linux-kernel - Re: Getting empty callchain from perf_callchain

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Message-ID: <20190522135106.GA16275@worktop.programming.kicks-ass.net>
Date:   Wed, 22 May 2019 15:51:06 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Song Liu <songliubraving@...com>
Cc:     Kairui Song <kasong@...hat.com>, Alexei Starovoitov <ast@...com>,
        lkml <linux-kernel@...r.kernel.org>,
        Kernel Team <Kernel-team@...com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>
Subject: Re: Getting empty callchain from perf_callchain_kernel()

On Mon, May 20, 2019 at 05:22:12PM +0000, Song Liu wrote:
> I think this is still the best fix/workaround here? And only one level 
> of stack trace should be OK for tracepoint? 

No. That's still completely broken.