Re: [RESEND PATCH V4] pidns: introduce syscall translate_pid

[Nagarathnam Muthusamy]

On 04/03/2018 02:52 PM, Andrew Morton wrote:
> On Tue, 3 Apr 2018 14:45:28 -0700 Nagarathnam Muthusamy <nagarathnam.muthusamy@xxxxxxxxxx> wrote:
>
> > > This changelog doesn't explain what the value is to our users.  I
> > > assume it is a performance optimization because "backward translation
> > > requires scanning all tasks"?  If so, please show us real-world
> > > examples of the performance benefit from this patch, and please go to
> > > great lengths to explain to us why this optimisation is needed by our
> > > users.
> > One of the usecase by Oracle database involves multiple levels of
> > nested pid namespaces and we require pid translation between the
> > levels. Discussions on the particular usecase, why any of the existing
> > methods was not usable happened in the following thread.
> >
> > https://patchwork.kernel.org/patch/10276785/
> >
> > At the end, it was agreed that this patch along with flocks will solve the
> > issue.
> Nobody who reads this patch's changelog will know any of this.  Please
> let's get all this information into the proper place.
Sure! Will resend the patch with updated change log.

Thanks,
Nagarathnam.
>