From: Jason Gunthorpe <jgg@nvidia.com>
To: Alistair Popple <apopple@nvidia.com>
Cc: rcampbell@nvidia.com, willy@infradead.org,
linux-doc@vger.kernel.org, nouveau@lists.freedesktop.org,
dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
kvm-ppc@vger.kernel.org, hch@infradead.org, linux-mm@kvack.org,
bskeggs@redhat.com, daniel@ffwll.ch, akpm@linux-foundation.org,
Christoph Hellwig <hch@lst.de>
Subject: Re: [Nouveau] [PATCH v7 3/8] mm/rmap: Split try_to_munlock from try_to_unmap
Date: Tue, 30 Mar 2021 15:49:03 -0300 [thread overview]
Message-ID: <20210330184903.GZ2356281@nvidia.com> (raw)
In-Reply-To: <20210326000805.2518-4-apopple@nvidia.com>
On Fri, Mar 26, 2021 at 11:08:00AM +1100, Alistair Popple wrote:
> +static bool try_to_munlock_one(struct page *page, struct vm_area_struct *vma,
> + unsigned long address, void *arg)
> +{
Is this function name right?
> + struct page_vma_mapped_walk pvmw = {
> + .page = page,
> + .vma = vma,
> + .address = address,
> + };
> +
> + /* munlock has nothing to gain from examining un-locked vmas */
> + if (!(vma->vm_flags & VM_LOCKED))
> + return true;
> +
> + while (page_vma_mapped_walk(&pvmw)) {
> + /* PTE-mapped THP are never mlocked */
> + if (!PageTransCompound(page)) {
> + /*
> + * Holding pte lock, we do *not* need
> + * mmap_lock here
> + */
> + mlock_vma_page(page);
Because the only action this function seems to take is to call
*mlock*_vma_page()
> + }
> + page_vma_mapped_walk_done(&pvmw);
> +
> + /* found a mlocked page, no point continuing munlock check */
> + return false;
> + }
> +
> + return true;
> +}
> +
> /**
> * try_to_munlock - try to munlock a page
> * @page: the page to be munlocked
> @@ -1796,8 +1821,7 @@ bool try_to_unmap(struct page *page, enum ttu_flags flags)
> void try_to_munlock(struct page *page)
> {
But this is also called try_to_munlock ??
/**
* try_to_munlock - try to munlock a page
* @page: the page to be munlocked
*
* Called from munlock code. Checks all of the VMAs mapping the page
* to make sure nobody else has this page mlocked. The page will be
* returned with PG_mlocked cleared if no other vmas have it mlocked.
*/
So what clears PG_mlocked on this call path?
Something needs attention here..
Jason
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next prev parent reply other threads:[~2021-03-30 18:49 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-26 0:07 [Nouveau] [PATCH v7 0/8] Add support for SVM atomics in Nouveau Alistair Popple
2021-03-26 0:07 ` [Nouveau] [PATCH v7 1/8] mm: Remove special swap entry functions Alistair Popple
2021-03-30 18:38 ` Jason Gunthorpe
2021-03-26 0:07 ` [Nouveau] [PATCH v7 2/8] mm/swapops: Rework swap entry manipulation code Alistair Popple
2021-03-26 0:08 ` [Nouveau] [PATCH v7 3/8] mm/rmap: Split try_to_munlock from try_to_unmap Alistair Popple
2021-03-30 18:49 ` Jason Gunthorpe [this message]
2021-03-30 22:09 ` Alistair Popple
2021-03-30 22:16 ` Alistair Popple
2021-03-30 22:24 ` Jason Gunthorpe
2021-03-30 22:43 ` John Hubbard
2021-03-30 22:56 ` Alistair Popple
2021-03-31 3:56 ` John Hubbard
2021-03-31 4:09 ` John Hubbard
2021-03-31 4:15 ` Alistair Popple
2021-03-31 11:57 ` Jason Gunthorpe
2021-04-01 4:36 ` Alistair Popple
2021-04-01 19:21 ` Shakeel Butt
2021-03-26 0:08 ` [Nouveau] [PATCH v7 4/8] mm/rmap: Split migration into its own function Alistair Popple
2021-03-26 0:08 ` [Nouveau] [PATCH v7 5/8] mm: Device exclusive memory access Alistair Popple
2021-03-30 19:32 ` Jason Gunthorpe
2021-03-31 12:59 ` Alistair Popple
2021-03-31 13:18 ` Jason Gunthorpe
2021-03-31 13:27 ` Alistair Popple
2021-03-31 13:46 ` Jason Gunthorpe
2021-04-01 0:45 ` Alistair Popple
2021-04-01 0:48 ` Jason Gunthorpe
2021-04-01 2:20 ` Alistair Popple
2021-04-01 11:55 ` Jason Gunthorpe
2021-03-26 0:08 ` [Nouveau] [PATCH v7 6/8] mm: Selftests for exclusive device memory Alistair Popple
2021-03-26 0:08 ` [Nouveau] [PATCH v7 7/8] nouveau/svm: Refactor nouveau_range_fault Alistair Popple
2021-03-26 0:08 ` [Nouveau] [PATCH v7 8/8] nouveau/svm: Implement atomic SVM access Alistair Popple
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