linux-kernel - Re: [RFC v2 0/6] x86: dynamic indirect branch promotion

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Message-ID: <20190108205341.GO6118@tassilo.jf.intel.com>
Date:   Tue, 8 Jan 2019 12:53:41 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     Nadav Amit <nadav.amit@...il.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ingo Molnar <mingo@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Edward Cree <ecree@...arflare.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        songliubraving@...com
Subject: Re: [RFC v2 0/6] x86: dynamic indirect branch promotion

> BTW: I am not sure that static-keys are much better. Their change also
> affects the control flow, and they do affect the control flow.

Static keys have the same problem, but they only change infrequently so usually
it's not too big a problem if you dump the kernel close to the tracing 
sessions.

simple-pt doesn't have a similar mechanism, so it suffers more from it.

-Andi