From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> To: Andrew Morton <akpm@linux-foundation.org>, Andrea Arcangeli <aarcange@redhat.com>, Hugh Dickins <hughd@google.com> Cc: Dave Hansen <dave.hansen@intel.com>, Mel Gorman <mgorman@suse.de>, Rik van Riel <riel@redhat.com>, Vlastimil Babka <vbabka@suse.cz>, Christoph Lameter <cl@gentwo.org>, Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>, Steve Capper <steve.capper@linaro.org>, "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>, Johannes Weiner <hannes@cmpxchg.org>, Michal Hocko <mhocko@suse.cz>, Jerome Marchand <jmarchan@redhat.com>, Sasha Levin <sasha.levin@oracle.com>, linux-kernel@vger.kernel.org, linux-mm@kvack.org, "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Subject: [PATCH 19/36] mips, thp: remove infrastructure for handling splitting PMDs Date: Fri, 10 Jul 2015 20:41:53 +0300 [thread overview] Message-ID: <1436550130-112636-20-git-send-email-kirill.shutemov@linux.intel.com> (raw) In-Reply-To: <1436550130-112636-1-git-send-email-kirill.shutemov@linux.intel.com> With new refcounting we don't need to mark PMDs splitting. Let's drop code to handle this. pmdp_splitting_flush() is not needed too: on splitting PMD we will do pmdp_clear_flush() + set_pte_at(). pmdp_clear_flush() will do IPI as needed for fast_gup. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> --- arch/mips/include/asm/pgtable-bits.h | 6 ++---- arch/mips/include/asm/pgtable.h | 18 ------------------ arch/mips/mm/gup.c | 13 +------------ arch/mips/mm/pgtable-64.c | 14 -------------- arch/mips/mm/tlbex.c | 1 - 5 files changed, 3 insertions(+), 49 deletions(-) diff --git a/arch/mips/include/asm/pgtable-bits.h b/arch/mips/include/asm/pgtable-bits.h index c28a8499aec7..9bf8b2b87364 100644 --- a/arch/mips/include/asm/pgtable-bits.h +++ b/arch/mips/include/asm/pgtable-bits.h @@ -131,14 +131,12 @@ /* Huge TLB page */ #define _PAGE_HUGE_SHIFT (_PAGE_MODIFIED_SHIFT + 1) #define _PAGE_HUGE (1 << _PAGE_HUGE_SHIFT) -#define _PAGE_SPLITTING_SHIFT (_PAGE_HUGE_SHIFT + 1) -#define _PAGE_SPLITTING (1 << _PAGE_SPLITTING_SHIFT) /* Only R2 or newer cores have the XI bit */ #if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6) -#define _PAGE_NO_EXEC_SHIFT (_PAGE_SPLITTING_SHIFT + 1) +#define _PAGE_NO_EXEC_SHIFT (_PAGE_HUGE_SHIFT + 1) #else -#define _PAGE_GLOBAL_SHIFT (_PAGE_SPLITTING_SHIFT + 1) +#define _PAGE_GLOBAL_SHIFT (_PAGE_HUGE_SHIFT + 1) #define _PAGE_GLOBAL (1 << _PAGE_GLOBAL_SHIFT) #endif /* CONFIG_CPU_MIPSR2 || CONFIG_CPU_MIPSR6 */ diff --git a/arch/mips/include/asm/pgtable.h b/arch/mips/include/asm/pgtable.h index 9d8106758142..556c02a0706a 100644 --- a/arch/mips/include/asm/pgtable.h +++ b/arch/mips/include/asm/pgtable.h @@ -449,27 +449,9 @@ static inline pmd_t pmd_mkhuge(pmd_t pmd) return pmd; } -static inline int pmd_trans_splitting(pmd_t pmd) -{ - return !!