From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mike Rapoport Subject: Re: [PATCH 9/8] mm: Account PMD tables like PTE tables Date: Sun, 28 Jun 2020 09:59:51 +0300 Message-ID: <20200628065951.GB576120@kernel.org> References: <20200627143453.31835-1-rppt@kernel.org> <20200627184642.GF25039@casper.infradead.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20200627184642.GF25039@casper.infradead.org> Sender: linux-ia64-owner@vger.kernel.org To: Matthew Wilcox Cc: linux-kernel@vger.kernel.org, Abdul Haleem , Andrew Morton , Andy Lutomirski , Arnd Bergmann , Christophe Leroy , Joerg Roedel , Max Filippov , Mike Rapoport , Peter Zijlstra , Satheesh Rajendran , Stafford Horne , Stephen Rothwell , Steven Rostedt , linux-alpha@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mi List-Id: linux-arch.vger.kernel.org On Sat, Jun 27, 2020 at 07:46:42PM +0100, Matthew Wilcox wrote: > We account the PTE level of the page tables to the process in order to > make smarter OOM decisions and help diagnose why memory is fragmented. > For these same reasons, we should account pages allocated for PMDs. > With larger process address spaces and ASLR, the number of PMDs in use > is higher than it used to be so the inaccuracy is starting to matter. > > Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Mike Rapoport > --- > include/linux/mm.h | 24 ++++++++++++++++++++---- > 1 file changed, 20 insertions(+), 4 deletions(-) > > diff --git a/include/linux/mm.h b/include/linux/mm.h > index dc7b87310c10..b283e25fcffa 100644 > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -2271,7 +2271,7 @@ static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) > return ptlock_ptr(pmd_to_page(pmd)); > } > > -static inline bool pgtable_pmd_page_ctor(struct page *page) > +static inline bool pmd_ptlock_init(struct page *page) > { > #ifdef CONFIG_TRANSPARENT_HUGEPAGE > page->pmd_huge_pte = NULL; > @@ -2279,7 +2279,7 @@ static inline bool pgtable_pmd_page_ctor(struct page *page) > return ptlock_init(page); > } > > -static inline void pgtable_pmd_page_dtor(struct page *page) > +static inline void pmd_ptlock_free(struct page *page) > { > #ifdef CONFIG_TRANSPARENT_HUGEPAGE > VM_BUG_ON_PAGE(page->pmd_huge_pte, page); > @@ -2296,8 +2296,8 @@ static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) > return &mm->page_table_lock; > } > > -static inline bool pgtable_pmd_page_ctor(struct page *page) { return true; } > -static inline void pgtable_pmd_page_dtor(struct page *page) {} > +static inline bool pmd_ptlock_init(struct page *page) { return true; } > +static inline void pmd_ptlock_free(struct page *page) {} > > #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte) > > @@ -2310,6 +2310,22 @@ static inline spinlock_t *pmd_lock(struct mm_struct *mm, pmd_t *pmd) > return ptl; > } > > +static inline bool pgtable_pmd_page_ctor(struct page *page) > +{ > + if (!pmd_ptlock_init(page)) > + return false; > + __SetPageTable(page); > + inc_zone_page_state(page, NR_PAGETABLE); > + return true; > +} > + > +static inline void pgtable_pmd_page_dtor(struct page *page) > +{ > + pmd_ptlock_free(page); > + __ClearPageTable(page); > + dec_zone_page_state(page, NR_PAGETABLE); > +} > + > /* > * No scalability reason to split PUD locks yet, but follow the same pattern > * as the PMD locks to make it easier if we decide to. The VM should not be > -- > 2.27.0 > -- Sincerely yours, Mike. From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Sun, 28 Jun 2020 09:59:51 +0300 From: Mike Rapoport Subject: Re: [PATCH 9/8] mm: Account PMD tables like PTE tables Message-ID: <20200628065951.GB576120@kernel.org> References: <20200627143453.31835-1-rppt@kernel.org> <20200627184642.GF25039@casper.infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200627184642.GF25039@casper.infradead.org> Sender: owner-linux-mm@kvack.org To: Matthew Wilcox Cc: linux-kernel@vger.kernel.org, Abdul Haleem , Andrew Morton , Andy Lutomirski , Arnd Bergmann , Christophe Leroy , Joerg Roedel , Max Filippov , Mike Rapoport , Peter Zijlstra , Satheesh Rajendran , Stafford Horne , Stephen Rothwell , Steven Rostedt , linux-alpha@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, linux-parisc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org, linuxppc-dev@lists.ozlabs.org, openrisc@lists.librecores.org, sparclinux@vger.kernel.org List-ID: Message-ID: <20200628065951.cx0aA1dloAbH4qtmY-XdHxmFFl4k7PetLJbBCPWtTdg@z> On Sat, Jun 27, 2020 at 07:46:42PM +0100, Matthew Wilcox wrote: > We account the PTE level of the page tables to the process in order to > make smarter OOM decisions and help diagnose why memory is fragmented. > For these same reasons, we should account pages allocated for PMDs. > With larger process address spaces and ASLR, the number of PMDs in use > is higher than it used to be so the inaccuracy is starting to matter. > > Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Mike Rapoport > --- > include/linux/mm.h | 24 ++++++++++++++++++++---- > 1 file changed, 20 insertions(+), 4 deletions(-) > > diff --git a/include/linux/mm.h b/include/linux/mm.h > index dc7b87310c10..b283e25fcffa 100644 > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -2271,7 +2271,7 @@ static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) > return ptlock_ptr(pmd_to_page(pmd)); > } > > -static inline bool pgtable_pmd_page_ctor(struct page *page) > +static inline bool pmd_ptlock_init(struct page *page) > { > #ifdef CONFIG_TRANSPARENT_HUGEPAGE > page->pmd_huge_pte = NULL; > @@ -2279,7 +2279,7 @@ static inline bool pgtable_pmd_page_ctor(struct page *page) > return ptlock_init(page); > } > > -static inline void pgtable_pmd_page_dtor(struct page *page) > +static inline void pmd_ptlock_free(struct page *page) > { > #ifdef CONFIG_TRANSPARENT_HUGEPAGE > VM_BUG_ON_PAGE(page->pmd_huge_pte, page); > @@ -2296,8 +2296,8 @@ static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) > return &mm->page_table_lock; > } > > -static inline bool pgtable_pmd_page_ctor(struct page *page) { return true; } > -static inline void pgtable_pmd_page_dtor(struct page *page) {} > +static inline bool pmd_ptlock_init(struct page *page) { return true; } > +static inline void pmd_ptlock_free(struct page *page) {} > > #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte) > > @@ -2310,6 +2310,22 @@ static inline spinlock_t *pmd_lock(struct mm_struct *mm, pmd_t *pmd) > return ptl; > } > > +static inline bool pgtable_pmd_page_ctor(struct page *page) > +{ > + if (!pmd_ptlock_init(page)) > + return false; > + __SetPageTable(page); > + inc_zone_page_state(page, NR_PAGETABLE); > + return true; > +} > + > +static inline void pgtable_pmd_page_dtor(struct page *page) > +{ > + pmd_ptlock_free(page); > + __ClearPageTable(page); > + dec_zone_page_state(page, NR_PAGETABLE); > +} > + > /* > * No scalability reason to split PUD locks yet, but follow the same pattern > * as the PMD locks to make it easier if we decide to. The VM should not be > -- > 2.27.0 > -- Sincerely yours, Mike.