Re: [PATCH v6 0/8] RISC-V: Apply Zicboz to clear_page

Andrew Jones
2023-03-15T08:54:14Z

On Tue, Mar 14, 2023 at 09:35:09PM -0700, Palmer Dabbelt wrote:
> On Fri, 24 Feb 2023 08:26:23 PST (-0800), ajones@ventanamicro.com wrote:
> > When the Zicboz extension is available we can more rapidly zero naturally
> > aligned Zicboz block sized chunks of memory. As pages are always page
>
> I guess we're sort of in a grey area here: this is just a performance thing
> so in theory some sort of benchmark should be required, but IMO it's OK to
> just hand wave this one away -- if the "zero a cache block" instruction
> doesn't make "zero a page" go faster then something has gone so far off the
> rails it's probably better to just pretend the machine doesn't implement
> Zicboz.
>
> This all LGTM, so unless anyone's opposed or it blows up on testing
> overnight then it'll be on for-next.

Thanks, Palmer!

drew