(pmd_val(pmd) & _PAGE_SPLITTING); -} - -static inline pmd_t pmd_mksplitting(pmd_t pmd) -{ - pmd_val(pmd) |= _PAGE_SPLITTING; - - return pmd; -} - extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, pmd_t pmd); -#define __HAVE_ARCH_PMDP_SPLITTING_FLUSH -/* Extern to avoid header file madness */ -extern void pmdp_splitting_flush(struct vm_area_struct *vma, - unsigned long address, - pmd_t *pmdp); - #define __HAVE_ARCH_PMD_WRITE static inline int pmd_write(pmd_t pmd) { diff --git a/arch/mips/mm/gup.c b/arch/mips/mm/gup.c index 36a35115dc2e..1afd87c999b0 100644 --- a/arch/mips/mm/gup.c +++ b/arch/mips/mm/gup.c @@ -107,18 +107,7 @@ static int gup_pmd_range(pud_t pud, unsigned long addr, unsigned long end, pmd_t pmd = *pmdp; next = pmd_addr_end(addr, end); - /* - * The pmd_trans_splitting() check below explains why - * pmdp_splitting_flush has to flush the tlb, to stop - * this gup-fast code from running while we set the - * splitting bit in the pmd. Returning zero will take - * the slow path that will call wait_split_huge_page() - * if the pmd is still in splitting state. gup-fast - * can't because it has irq disabled and - * wait_split_huge_page() would never return as the - * tlb flush IPI wouldn't run. - */ - if (pmd_none(pmd) || pmd_trans_splitting(pmd)) + if (pmd_none(pmd)) return 0; if (unlikely(pmd_huge(pmd))) { if (!gup_huge_pmd(pmd, addr, next, write, pages,nr)) diff --git a/arch/mips/mm/pgtable-64.c b/arch/mips/mm/pgtable-64.c index e8adc0069d66..ce4473e7c0d2 100644 --- a/arch/mips/mm/pgtable-64.c +++ b/arch/mips/mm/pgtable-64.c @@ -62,20 +62,6 @@ void pmd_init(unsigned long addr, unsigned long pagetable) } #endif -#ifdef CONFIG_TRANSPARENT_HUGEPAGE - -void pmdp_splitting_flush(struct vm_area_struct *vma, - unsigned long address, - pmd_t *pmdp) -{ - if (!pmd_trans_splitting(*pmdp)) { - pmd_t pmd = pmd_mksplitting(*pmdp); - set_pmd_at(vma->vm_mm, address, pmdp, pmd); - } -} - -#endif - pmd_t mk_pmd(struct page *page, pgprot_t prot) { pmd_t pmd; diff --git a/arch/mips/mm/tlbex.c b/arch/mips/mm/tlbex.c index 97c87027c17f..02b53ce7fc2e 100644 --- a/arch/mips/mm/tlbex.c +++ b/arch/mips/mm/tlbex.c @@ -240,7 +240,6 @@ static void output_pgtable_bits_defines(void) pr_define("_PAGE_MODIFIED_SHIFT %d\n", _PAGE_MODIFIED_SHIFT); #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT pr_define("_PAGE_HUGE_SHIFT %d\n", _PAGE_HUGE_SHIFT); - pr_define("_PAGE_SPLITTING_SHIFT %d\n", _PAGE_SPLITTING_SHIFT); #endif #ifdef CONFIG_CPU_MIPSR2 if (cpu_has_rixi) { -- 2.1.4
WARNING: multiple messages have this Message-ID (diff)
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> To: Andrew Morton <akpm@linux-foundation.org>, Andrea Arcangeli <aarcange@redhat.com>, Hugh Dickins <hughd@google.com> Cc: Dave Hansen <dave.hansen@intel.com>, Mel Gorman <mgorman@suse.de>, Rik van Riel <riel@redhat.com>, Vlastimil Babka <vbabka@suse.cz>, Christoph Lameter <cl@gentwo.org>, Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>, Steve Capper <steve.capper@linaro.org>, "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>, Johannes Weiner <hannes@cmpxchg.org>, Michal Hocko <mhocko@suse.cz>, Jerome Marchand <jmarchan@redhat.com>, Sasha Levin <sasha.levin@oracle.com>, linux-kernel@vger.kernel.org, linux-mm@kvack.org, "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Subject: [PATCH 19/36] mips, thp: remove infrastructure for handling splitting PMDs Date: Fri, 10 Jul 2015 20:41:53 +0300 [thread overview] Message-ID: <1436550130-112636-20-git-send-email-kirill.shutemov@linux.intel.com> (raw) In-Reply-To: <1436550130-112636-1-git-send-email-kirill.shutemov@linux.intel.com> With new refcounting we don't need to mark PMDs splitting. Let's drop code to handle this. pmdp_splitting_flush() is not needed too: on splitting PMD we will do pmdp_clear_flush() + set_pte_at(). pmdp_clear_flush() will do IPI as needed for fast_gup. