From: Leonardo Bras <leonardo@linux.ibm.com> To: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Cc: Leonardo Bras <leonardo@linux.ibm.com>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Paul Mackerras <paulus@samba.org>, Michael Ellerman <mpe@ellerman.id.au>, Arnd Bergmann <arnd@arndb.de>, "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>, Christophe Leroy <christophe.leroy@c-s.fr>, Andrew Morton <akpm@linux-foundation.org>, Dan Williams <dan.j.williams@intel.com>, Nicholas Piggin <npiggin@gmail.com>, Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>, Thomas Gleixner <tglx@linutronix.de>, Richard Fontana <rfontana@redhat.com>, Ganesh Goudar <ganeshgr@linux.ibm.com>, Allison Randal <allison@lohutok.net>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Mike Rapoport <rppt@linux.ibm.com>, YueHaibing <yuehaibing@huawei.com>, Ira Weiny <ira.weiny@intel.com>, Jason Gunthorpe <jgg@ziepe.ca>, John Hubbard <jhubbard@nvidia.com>, Keith Busch <keith.busch@intel.com> Subject: [PATCH v2 06/11] powerpc/mm/book3s64/hash: Applies counting method to monitor lockless pgtbl walks Date: Fri, 20 Sep 2019 16:50:42 -0300 [thread overview] Message-ID: <20190920195047.7703-7-leonardo@linux.ibm.com> (raw) In-Reply-To: <20190920195047.7703-1-leonardo@linux.ibm.com> Applies the counting-based method for monitoring all hash-related functions that do lockless pagetable walks. Signed-off-by: Leonardo Bras <leonardo@linux.ibm.com> --- arch/powerpc/mm/book3s64/hash_tlb.c | 2 ++ arch/powerpc/mm/book3s64/hash_utils.c | 7 +++++++ 2 files changed, 9 insertions(+) diff --git a/arch/powerpc/mm/book3s64/hash_tlb.c b/arch/powerpc/mm/book3s64/hash_tlb.c index 4a70d8dd39cd..5e5213c3f7c4 100644 --- a/arch/powerpc/mm/book3s64/hash_tlb.c +++ b/arch/powerpc/mm/book3s64/hash_tlb.c @@ -209,6 +209,7 @@ void __flush_hash_table_range(struct mm_struct *mm, unsigned long start, * to being hashed). This is not the most performance oriented * way to do things but is fine for our needs here. */ + start_lockless_pgtbl_walk(mm); local_irq_save(flags); arch_enter_lazy_mmu_mode(); for (; start < end; start += PAGE_SIZE) { @@ -230,6 +231,7 @@ void __flush_hash_table_range(struct mm_struct *mm, unsigned long start, } arch_leave_lazy_mmu_mode(); local_irq_restore(flags); + end_lockless_pgtbl_walk(mm); } void flush_tlb_pmd_range(struct mm_struct *mm, pmd_t *pmd, unsigned long addr) diff --git a/arch/powerpc/mm/book3s64/hash_utils.c b/arch/powerpc/mm/book3s64/hash_utils.c index b8ad14bb1170..299946cedc3a 100644 --- a/arch/powerpc/mm/book3s64/hash_utils.c +++ b/arch/powerpc/mm/book3s64/hash_utils.c @@ -1322,6 +1322,7 @@ int hash_page_mm(struct mm_struct *mm, unsigned long ea, #endif /* CONFIG_PPC_64K_PAGES */ /* Get PTE and page size from page tables */ + start_lockless_pgtbl_walk(mm); ptep = find_linux_pte(pgdir, ea, &is_thp, &hugeshift); if (ptep == NULL || !pte_present(*ptep)) { DBG_LOW(" no PTE !