[Crash-utility] [RFC PATCH 0/1] support lockless printk ringbuffer

[HAGIO KAZUHITO(萩尾 一仁)]

Hi John,

> -----Original Message-----
> Hi Kazu,
> 
> Here is a patch adding full support for the new lockless printk
> ringbuffer as it is currently being proposed. Note that the latest
> version has not yet been submitted to LKML. I was waiting until I
> finished tests with crash(8) and makedumpfile(8).
> 
> The new ringbuffer will export all the necessary symbols, sizes,
> and offsets in VMCOREINFO.
> 
> Note that I created a separate printk.c for the iteration logic.

That's good.

> 
> Also note that I modified dwarf_info.c to support resolving
> typedefs of typedefs. This was necessary in order to support
> atomic_long_t and its "counter" member.

OK, I see.

> 
> I don't expect you to take the patch as-is, but I hope it can
> provide some positive ground work for moving forward.

OK.  It looks already well-considered.
Thank you very much for the patch!

Kazu

> 
> John Ogness (1):
>   printk: add support for lockless ringbuffer
> 
>  Makefile       |   2 +-
>  dwarf_info.c   |  36 +++++++++-
>  makedumpfile.c | 101 ++++++++++++++++++++++++++--
>  makedumpfile.h |  25 +++++++
>  printk.c       | 177 +++++++++++++++++++++++++++++++++++++++++++++++++
>  5 files changed, 333 insertions(+), 8 deletions(-)
>  create mode 100644 printk.c
> 
> --
> 2.20.1