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> --- arch/mips/include/asm/pgtable-bits.h | 6 ++---- arch/mips/include/asm/pgtable.h | 18 ------------------ arch/mips/mm/gup.c | 13 +------------ arch/mips/mm/pgtable-64.c | 14 -------------- arch/mips/mm/tlbex.c | 1 - 5 files changed, 3 insertions(+), 49 deletions(-) diff --git a/arch/mips/include/asm/pgtable-bits.h b/arch/mips/include/asm/pgtable-bits.h index c28a8499aec7..9bf8b2b87364 100644 --- a/arch/mips/include/asm/pgtable-bits.h +++ b/arch/mips/include/asm/pgtable-bits.h @@ -131,14 +131,12 @@ /* Huge TLB page */ #define _PAGE_HUGE_SHIFT (_PAGE_MODIFIED_SHIFT + 1) #define _PAGE_HUGE (1 << _PAGE_HUGE_SHIFT) -#define _PAGE_SPLITTING_SHIFT (_PAGE_HUGE_SHIFT + 1) -#define _PAGE_SPLITTING (1 << _PAGE_SPLITTING_SHIFT) /* Only R2 or newer cores have the XI bit */ #if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6) -#define _PAGE_NO_EXEC_SHIFT (_PAGE_SPLITTING_SHIFT + 1) +#define _PAGE_NO_EXEC_SHIFT (_PAGE_HUGE_SHIFT + 1) #else -#define _PAGE_GLOBAL_SHIFT (_PAGE_SPLITTING_SHIFT + 1) +#define _PAGE_GLOBAL_SHIFT (_PAGE_HUGE_SHIFT + 1) #define _PAGE_GLOBAL (1 << _PAGE_GLOBAL_SHIFT) #endif /* CONFIG_CPU_MIPSR2 || CONFIG_CPU_MIPSR6 */ diff --git a/arch/mips/include/asm/pgtable.h b/arch/mips/include/asm/pgtable.h index 9d8106758142..556c02a0706a 100644 --- a/arch/mips/include/asm/pgtable.h +++ b/arch/mips/include/asm/pgtable.h @@ -449,27 +449,9 @@ static inline pmd_t pmd_mkhuge(pmd_t pmd) return pmd; } -static inline int pmd_trans_splitting(pmd_t pmd) -{ - return !!(pmd_val(pmd) & _PAGE_SPLITTING); -} - -static inline pmd_t pmd_mksplitting(pmd_t pmd) -{ - pmd_val(pmd) |= _PAGE_SPLITTING; - - return pmd; -} - extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, pmd_t pmd); -#define __HAVE_ARCH_PMDP_SPLITTING_FLUSH -/* Extern to avoid header file madness */ -extern void pmdp_splitting_flush(struct vm_area_struct *vma, - unsigned long address, - pmd_t *pmdp); - #define __HAVE_ARCH_PMD_WRITE static inline int pmd_write(pmd_t pmd) { diff --git a/arch/mips/mm/gup.c b/arch/mips/mm/gup.c index 36a35115dc2e..1afd87c999b0 100644 --- a/arch/mips/mm/gup.c +++ b/arch/mips/mm/gup.c @@ -107,18 +107,7 @@ static int gup_pmd_range(pud_t pud, unsigned long addr, unsigned long end, pmd_t pmd = *pmdp; next = pmd_addr_end(addr, end); - /* - * The pmd_trans_splitting() check below explains why - * pmdp_splitting_flush has to flush the tlb, to stop - * this gup-fast code from running while we set the - * splitting bit in the pmd. Returning zero will take - * the slow path that will call wait_split_huge_page() - * if the pmd is still in splitting state. gup-fast - * can't because it has irq disabled and - * wait_split_huge_page() would never return as the - * tlb flush IPI wouldn't run. - */ - if (pmd_none(pmd) || pmd_trans_splitting(pmd)) + if (pmd_none(pmd)) return 0; if (unlikely(pmd_huge(pmd))) { if (!gup_huge_pmd(pmd, addr, next, write, pages,nr)) diff --git a/arch/mips/mm/pgtable-64.c b/arch/mips/mm/pgtable-64.c index e8adc0069d66..ce4473e7c0d2 100644 --- a/arch/mips/mm/pgtable-64.c +++ b/arch/mips/mm/pgtable-64.c @@ -62,20 +62,6 @@ void pmd_init(unsigned long addr, unsigned long pagetable) } #endif -#ifdef CONFIG_TRANSPARENT_HUGEPAGE - -void pmdp_splitting_flush(struct vm_area_struct *vma, - unsigned long address, - pmd_t *pmdp) -{ - if (!pmd_trans_splitting(*pmdp)) { - pmd_t pmd = pmd_mksplitting(*pmdp); - set_pmd_at(vma->vm_mm, address, pmdp, pmd); - } -} - -#endif - pmd_t mk_pmd(struct page *page, pgprot_t prot) { pmd_t pmd; diff --git a/arch/mips/mm/tlbex.c b/arch/mips/mm/tlbex.c index 97c87027c17f..02b53ce7fc2e 100644 --- a/arch/mips/mm/tlbex.c +++ b/arch/mips/mm/tlbex.c @@ -240,7 +240,6 @@ static void output_pgtable_bits_defines(void) pr_define("_PAGE_MODIFIED_SHIFT %d\n", _PAGE_MODIFIED_SHIFT); #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT pr_define("_PAGE_HUGE_SHIFT %d\n", _PAGE_HUGE_SHIFT); - pr_define("_PAGE_SPLITTING_SHIFT %d\n", _PAGE_SPLITTING_SHIFT); #endif #ifdef CONFIG_CPU_MIPSR2 if (cpu_has_rixi) { -- 2.1.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2015-07-10 17:45 UTC|newest] Thread overview: 97+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-07-10 17:41 [PATCH 00/36] THP refcounting redesign Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 01/36] mm, proc: adjust PSS calculation Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 02/36] rmap: add argument to charge compound page Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 03/36] memcg: adjust to support new THP refcounting Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-14 13:58 ` Kirill A. Shutemov 2015-07-14 13:58 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 04/36] mm, thp: adjust conditions when we can reuse the page on WP fault Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 05/36] mm: adjust FOLL_SPLIT for new refcounting Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 06/36] mm: handle PTE-mapped tail pages in gerneric fast gup implementaiton Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 07/36] thp, mlock: do not allow huge pages in mlocked area Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 08/36] khugepaged: ignore pmd tables with THP mapped with ptes Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 09/36] thp: rename split_huge_page_pmd() to split_huge_pmd() Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 10/36] mm, vmstats: new THP splitting event Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 11/36] mm: temporally mark THP broken Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 12/36] thp: drop all split_huge_page()-related code Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 13/36] mm: drop tail page refcounting Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-14 14:01 ` Kirill A. Shutemov 2015-07-14 14:01 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 14/36] futex, thp: remove special case for THP in get_futex_key Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 15/36] ksm: prepare to new THP