Re: [RFC PATCH 0/2] remove SWAP_MAP_SHMEM

[Barry Song]

On Wed, Sep 25, 2024 at 3:28 PM Huang, Ying <ying.huang@xxxxxxxxx> wrote:
>
> Barry Song <21cnbao@xxxxxxxxx> writes:
>
> [snip]
>
> > I am perfectly fine with the approach, in the first loop, if we find all entries
> > don't need CONTINUED, we can run the 2nd loop even for usage==1
> > and nr > 1. this is almost always true for a real product where anon folios
> > are unlikely to be fork-shared by so many processes.
>
> One possible use case is ksm.  Where the map count could be large.

Sorry, I overlooked the KSM case, but it seems this doesn't significantly
change the overall direction. :-)

Since we can fall back to swap_duplicate() and handle each entry one
by one after the first loopback returns -ENOMEM, KSM isn't a concern
either.

>
> --
> Best Regards,
> Huang, Ying

Thanks
Barry