On Wed, Jan 31, 2024 at 8:30 AM Adhemerval Zanella Netto <
adhemerval.zanella@linaro.org> wrote:

>
>
> On 31/01/24 04:54, Florian Weimer wrote:
> > * Cristian Rodríguez:
> >
> >> On Tue, May 23, 2023 at 5:48 AM Wilco Dijkstra via Libc-alpha <
> libc-alpha@sourceware.org>
> >> wrote:
> >>
> >>> However even switching off THP for all small stacks (eg. default size
> or smaller)
> >>> would avoid the random use of THP without needing to set the tunable.
> >>>
> >>> Cheers,
> >>> Wilco
> >>
> >>
> >> Didn't found the exact message to reply.. but this one is close enough.
> MAP_STACK implies no
> >> transparent hugepages since linux kernel commit
> >>
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c4608d1bf7c6536d1a3d233eb21e50678681564e
> >
> > It's an odd choice for fixing the regression.  I commented on the
> > linux-mm thread.  It's also surprising to see such changes being made
> > without larger discussion.
>
> Do you have a link for this discussion?
>

Doesn't this also imply that  the kernel expects the MAP_GROWSDOWN flag
#if _STACK_GROWS_DOWN to do the right thing elsewhere ?