Hi Oleksandr,
On Tue, Jun 23, 2020 at 11:07:21AM +0200, Oleksandr Natalenko wrote:
> On Mon, Jun 22, 2020 at 12:28:56PM -0700, Minchan Kim wrote:
> > Now, we have MADV_PAGEOUT and MADV_COLD as madvise hinting API. With that,
> > application could give hints to kernel what memory range are preferred to be
> > reclaimed. However, in some platform(e.g., Android), the information
> > required to make the hinting decision is not known to the app.
> > Instead, it is known to a centralized userspace daemon(e.g., ActivityManagerService),
> > and that daemon must be able to initiate reclaim on its own without any app
> > involvement.
> >
> > To solve the concern, this patch introduces new syscall - process_madvise(2).
> > Bascially, it's same with madvise(2) syscall but it has some differences.
> >
> > 1. It needs pidfd of target process to provide the hint
> > 2. It supports only MADV_{COLD|PAGEOUT} at this moment.
> > Other hints in madvise will be opened when there are explicit requests from
> > community to prevent unexpected bugs we couldn't support.
> > 3. Only privileged processes can do something for other process's address
> > space.
> >
> > For more detail of the new API, please see "mm: introduce external memory hinting API"
> > description in this patchset.
> >
> > * from v7 - http://lore.kernel.org/r/20200302193630.68771-1-minchan@xxxxxxxxxx
> > * dropping pid support from new syscall and fold releated patches into syscall patch
> > * dropping KSM patch by discussion - Oleksandr, I lost the discussion.
> > Please resend the single patch against of the patchset if you resolves the discussion.
> > https://lore.kernel.org/linux-api/20200302193630.68771-8-minchan@xxxxxxxxxx/
>
> What "next" tag this (v8) submission is based on please?
It's against on v5.8-rc1-mmots-2020-06-20-21-44 from mmotm - https://github.com/hnaz/linux-mm.git
