linux-kernel - Re: [PATCH 0/5] use pinned_vm instead of locked

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Message-ID: <20190211225447.GN24692@ziepe.ca>
Date:   Mon, 11 Feb 2019 15:54:47 -0700
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Daniel Jordan <daniel.m.jordan@...cle.com>
Cc:     akpm@...ux-foundation.org, dave@...olabs.net, jack@...e.cz,
        cl@...ux.com, linux-mm@...ck.org, kvm@...r.kernel.org,
        kvm-ppc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-fpga@...r.kernel.org, linux-kernel@...r.kernel.org,
        alex.williamson@...hat.com, paulus@...abs.org,
        benh@...nel.crashing.org, mpe@...erman.id.au, hao.wu@...el.com,
        atull@...nel.org, mdf@...nel.org, aik@...abs.ru
Subject: Re: [PATCH 0/5] use pinned_vm instead of locked_vm to account pinned
 pages

On Mon, Feb 11, 2019 at 05:44:32PM -0500, Daniel Jordan wrote:
> Hi,
> 
> This series converts users that account pinned pages with locked_vm to
> account with pinned_vm instead, pinned_vm being the correct counter to
> use.  It's based on a similar patch I posted recently[0].
> 
> The patches are based on rdma/for-next to build on Davidlohr Bueso's
> recent conversion of pinned_vm to an atomic64_t[1].  Seems to make some
> sense for these to be routed the same way, despite lack of rdma content?

Oy.. I'd be willing to accumulate a branch with acks to send to Linus
*separately* from RDMA to Linus, but this is very abnormal.

Better to wait a few weeks for -rc1 and send patches through the
subsystem trees.

> All five of these places, and probably some of Davidlohr's conversions,
> probably want to be collapsed into a common helper in the core mm for
> accounting pinned pages.  I tried, and there are several details that
> likely need discussion, so this can be done as a follow-on.

I've wondered the same..

Jason