linux-kernel - Re: [PATCH v3 00/57] Scope-based Resource Management

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Date:   Mon, 12 Jun 2023 11:51:59 +0200
From:   Peter Zijlstra <peterz@...radead.org>
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Subject: Re: [PATCH v3 00/57] Scope-based Resource Management

On Mon, Jun 12, 2023 at 11:07:13AM +0200, Peter Zijlstra wrote:
> Hi,
> 
> After a wee bit of bike-shedding on the syntax/API of the thing I think we're
> in a reasonable shape.
> 
> There's still the no_free_ptr() vs take_ptr() thing, but that can be easily
> sorted with a little script over the patches if we reach consensus.
> 
> I've taken to converting kernel/sched/core.c and kernel/events/core.c to see
> how well this stuff actually works. Unlike last time, I've split them up into a
> gazillion little patches. Both for my sanity -- bisect is genius when you're
> trying to debug stuff in the middle of the night as well as reviewer sanity.
> 
> These are by no means 'complete' convertions, I've mostly focussed on functions
> that had 'goto' in them. Since that's a large part of why I started on all this.
> 
> x86_x64-defconfig boots and passes perf test. I'll go figure out how to point
> syzcaller at it.
> 
> The patches have gone through a few cycles of 0day over the weekend, and mostly
> builds fine now.
> 
> Dan Carpenter poked me about how sparse doesn't yet understand the __cleanup__
> attribute and seems to suffer from decl-after-stmt issues, so that might be
> something that needs attention.
> 
> Anyway, does this look like something we can live with?

Forgot to mention; also available at:

  git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git core/guards2

(core/guards also exists, but that is a previous version that I kept
because I wanted to discuss some 'interesting' clang build fails)

> 
> ---
>  Makefile                            |    6 +-
>  arch/arm64/kernel/vdso32/Makefile   |    2 -
>  drivers/dma/ioat/dma.c              |   12 +-
>  include/linux/cleanup.h             |  167 ++++
>  include/linux/compiler-clang.h      |    9 +
>  include/linux/compiler_attributes.h |    6 +
>  include/linux/cpu.h                 |    2 +
>  include/linux/device.h              |    7 +
>  include/linux/file.h                |   11 +
>  include/linux/irqflags.h            |    7 +
>  include/linux/mutex.h               |    4 +
>  include/linux/percpu.h              |    4 +
>  include/linux/perf_event.h          |   14 +-
>  include/linux/preempt.h             |    5 +
>  include/linux/rcupdate.h            |    3 +
>  include/linux/rwsem.h               |    8 +
>  include/linux/sched/task.h          |    2 +
>  include/linux/slab.h                |    3 +
>  include/linux/spinlock.h            |   31 +
>  include/linux/srcu.h                |    5 +
>  kernel/events/core.c                | 1642 +++++++++++++++--------------------
>  kernel/sched/core.c                 |  931 +++++++++-----------
>  kernel/sched/sched.h                |   40 +
>  scripts/checkpatch.pl               |    2 +-
>  security/apparmor/include/lib.h     |    6 +-
>  25 files changed, 1433 insertions(+), 1496 deletions(-)
>