linux-kernel - Re: [PATCH v4 2/2] mm/hmm/test: add self tests for HMM

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Date:   Tue, 12 Nov 2019 23:45:52 +0000
From:   Jason Gunthorpe <jgg@...lanox.com>
To:     Ralph Campbell <rcampbell@...dia.com>
CC:     Christoph Hellwig <hch@....de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jerome Glisse <jglisse@...hat.com>,
        John Hubbard <jhubbard@...dia.com>,
        Shuah Khan <shuah@...nel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH v4 2/2] mm/hmm/test: add self tests for HMM

On Tue, Nov 12, 2019 at 01:51:11PM -0800, Ralph Campbell wrote:

> > > +static int dmirror_invalidate_range_start(struct mmu_notifier *mn,
> > > +				const struct mmu_notifier_range *update)
> > > +{
> > > +	struct dmirror *dmirror = container_of(mn, struct dmirror, notifier);
> > > +
> > > +	if (mmu_notifier_range_blockable(update))
> > > +		mutex_lock(&dmirror->mutex);
> > > +	else if (!mutex_trylock(&dmirror->mutex))
> > > +		return -EAGAIN;
> > > +
> > > +	dmirror_do_update(dmirror, update->start, update->end);
> > > +	mutex_unlock(&dmirror->mutex);
> > > +	return 0;
> > > +}
> > 
> > Can we adopts this to Jasons new interval tree invalidate?
> 
> Well, it would mean registering for the whole process address space.
> I'll give it a try.

I'm not sure it makes much sense that this testing is essentially
modeled after nouveau's usage which is very strange compared to the
other drivers.

Jason