheads. If callchain in userspace works ok, you will get non-kernel entries (symbols start with "[.]") having more children overhead than the self. $ perf record -g -- perf bench sched messaging $ perf report -s dso,sym -g none | grep -F -e Children -e '[.]' | head # Children Self Shared Object Symbol 63.09% 0.01% perf [.] run_bench 63.09% 0.00% libc.so.6 [.] __libc_start_call_main 63.09% 0.00% perf [.] cmd_bench 63.09% 0.00% perf [.] handle_internal_command 63.09% 0.00% perf [.] main 63.09% 0.00% perf [.] run_argv 63.09% 0.00% perf [.] run_builtin 63.02% 0.00% perf [.] bench_sched_messaging 62.79% 0.00% perf [.] group Thanks, Namhyung