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SubjectRe: [RFC PATCH v5 0/7] Speed booting by sorting ORC unwind tables at build time

* Peter Zijlstra <> wrote:

> On Thu, Nov 28, 2019 at 07:01:59PM +0800, Shile Zhang wrote:
> > This series refactored the original sortextable tools, add ORC unwind
> > tables sort at build time.
> >
> > To sort the ORC unwind tables(.orc_unwind & .orc_unwind_ip) can save
> > about 100ms in my test ENV (2C4G VM w/ Xeon 2.5GHz CPU).
> > It costs about 30ms sort by new sorttable tool.
> IIRC from your previous emails the new build-time sort is actually
> shorter than that, so even for single build+run scenarios we win.
> The code looks good to me, so:
> Acked-by: Peter Zijlstra (Intel) <>
> Who it going to apply this? I suppose we could take it through -tip,
> like we do with all x86 and objtool related bits.

Yeah, will apply it once the merge window slows down a bit.



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