From: Shakeel Butt <shakeelb@google.com>
To: Liam Howlett <liam.howlett@oracle.com>
Cc: Alistair Popple <apopple@nvidia.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
"nouveau@lists.freedesktop.org" <nouveau@lists.freedesktop.org>,
"bskeggs@redhat.com" <bskeggs@redhat.com>,
"rcampbell@nvidia.com" <rcampbell@nvidia.com>,
"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
"jhubbard@nvidia.com" <jhubbard@nvidia.com>,
"bsingharora@gmail.com" <bsingharora@gmail.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"dri-devel@lists.freedesktop.org"
<dri-devel@lists.freedesktop.org>,
"hch@infradead.org" <hch@infradead.org>,
"jglisse@redhat.com" <jglisse@redhat.com>,
"willy@infradead.org" <willy@infradead.org>,
"jgg@nvidia.com" <jgg@nvidia.com>,
"peterx@redhat.com" <peterx@redhat.com>,
"hughd@google.com" <hughd@google.com>,
Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v9 03/10] mm/rmap: Split try_to_munlock from try_to_unmap
Date: Tue, 25 May 2021 16:45:28 -0700 [thread overview]
Message-ID: <CALvZod5T1yjOk48Q_efppvP6iQWnSUwdOQL=G9TadrB6nS-s4Q@mail.gmail.com> (raw)
In-Reply-To: <20210525183710.fa2m2sbfixnhz7g5@revolver>
On Tue, May 25, 2021 at 11:40 AM Liam Howlett <liam.howlett@oracle.com> wrote:
>
[...]
> >
> > +/*
> > + * Walks the vma's mapping a page and mlocks the page if any locked vma's are
> > + * found. Once one is found the page is locked and the scan can be terminated.
> > + */
>
> Can you please add that this requires the mmap_sem() lock to the
> comments?
>
Why does this require mmap_sem() lock? Also mmap_sem() lock of which mm_struct?
> > +static bool page_mlock_one(struct page *page, struct vm_area_struct *vma,
> > + unsigned long address, void *unused)
> > +{
> > + struct page_vma_mapped_walk pvmw = {
> > + .page = page,
> > + .vma = vma,
> > + .address = address,
> > + };
> > +
> > + /* An un-locked vma doesn't have any pages to lock, continue the scan */
> > + if (!(vma->vm_flags & VM_LOCKED))
> > + return true;
> > +
> > + while (page_vma_mapped_walk(&pvmw)) {
> > + /* PTE-mapped THP are never mlocked */
> > + if (!PageTransCompound(page))
> > + mlock_vma_page(page);
> > + page_vma_mapped_walk_done(&pvmw);
> > +
> > + /*
> > + * no need to continue scanning other vma's if the page has
> > + * been locked.
> > + */
> > + return false;
> > + }
> > +
> > + return true;
> > +}
next prev parent reply other threads:[~2021-05-25 23:45 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-24 13:27 [PATCH v9 00/10] Add support for SVM atomics in Nouveau Alistair Popple
2021-05-24 13:27 ` [PATCH v9 01/10] mm: Remove special swap entry functions Alistair Popple
2021-05-24 13:27 ` [PATCH v9 02/10] mm/swapops: Rework swap entry manipulation code Alistair Popple
2021-05-24 13:27 ` [PATCH v9 03/10] mm/rmap: Split try_to_munlock from try_to_unmap Alistair Popple
2021-05-25 18:39 ` Liam Howlett
2021-05-25 23:45 ` Shakeel Butt [this message]
2021-06-04 20:49 ` Liam Howlett
2021-06-05 0:41 ` Shakeel Butt
2021-06-05 3:39 ` Liam Howlett
2021-06-05 4:19 ` Shakeel Butt
2021-06-07 4:51 ` Alistair Popple
2021-05-24 13:27 ` [PATCH v9 04/10] mm/rmap: Split migration into its own function Alistair Popple
2021-05-24 13:27 ` [PATCH v9 05/10] mm: Rename migrate_pgmap_owner Alistair Popple
2021-05-26 19:41 ` Peter Xu
2021-05-24 13:27 ` [PATCH v9 06/10] mm/memory.c: Allow different return codes for copy_nonpresent_pte() Alistair Popple
2021-05-26 19:50 ` Peter Xu
2021-05-27 1:20 ` Alistair Popple
2021-05-27 1:44 ` Peter Xu
2021-05-24 13:27 ` [PATCH v9 07/10] mm: Device exclusive memory access Alistair Popple
2021-05-24 22:11 ` Andrew Morton
2021-05-25 1:31 ` John Hubbard
2021-05-25 9:21 ` Alistair Popple
2021-05-25 11:51 ` Balbir Singh
2021-05-26 7:17 ` John Hubbard
2021-05-26 13:30 ` Alistair Popple
2021-06-02 8:50 ` Balbir Singh
2021-06-02 14:37 ` Peter Xu
2021-06-03 11:39 ` Alistair Popple
2021-06-03 14:47 ` Peter Xu
2021-06-04 1:07 ` Alistair Popple
2021-06-04 15:20 ` Peter Xu
2021-06-03 8:37 ` John Hubbard
2021-05-26 19:28 ` Peter Xu
2021-05-27 3:35 ` Alistair Popple
2021-05-27 13:04 ` Peter Xu
2021-05-28 1:48 ` Alistair Popple
2021-05-28 13:11 ` Peter Xu
2021-05-24 13:27 ` [PATCH v9 08/10] mm: Selftests for exclusive device memory Alistair Popple
2021-05-24 13:27 ` [PATCH v9 09/10] nouveau/svm: Refactor nouveau_range_fault Alistair Popple
2021-05-24 13:27 ` [PATCH v9 10/10] nouveau/svm: Implement atomic SVM access Alistair Popple
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