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Re: [RFC PATCH 00/10] x86: undwarf unwinder

From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: [RFC PATCH 00/10] x86: undwarf unwinder
Date 2017-06-01 14:20 +0200
Message-ID <tNxf3-2qB-9@gated-at.bofh.it> (permalink)
References <tNr9D-6Ua-3@gated-at.bofh.it> <tNrt0-7fK-17@gated-at.bofh.it> <tNwVI-24Q-11@gated-at.bofh.it>
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On Thu, Jun 01, 2017 at 06:58:20AM -0500, Josh Poimboeuf wrote:
> > Being able to generate more optimal code in the hottest code paths of the kernel 
> > is the _real_, primary upstream kernel benefit of a different debuginfo method - 
> > which has to be weighed against the pain of introducing a new unwinder. But this 
> > submission does not talk about that aspect at all, which should be fixed I think.
> 
> Actually I devoted an entire one-sentence paragraph to performance in
> the documentation:
> 
>   The simpler debuginfo format also enables the unwinder to be relatively
>   fast, which is important for perf and lockdep.
> 
> But I'll try to highlight that a little more.

That's relative to a DWARF unwinder. It doesn't appear to be possible to
get anywhere near a frame-pointer unwinder due to having to do this
log(n) lookup for every single frame.

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[RFC PATCH 00/10] x86: undwarf unwinder Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 07:50 +0200
  [RFC PATCH 06/10] x86/entry: add CFI hint undwarf annotations Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 07:50 +0200
    Re: [RFC PATCH 06/10] x86/entry: add CFI hint undwarf annotations Andy Lutomirski <luto@kernel.org> - 2017-06-01 16:10 +0200
      Re: [RFC PATCH 06/10] x86/entry: add CFI hint undwarf annotations Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 16:30 +0200
        Re: [RFC PATCH 06/10] x86/entry: add CFI hint undwarf annotations Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 16:30 +0200
          Re: [RFC PATCH 06/10] x86/entry: add CFI hint undwarf annotations Andy Lutomirski <luto@kernel.org> - 2017-06-01 16:50 +0200
            Re: [RFC PATCH 06/10] x86/entry: add CFI hint undwarf annotations Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 17:10 +0200
  [RFC PATCH 09/10] extable: add undwarf table sorting ability to sorttable script Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 07:50 +0200
  [RFC PATCH 08/10] extable: rename 'sortextable' script to 'sorttable' Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 07:50 +0200
  [RFC PATCH 05/10] objtool, x86: add facility for asm code to provide CFI hints Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 07:50 +0200
    Re: [RFC PATCH 05/10] objtool, x86: add facility for asm code to  provide CFI hints Andy Lutomirski <luto@kernel.org> - 2017-06-01 16:00 +0200
      Re: [RFC PATCH 05/10] objtool, x86: add facility for asm code to  provide CFI hints Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 16:20 +0200
        Re: [RFC PATCH 05/10] objtool, x86: add facility for asm code to  provide CFI hints Andy Lutomirski <luto@kernel.org> - 2017-06-01 16:50 +0200
          Re: [RFC PATCH 05/10] objtool, x86: add facility for asm code to  provide CFI hints Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 17:10 +0200
  [RFC PATCH 01/10] objtool: move checking code to check.c Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 07:50 +0200
  [RFC PATCH 07/10] x86/asm: add CFI hint annotations to sync_core() Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 07:50 +0200
  [RFC PATCH 04/10] objtool: add undwarf debuginfo generation Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 07:50 +0200
  [RFC PATCH 10/10] x86/unwind: add undwarf unwinder Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 07:50 +0200
    Re: [RFC PATCH 10/10] x86/unwind: add undwarf unwinder Peter Zijlstra <peterz@infradead.org> - 2017-06-01 13:10 +0200
      Re: [RFC PATCH 10/10] x86/unwind: add undwarf unwinder Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 14:30 +0200
        Re: [RFC PATCH 10/10] x86/unwind: add undwarf unwinder Jiri Slaby <jslaby@suse.cz> - 2017-06-01 14:50 +0200
          Re: [RFC PATCH 10/10] x86/unwind: add undwarf unwinder Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 15:10 +0200
          Re: [RFC PATCH 10/10] x86/unwind: add undwarf unwinder Peter Zijlstra <peterz@infradead.org> - 2017-06-01 15:50 +0200
        Re: [RFC PATCH 10/10] x86/unwind: add undwarf unwinder Peter Zijlstra <peterz@infradead.org> - 2017-06-01 15:20 +0200
    Re: [RFC PATCH 10/10] x86/unwind: add undwarf unwinder Peter Zijlstra <peterz@infradead.org> - 2017-06-01 14:20 +0200
      Re: [RFC PATCH 10/10] x86/unwind: add undwarf unwinder Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 14:40 +0200
        Re: [RFC PATCH 10/10] x86/unwind: add undwarf unwinder Peter Zijlstra <peterz@infradead.org> - 2017-06-01 15:20 +0200
          Re: [RFC PATCH 10/10] x86/unwind: add undwarf unwinder Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 17:10 +0200
  [RFC PATCH 02/10] objtool, x86: add several functions and files to the objtool whitelist Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 07:50 +0200
  Re: [RFC PATCH 00/10] x86: undwarf unwinder Ingo Molnar <mingo@kernel.org> - 2017-06-01 08:10 +0200
    Re: [RFC PATCH 00/10] x86: undwarf unwinder Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 14:00 +0200
      Re: [RFC PATCH 00/10] x86: undwarf unwinder Peter Zijlstra <peterz@infradead.org> - 2017-06-01 14:20 +0200
        Re: [RFC PATCH 00/10] x86: undwarf unwinder Jiri Slaby <jslaby@suse.cz> - 2017-06-01 14:40 +0200
          Re: [RFC PATCH 00/10] x86: undwarf unwinder Jiri Slaby <jslaby@suse.cz> - 2017-06-01 15:00 +0200
          Re: [RFC PATCH 00/10] x86: undwarf unwinder Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 15:00 +0200
        Re: [RFC PATCH 00/10] x86: undwarf unwinder Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 14:50 +0200
          Re: [RFC PATCH 00/10] x86: undwarf unwinder Peter Zijlstra <peterz@infradead.org> - 2017-06-01 15:30 +0200
            Re: [RFC PATCH 00/10] x86: undwarf unwinder Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2017-06-06 16:20 +0200
          Re: [RFC PATCH 00/10] x86: undwarf unwinder Andy Lutomirski <luto@kernel.org> - 2017-06-01 16:00 +0200
      Re: [RFC PATCH 00/10] x86: undwarf unwinder Ingo Molnar <mingo@kernel.org> - 2017-06-01 16:00 +0200
        Re: [RFC PATCH 00/10] x86: undwarf unwinder Jiri Slaby <jslaby@suse.cz> - 2017-06-01 16:00 +0200
          Re: [RFC PATCH 00/10] x86: undwarf unwinder Jiri Slaby <jslaby@suse.cz> - 2017-06-02 10:40 +0200
        Re: [RFC PATCH 00/10] x86: undwarf unwinder Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 16:10 +0200
        Re: [RFC PATCH 00/10] x86: undwarf unwinder Jiri Slaby <jslaby@suse.cz> - 2017-06-01 16:10 +0200
          Re: [RFC PATCH 00/10] x86: undwarf unwinder Mel Gorman <mgorman@suse.de> - 2017-06-02 12:50 +0200

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