Re: [RFC][PATCH 00/12] various perf fixes

From	Peter Zijlstra <peterz@infradead.org>
Newsgroups	linux.kernel
Subject	Re: [RFC][PATCH 00/12] various perf fixes
Date	2016-02-15 18:10 +0100
Message-ID	<r2uOT-3Y1-43@gated-at.bofh.it> (permalink)
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On Mon, Feb 15, 2016 at 05:54:51PM +0100, Dmitry Vyukov wrote:
> > OK, now I have syz-fuzzer at ~950% CPU time and a gazillion syz-executor
> > tasks running.
> 
> If you want more or less, it is controlled by the "procs": 160 config parameter.

I've got 2*10 cores, each with SMT enabled for 40 'CPU's, 160 is the
4*NR_CPUS thing you suggested.

Should be good enough to keep the machine busy I suppose.

> > No splats yet, I'll leave it running for a while.
> >
> >
> > In order to get coverage support, I have to apply that one patch to my
> > local kernel, right?
> 
> Unfortunately you also need a very fresh gcc. Kcov support was
> committed to gcc in revision 231296 (Dec 4). So you either need to
> build gcc manually or obtain some kind of nightly build.

My last GCC build is 5.3-branch or so, is that fresh enough?

> Yes, you need to apply the kcov patch to kernel. It is now in
> linux-next tree, so you can pull from there.
> Enable CONFIG_KCOV and CONFIG_DEBUGFS and build kernel with 'make
> CC=your/fresh/gcc'.
> 
> And then change "cover": false in config to "cover": true.

Right, I'll see if I can pick the patch from there.

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Re: [RFC][PATCH 00/12] various perf fixes Dmitry Vyukov <dvyukov@google.com> - 2016-02-15 17:40 +0100
  Re: [RFC][PATCH 00/12] various perf fixes Dmitry Vyukov <dvyukov@google.com> - 2016-02-15 17:40 +0100
    Re: [RFC][PATCH 00/12] various perf fixes Peter Zijlstra <peterz@infradead.org> - 2016-02-15 18:00 +0100
      Re: [RFC][PATCH 00/12] various perf fixes Peter Zijlstra <peterz@infradead.org> - 2016-02-15 18:10 +0100
        Re: [RFC][PATCH 00/12] various perf fixes Peter Zijlstra <peterz@infradead.org> - 2016-02-15 19:10 +0100
          Re: [RFC][PATCH 00/12] various perf fixes Dmitry Vyukov <dvyukov@google.com> - 2016-02-15 19:40 +0100
      Re: [RFC][PATCH 00/12] various perf fixes Dmitry Vyukov <dvyukov@google.com> - 2016-02-15 18:10 +0100
  Re: [RFC][PATCH 00/12] various perf fixes Peter Zijlstra <peterz@infradead.org> - 2016-02-15 17:50 +0100
    Re: [RFC][PATCH 00/12] various perf fixes Dmitry Vyukov <dvyukov@google.com> - 2016-02-15 18:00 +0100
      Re: [RFC][PATCH 00/12] various perf fixes Peter Zijlstra <peterz@infradead.org> - 2016-02-15 18:10 +0100

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