linux-kernel - Re: [RFC 08/16] vfio/type1: Cache locked_vm to ease mmap

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Date:   Thu, 6 Jan 2022 22:06:42 -0500
From:   Daniel Jordan <daniel.m.jordan@...cle.com>
To:     Jason Gunthorpe <jgg@...dia.com>
Cc:     Alex Williamson <alex.williamson@...hat.com>,
        Alexander Duyck <alexanderduyck@...com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ben Segall <bsegall@...gle.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Ingo Molnar <mingo@...hat.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Josh Triplett <josh@...htriplett.org>,
        Michal Hocko <mhocko@...e.com>, Nico Pache <npache@...hat.com>,
        Pasha Tatashin <pasha.tatashin@...een.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Steve Sistare <steven.sistare@...cle.com>,
        Tejun Heo <tj@...nel.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        linux-mm@...ck.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org
Subject: Re: [RFC 08/16] vfio/type1: Cache locked_vm to ease mmap_lock
 contention

On Thu, Jan 06, 2022 at 08:19:45PM -0400, Jason Gunthorpe wrote:
> On Thu, Jan 06, 2022 at 02:05:27PM -0700, Alex Williamson wrote:
> > > > Yeah, good question.  I tried doing it that way recently and it did
> > > > improve performance a bit, but I thought it wasn't enough of a gain to
> > > > justify how it overaccounted by the size of the entire pin.  
> > > 
> > > Why would it over account?
> > 
> > We'd be guessing that the entire virtual address mapping counts against
> > locked memory limits, but it might include PFNMAP pages or pages that
> > are already account via the page pinning interface that mdev devices
> > use.  At that point we're risking that the user isn't concurrently
> > doing something else that could fail as a result of pre-accounting and
> > fixup later schemes like this.  Thanks,

Yes, that's exactly what I was thinking.

> At least in iommufd I'm planning to keep the P2P ranges seperated from
> the normal page ranges. For user space compat we'd have to scan over
> the VA range looking for special VMAs. I expect in most cases there
> are few VMAs..
> 
> Computing the # pages pinned by mdevs requires a interval tree scan,
> in Daniel's target scenario the intervals will be empty so this costs
> nothing.
> 
> At least it seems like it is not an insurmountable problem if it makes
> an appreciable difference..

Ok, I can think more about this.

> After seeing Daniels's patches I've been wondering if the pin step in
> iommufd's draft could be parallized on a per-map basis without too
> much trouble. It might give Daniel a way to do a quick approach
> comparison..

Sorry, comparison between what?  I can take a look at iommufd tomorrow
though and see if your comment makes more sense.