linux-kernel - Re: [PATCH v3 0/6] Static calls

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Message-ID: <20190111213202.v4lem2euji5cwuch@treble>
Date:   Fri, 11 Jan 2019 15:32:02 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Andy Lutomirski <luto@...nel.org>, Nadav Amit <namit@...are.com>,
        Peter Zijlstra <peterz@...radead.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Jason Baron <jbaron@...mai.com>, Jiri Kosina <jkosina@...e.cz>,
        David Laight <David.Laight@...lab.com>,
        Borislav Petkov <bp@...en8.de>,
        Julia Cartwright <julia@...com>, Jessica Yu <jeyu@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Edward Cree <ecree@...arflare.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>
Subject: Re: [PATCH v3 0/6] Static calls

On Fri, Jan 11, 2019 at 01:10:47PM -0800, Linus Torvalds wrote:
> On Fri, Jan 11, 2019 at 1:05 PM Andy Lutomirski <luto@...nel.org> wrote:
> >
> > > Yeah, my suggestion doesn't allow for batching, since it would
> > > basically generate one trampoline for every rewritten instruction.
> >
> > Sure it does.  Just make 1000 trampolines and patch 1000 sites in a
> > batch :)  As long as the number of trampolines is smallish (e.g. fits
> > in a page), then we should be in good shape.
> 
> Yeah, I guess that's true.
> 
> But let's not worry about it. I don't think we do batching for any
> alternative instruction rewriting right now, do we?

Not at the moment, but Daniel has been working on some patches to do so:

  https://lkml.kernel.org/r/cover.1545228276.git.bristot@redhat.com

-- 
Josh