semantics Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 16/36] mm, thp: remove compound_lock Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-14 14:02 ` Kirill A. Shutemov 2015-07-14 14:02 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 17/36] arm64, thp: remove infrastructure for handling splitting PMDs Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-15 15:23 ` Suzuki K. Poulose 2015-07-15 15:23 ` Suzuki K. Poulose 2015-07-10 17:41 ` [PATCH 18/36] arm, " Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov [this message] 2015-07-10 17:41 ` [PATCH 19/36] mips, " Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 20/36] powerpc, " Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-15 11:31 ` Aneesh Kumar K.V 2015-07-15 11:31 ` Aneesh Kumar K.V 2015-07-10 17:41 ` [PATCH 21/36] s390, " Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 22/36] sparc, " Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 23/36] tile, " Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 24/36] x86, " Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:41 ` [PATCH 25/36] mm, " Kirill A. Shutemov 2015-07-10 17:41 ` Kirill A. Shutemov 2015-07-10 17:42 ` [PATCH 26/36] mm: rework mapcount accounting to enable 4k mapping of THPs Kirill A. Shutemov 2015-07-10 17:42 ` Kirill A. Shutemov 2015-07-12 19:13 ` Kirill A. Shutemov 2015-07-12 19:13 ` Kirill A. Shutemov 2015-07-14 14:04 ` Kirill A. Shutemov 2015-07-14 14:04 ` Kirill A. Shutemov 2015-07-10 17:42 ` [PATCH 27/36] mm: differentiate page_mapped() from page_mapcount() for compound pages Kirill A. Shutemov 2015-07-10 17:42 ` Kirill A. Shutemov 2015-07-10 17:42 ` [PATCH 28/36] mm, numa: skip PTE-mapped THP on numa fault Kirill A. Shutemov 2015-07-10 17:42 ` Kirill A. Shutemov 2015-07-10 17:42 ` [PATCH 29/36] thp: implement split_huge_pmd() Kirill A. Shutemov 2015-07-10 17:42 ` Kirill A. Shutemov 2015-07-10 17:42 ` [PATCH 30/36] thp: add option to setup migration entiries during PMD split Kirill A. Shutemov 2015-07-10 17:42 ` Kirill A. Shutemov 2015-07-10 17:42 ` [PATCH 31/36] thp, mm: split_huge_page(): caller need to lock page Kirill A. Shutemov 2015-07-10 17:42 ` Kirill A. Shutemov 2015-07-10 17:42 ` [PATCH 32/36] thp: reintroduce split_huge_page() Kirill A. Shutemov 2015-07-10 17:42 ` Kirill A. Shutemov 2015-07-14 14:04 ` Kirill A. Shutemov 2015-07-14 14:04 ` Kirill A. Shutemov 2015-07-10 17:42 ` [PATCH 33/36] migrate_pages: try to split pages on qeueuing Kirill A. Shutemov 2015-07-10 17:42 ` Kirill A. Shutemov 2015-07-10 17:42 ` [PATCH 34/36] thp: introduce deferred_split_huge_page() Kirill A. Shutemov 2015-07-10 17:42 ` Kirill A. Shutemov 2015-07-10 17:42 ` [PATCH 35/36] mm: re-enable THP Kirill A. Shutemov 2015-07-10 17:42 ` Kirill A. Shutemov 2015-07-10 17:42 ` [PATCH 36/36] thp: update documentation Kirill A. Shutemov 2015-07-10 17:42 ` Kirill A. Shutemov 2015-07-14 14:05 ` Kirill A. Shutemov 2015-07-14 14:05 ` Kirill A. Shutemov 2015-07-14 9:06 ` [PATCH 00/36] THP refcounting redesign Jerome Marchand 2015-07-14 15:29 ` Kirill A. Shutemov 2015-07-14 15:29 ` Kirill A. Shutemov 2015-07-15 11:30 ` Aneesh Kumar K.V 2015-07-15 11:30 ` Aneesh Kumar K.V
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