\n"); @@ -1438,6 +1439,7 @@ int hash_page_mm(struct mm_struct *mm, unsigned long ea, DBG_LOW(" -> rc=%d\n", rc); bail: + end_lockless_pgtbl_walk(mm); exception_exit(prev_state); return rc; } @@ -1547,10 +1549,12 @@ void hash_preload(struct mm_struct *mm, unsigned long ea, vsid = get_user_vsid(&mm->context, ea, ssize); if (!vsid) return; + /* * Hash doesn't like irqs. Walking linux page table with irq disabled * saves us from holding multiple locks. */ + start_lockless_pgtbl_walk(mm); local_irq_save(flags); /* @@ -1597,6 +1601,7 @@ void hash_preload(struct mm_struct *mm, unsigned long ea, pte_val(*ptep)); out_exit: local_irq_restore(flags); + end_lockless_pgtbl_walk(mm); } #ifdef CONFIG_PPC_MEM_KEYS @@ -1613,11 +1618,13 @@ u16 get_mm_addr_key(struct mm_struct *mm, unsigned long address) if (!mm || !mm->pgd) return 0; + start_lockless_pgtbl_walk(mm); local_irq_save(flags); ptep = find_linux_pte(mm->pgd, address, NULL, NULL); if (ptep) pkey = pte_to_pkey_bits(pte_val(READ_ONCE(*ptep))); local_irq_restore(flags); + end_lockless_pgtbl_walk(mm); return pkey; } -- 2.20.1
WARNING: multiple messages have this Message-ID (diff)
From: Leonardo Bras <leonardo@linux.ibm.com> To: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Cc: Keith Busch <keith.busch@intel.com>, Richard Fontana <rfontana@redhat.com>, Paul Mackerras <paulus@samba.org>, Ira Weiny <ira.weiny@intel.com>, Dan Williams <dan.j.williams@intel.com>, "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>, YueHaibing <yuehaibing@huawei.com>, Mike Rapoport <rppt@linux.ibm.com>, Jason Gunthorpe <jgg@ziepe.ca>, Ganesh Goudar <ganeshgr@linux.ibm.com>, Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>, Leonardo Bras <leonardo@linux.ibm.com>, Arnd Bergmann <arnd@arndb.de>, John Hubbard <jhubbard@nvidia.com>, Nicholas Piggin <npiggin@gmail.com>, Thomas Gleixner <tglx@linutronix.de>, Allison Randal <allison@lohutok.net>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Andrew Morton <akpm@linux-foundation.org> Subject: [PATCH v2 06/11] powerpc/mm/book3s64/hash: Applies counting method to monitor lockless pgtbl walks Date: Fri, 20 Sep 2019 16:50:42 -0300 [thread overview] Message-ID: <20190920195047.7703-7-leonardo@linux.ibm.com> (raw) In-Reply-To: <20190920195047.7703-1-leonardo@linux.ibm.com> Applies the counting-based method for monitoring all hash-related functions that do lockless pagetable walks. Signed-off-by: Leonardo Bras <leonardo@linux.ibm.com> --- arch/powerpc/mm/book3s64/hash_tlb.c | 2 ++ arch/powerpc/mm/book3s64/hash_utils.c | 7 +++++++ 2 files changed, 9 insertions(+) diff --git a/arch/powerpc/mm/book3s64/hash_tlb.c b/arch/powerpc/mm/book3s64/hash_tlb.c index 4a70d8dd39cd..5e5213c3f7c4 100644 --- a/arch/powerpc/mm/book3s64/hash_tlb.c +++ b/arch/powerpc/mm/book3s64/hash_tlb.c @@ -209,6 +209,7 @@ void __flush_hash_table_range(struct mm_struct *mm, unsigned long start, * to being hashed). This is not the most performance oriented * way to do things but is fine for our needs here. */ + start_lockless_pgtbl_walk(mm); local_irq_save(flags); arch_enter_lazy_mmu_mode(); for (; start < end; start += PAGE_SIZE) { @@ -230,6 +231,7 @@ void __flush_hash_table_range(struct mm_struct *mm, unsigned long start, } arch_leave_lazy_mmu_mode(); local_irq_restore(flags); + end_lockless_pgtbl_walk(mm); } void flush_tlb_pmd_range(struct mm_struct *mm, pmd_t *pmd, unsigned long addr) diff --git a/arch/powerpc/mm/book3s64/hash_utils.c b/arch/powerpc/mm/book3s64/hash_utils.c index b8ad14bb1170..299946cedc3a 100644 --- a/arch/powerpc/mm/book3s64/hash_utils.c +++ b/arch/powerpc/mm/book3s64/hash_utils.c @@ -1322,6 +1322,7 @@ int hash_page_mm(struct mm_struct *mm, unsigned long ea, #endif /* CONFIG_PPC_64K_PAGES */ /* Get PTE and page size from page tables */ + start_lockless_pgtbl_walk(mm); ptep = find_linux_pte(pgdir, ea, &is_thp, &hugeshift); if (ptep == NULL || !pte_present(*ptep)) { DBG_LOW(" no PTE !