From: Matthew Wilcox <willy@infradead.org> To: Alex Sierra <alex.sierra@amd.com> Cc: jgg@nvidia.com, david@redhat.com, Felix.Kuehling@amd.com, linux-mm@kvack.org, rcampbell@nvidia.com, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, hch@lst.de, jglisse@redhat.com, apopple@nvidia.com, akpm@linux-foundation.org Subject: Re: [PATCH v1 1/3] mm: split vm_normal_pages for LRU and non-LRU handling Date: Thu, 10 Mar 2022 19:25:30 +0000 [thread overview] Message-ID: <YipQqqpTz8hZAbLZ@casper.infradead.org> (raw) In-Reply-To: <20220310172633.9151-2-alex.sierra@amd.com> On Thu, Mar 10, 2022 at 11:26:31AM -0600, Alex Sierra wrote: > @@ -606,7 +606,7 @@ static void print_bad_pte(struct vm_area_struct *vma, unsigned long addr, > * PFNMAP mappings in order to support COWable mappings. > * > */ > -struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, > +struct page *vm_normal_any_page(struct vm_area_struct *vma, unsigned long addr, > pte_t pte) > { > unsigned long pfn = pte_pfn(pte); > @@ -620,8 +620,6 @@ struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, > return NULL; > if (is_zero_pfn(pfn)) > return NULL; > - if (pte_devmap(pte)) > - return NULL; > > print_bad_pte(vma, addr, pte, NULL); > return NULL; ... what? Haven't you just made it so that a devmap page always prints a bad PTE message, and then returns NULL anyway? Surely this should be: if (pte_devmap(pte)) - return NULL; + return pfn_to_page(pfn); or maybe + goto check_pfn; But I don't know about that highest_memmap_pfn check. > @@ -661,6 +659,22 @@ struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, > return pfn_to_page(pfn); > } > > +/* > + * vm_normal_lru_page -- This function gets the "struct page" associated > + * with a pte only for page cache and anon page. These pages are LRU handled. > + */ > +struct page *vm_normal_lru_page(struct vm_area_struct *vma, unsigned long addr, > + pte_t pte) It seems a shame to add a new function without proper kernel-doc.
WARNING: multiple messages have this Message-ID (diff)
From: Matthew Wilcox <willy@infradead.org> To: Alex Sierra <alex.sierra@amd.com> Cc: rcampbell@nvidia.com, david@redhat.com, Felix.Kuehling@amd.com, apopple@nvidia.com, amd-gfx@lists.freedesktop.org, linux-xfs@vger.kernel.org, linux-mm@kvack.org, jglisse@redhat.com, dri-devel@lists.freedesktop.org, jgg@nvidia.com, akpm@linux-foundation.org, linux-ext4@vger.kernel.org, hch@lst.de Subject: Re: [PATCH v1 1/3] mm: split vm_normal_pages for LRU and non-LRU handling Date: Thu, 10 Mar 2022 19:25:30 +0000 [thread overview] Message-ID: <YipQqqpTz8hZAbLZ@casper.infradead.org> (raw) In-Reply-To: <20220310172633.9151-2-alex.sierra@amd.com> On Thu, Mar 10, 2022 at 11:26:31AM -0600, Alex Sierra wrote: > @@ -606,7 +606,7 @@ static void print_bad_pte(struct vm_area_struct *vma, unsigned long addr, > * PFNMAP mappings in order to support COWable mappings. > * > */ > -struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, > +struct page *vm_normal_any_page(struct vm_area_struct *vma, unsigned long addr, > pte_t pte) > { > unsigned long pfn = pte_pfn(pte); > @@ -620,8 +620,6 @@ struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, > return NULL; > if (is_zero_pfn(pfn)) > return NULL; > - if (pte_devmap(pte)) > - return NULL; > > print_bad_pte(vma, addr, pte, NULL); > return NULL; ... what? Haven't you just made it so that a devmap page always prints a bad PTE message, and then returns NULL anyway? Surely this should be: if (pte_devmap(pte)) - return NULL; + return pfn_to_page(pfn); or maybe + goto check_pfn; But I don't know about that highest_memmap_pfn check. > @@ -661,6 +659,22 @@ struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, > return pfn_to_page(pfn); > } > > +/* > + * vm_normal_lru_page -- This function gets the "struct page" associated > + * with a pte only for page cache and anon page. These pages are LRU handled. > + */ > +struct page *vm_normal_lru_page(struct vm_area_struct *vma, unsigned long addr, > + pte_t pte) It seems a shame to add a new function without proper kernel-doc.
next prev parent reply other threads:[~2022-03-10 19:25 UTC|newest] Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-03-10 17:26 [PATCH v1 0/3] split vm_normal_pages for LRU and non-LRU handling Alex Sierra 2022-03-10 17:26 ` Alex Sierra 2022-03-10 17:26 ` [PATCH v1 1/3] mm: " Alex Sierra 2022-03-10 17:26 ` Alex Sierra 2022-03-10 19:25 ` Matthew Wilcox [this message] 2022-03-10 19:25 ` Matthew Wilcox 2022-03-10 21:58 ` Felix Kuehling 2022-03-10 21:58 ` Felix Kuehling 2022-03-17 2:50 ` Alistair Popple 2022-03-17 2:50 ` Alistair Popple 2022-03-11 9:16 ` David Hildenbrand 2022-03-11 9:16 ` David Hildenbrand 2022-03-11 17:08 ` Felix Kuehling 2022-03-11 17:08 ` Felix Kuehling 2022-03-17 2:54 ` Alistair Popple 2022-03-17 2:54 ` Alistair Popple 2022-03-17 8:13 ` David Hildenbrand 2022-03-17 8:13 ` David Hildenbrand 2022-03-17 13:25 ` Jason Gunthorpe 2022-03-17 13:25 ` Jason Gunthorpe 2022-03-10 17:26 ` [PATCH v1 2/3] tools: add more gup configs to hmm_gup selftests Alex Sierra 2022-03-10 17:26 ` Alex Sierra 2022-03-10 17:26 ` [PATCH v1 3/3] tools: add selftests to hmm for COW in device memory Alex Sierra 2022-03-10 17:26 ` Alex Sierra
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