From: Jerome Glisse <jglisse@redhat.com>
To: John Hubbard <jhubbard@nvidia.com>
Cc: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org,
Evgeny Baskakov <ebaskakov@nvidia.com>,
Ralph Campbell <rcampbell@nvidia.com>,
Mark Hairgrove <mhairgrove@nvidia.com>
Subject: Re: [PATCH 13/15] mm/hmm: factor out pte and pmd handling to simplify hmm_vma_walk_pmd()
Date: Wed, 21 Mar 2018 11:08:19 -0400 [thread overview]
Message-ID: <20180321150819.GC3214@redhat.com> (raw)
In-Reply-To: <e0fd4348-8b8c-90b2-a9d8-91a30768fddc@nvidia.com>
On Tue, Mar 20, 2018 at 10:07:29PM -0700, John Hubbard wrote:
> On 03/19/2018 07:00 PM, jglisse@redhat.com wrote:
> > From: Jerome Glisse <jglisse@redhat.com>
> >
> > No functional change, just create one function to handle pmd and one
> > to handle pte (hmm_vma_handle_pmd() and hmm_vma_handle_pte()).
> >
> > Signed-off-by: Jerome Glisse <jglisse@redhat.com>
> > Cc: Evgeny Baskakov <ebaskakov@nvidia.com>
> > Cc: Ralph Campbell <rcampbell@nvidia.com>
> > Cc: Mark Hairgrove <mhairgrove@nvidia.com>
> > Cc: John Hubbard <jhubbard@nvidia.com>
> > ---
> > mm/hmm.c | 174 +++++++++++++++++++++++++++++++++++++--------------------------
> > 1 file changed, 102 insertions(+), 72 deletions(-)
> >
> > diff --git a/mm/hmm.c b/mm/hmm.c
> > index 52cdceb35733..dc703e9c3a95 100644
> > --- a/mm/hmm.c
> > +++ b/mm/hmm.c
> > @@ -351,6 +351,99 @@ static int hmm_vma_walk_hole(unsigned long addr,
> > return hmm_vma_walk->fault ? -EAGAIN : 0;
> > }
> >
> > +static int hmm_vma_handle_pmd(struct mm_walk *walk,
> > + unsigned long addr,
> > + unsigned long end,
> > + uint64_t *pfns,
>
> Hi Jerome,
>
> Nice cleanup, it makes it much easier to follow the code now.
>
> Let's please rename the pfns argument above to "pfn", because in this
> helper (and the _pte helper too), there is only one pfn involved, rather
> than an array of them.
This is only true to handle_pte, for handle_pmd it will go over several
pfn entries. But they will all get fill with same value modulo pfn which
will increase monotically (ie same flag as pmd permissions apply to all
entries).
Note sure s/pfns/pfn for hmm_vma_handle_pte() warrant a respin.
Cheers,
Jerome
next prev parent reply other threads:[~2018-03-21 15:08 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-20 2:00 [PATCH 00/15] hmm: fixes and documentations v3 jglisse
2018-03-20 2:00 ` [PATCH 01/15] mm/hmm: documentation editorial update to HMM documentation jglisse
2018-03-20 2:00 ` [PATCH 02/15] mm/hmm: fix header file if/else/endif maze v2 jglisse
2018-03-20 2:00 ` [PATCH 03/15] mm/hmm: HMM should have a callback before MM is destroyed v2 jglisse
2018-03-21 4:14 ` John Hubbard
2018-03-21 18:03 ` Jerome Glisse
2018-03-21 22:16 ` John Hubbard
2018-03-21 22:46 ` Jerome Glisse
2018-03-21 23:10 ` John Hubbard
2018-03-21 23:37 ` Jerome Glisse
2018-03-22 0:11 ` John Hubbard
2018-03-22 1:32 ` Jerome Glisse
2018-03-22 1:28 ` [PATCH 03/15] mm/hmm: HMM should have a callback before MM is destroyed v3 jglisse
2018-03-22 6:58 ` John Hubbard
2018-03-20 2:00 ` [PATCH 04/15] mm/hmm: unregister mmu_notifier when last HMM client quit jglisse
2018-03-21 4:24 ` John Hubbard
2018-03-21 18:12 ` Jerome Glisse
2018-03-21 18:16 ` [PATCH 04/15] mm/hmm: unregister mmu_notifier when last HMM client quit v2 jglisse
2018-03-21 23:22 ` John Hubbard
2018-03-21 23:41 ` Jerome Glisse
2018-03-22 22:47 ` John Hubbard
2018-03-22 23:37 ` Jerome Glisse
2018-03-23 0:13 ` John Hubbard
2018-03-23 0:50 ` Jerome Glisse
2018-03-23 0:56 ` John Hubbard
2018-03-22 1:30 ` [PATCH 04/15] mm/hmm: unregister mmu_notifier when last HMM client quit v3 jglisse
2018-03-22 22:36 ` Andrew Morton
2018-03-20 2:00 ` [PATCH 05/15] mm/hmm: hmm_pfns_bad() was accessing wrong struct jglisse
2018-03-20 2:00 ` [PATCH 06/15] mm/hmm: use struct for hmm_vma_fault(), hmm_vma_get_pfns() parameters v2 jglisse
2018-03-20 2:00 ` [PATCH 07/15] mm/hmm: remove HMM_PFN_READ flag and ignore peculiar architecture v2 jglisse
2018-03-20 2:00 ` [PATCH 08/15] mm/hmm: use uint64_t for HMM pfn instead of defining hmm_pfn_t to ulong v2 jglisse
2018-03-20 2:00 ` [PATCH 09/15] mm/hmm: cleanup special vma handling (VM_SPECIAL) jglisse
2018-03-20 2:00 ` [PATCH 10/15] mm/hmm: do not differentiate between empty entry or missing directory v2 jglisse
2018-03-21 5:24 ` John Hubbard
2018-03-21 14:48 ` Jerome Glisse
2018-03-21 23:16 ` John Hubbard
2018-03-20 2:00 ` [PATCH 11/15] mm/hmm: rename HMM_PFN_DEVICE_UNADDRESSABLE to HMM_PFN_DEVICE_PRIVATE jglisse
2018-03-20 2:00 ` [PATCH 12/15] mm/hmm: move hmm_pfns_clear() closer to where it is use jglisse
2018-03-20 2:00 ` [PATCH 13/15] mm/hmm: factor out pte and pmd handling to simplify hmm_vma_walk_pmd() jglisse
2018-03-21 5:07 ` John Hubbard
2018-03-21 15:08 ` Jerome Glisse [this message]
2018-03-21 22:36 ` John Hubbard
2018-03-20 2:00 ` [PATCH 14/15] mm/hmm: change hmm_vma_fault() to allow write fault on page basis jglisse
2018-03-20 2:00 ` [PATCH 15/15] mm/hmm: use device driver encoding for HMM pfn v2 jglisse
2018-03-21 4:39 ` John Hubbard
2018-03-21 15:52 ` Jerome Glisse
2018-03-21 23:19 ` John Hubbard
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