Hello,
Thank you for the suggestions on this.
>
> > On Thu 11-04-19 07:51:48, Dan Williams wrote:
> >> On Tue, Apr 9, 2019 at 9:09 PM Pankaj Gupta <pagupta@xxxxxxxxxx> wrote:
> >> > + } else {
> >> > + if (nd_region->flush(nd_region))
> >> > + rc = -EIO;
> >>
> >> Given the common case wants to be fast and synchronous I think we
> >> should try to avoid retpoline overhead by default. So something like
> >> this:
> >>
> >> if (nd_region->flush == generic_nvdimm_flush)
> >> rc = generic_nvdimm_flush(...);
> >
> > I'd either add a comment about avoiding retpoline overhead here or just
> > make ->flush == NULL mean generic_nvdimm_flush(). Just so that people don't
> > get confused by the code.
>
> Isn't this premature optimization? I really don't like adding things
> like this without some numbers to show it's worth it.
Can we add the optimization after this version is merged.
Best regards,
Pankaj
>
> -Jeff
>
>
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