\n"); @@ -1438,6 +1439,7 @@ int hash_page_mm(struct mm_struct *mm, unsigned long ea, DBG_LOW(" -> rc=%d\n", rc); bail: + end_lockless_pgtbl_walk(mm); exception_exit(prev_state); return rc; } @@ -1547,10 +1549,12 @@ void hash_preload(struct mm_struct *mm, unsigned long ea, vsid = get_user_vsid(&mm->context, ea, ssize); if (!vsid) return; + /* * Hash doesn't like irqs. Walking linux page table with irq disabled * saves us from holding multiple locks. */ + start_lockless_pgtbl_walk(mm); local_irq_save(flags); /* @@ -1597,6 +1601,7 @@ void hash_preload(struct mm_struct *mm, unsigned long ea, pte_val(*ptep)); out_exit: local_irq_restore(flags); + end_lockless_pgtbl_walk(mm); } #ifdef CONFIG_PPC_MEM_KEYS @@ -1613,11 +1618,13 @@ u16 get_mm_addr_key(struct mm_struct *mm, unsigned long address) if (!mm || !mm->pgd) return 0; + start_lockless_pgtbl_walk(mm); local_irq_save(flags); ptep = find_linux_pte(mm->pgd, address, NULL, NULL); if (ptep) pkey = pte_to_pkey_bits(pte_val(READ_ONCE(*ptep))); local_irq_restore(flags); + end_lockless_pgtbl_walk(mm); return pkey; } -- 2.20.1
next prev parent reply other threads:[~2019-09-20 19:52 UTC|newest] Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-09-20 19:50 [PATCH v2 00/11] Introduces new count-based method for monitoring lockless pagetable wakls Leonardo Bras 2019-09-20 19:50 ` Leonardo Bras 2019-09-20 19:50 ` [PATCH v2 01/11] powerpc/mm: Adds counting method to monitor lockless pgtable walks Leonardo Bras 2019-09-20 19:50 ` Leonardo Bras 2019-09-23 20:42 ` John Hubbard 2019-09-23 20:42 ` John Hubbard 2019-09-23 20:50 ` Leonardo Bras 2019-09-23 20:50 ` Leonardo Bras 2019-09-20 19:50 ` [PATCH v2 02/11] asm-generic/pgtable: Adds dummy functions " Leonardo Bras 2019-09-20 19:50 ` Leonardo Bras 2019-09-23 20:39 ` John Hubbard 2019-09-23 20:39 ` John Hubbard 2019-09-23 20:48 ` Leonardo Bras 2019-09-23 20:48 ` Leonardo Bras 2019-09-23 20:53 ` John Hubbard 2019-09-23 20:53 ` John Hubbard 2019-09-20 19:50 ` [PATCH v2 03/11] mm/gup: Applies counting method to monitor gup_pgd_range Leonardo Bras 2019-09-20 19:50 ` Leonardo Bras 2019-09-23 20:27 ` John Hubbard 2019-09-23 20:27 ` John Hubbard 2019-09-23 21:01 ` Leonardo Bras 2019-09-23 21:01 ` Leonardo Bras 2019-09-23 21:09 ` John Hubbard 2019-09-23 21:09 ` John Hubbard 2019-09-20 19:50 ` [PATCH v2 04/11] powerpc/mce_power: Applies counting method to monitor lockless pgtbl walks Leonardo Bras 2019-09-20 19:50 ` Leonardo Bras 2019-09-20 19:50 ` [PATCH v2 05/11] powerpc/perf: " Leonardo Bras 2019-09-20 19:50 ` Leonardo Bras 2019-09-20 19:50 ` Leonardo Bras [this message] 2019-09-20 19:50 ` [PATCH v2 06/11] powerpc/mm/book3s64/hash: " Leonardo Bras 2019-09-20 19:50 ` [PATCH v2 07/11] powerpc/kvm/e500: " Leonardo Bras 2019-09-20 19:50 ` Leonardo Bras 2019-09-20 19:50 ` [PATCH v2 08/11] powerpc/kvm/book3s_hv: " Leonardo Bras 2019-09-20 19:50 ` Leonardo Bras 2019-09-23 20:47 ` John Hubbard 2019-09-23 20:47 ` John Hubbard 2019-09-20 19:50 ` [PATCH v2 09/11] powerpc/kvm/book3s_64: " Leonardo Bras 2019-09-20 19:50 ` Leonardo Bras 2019-09-20 19:50 ` [PATCH v2 10/11] powerpc/book3s_64: Enables counting method to monitor lockless pgtbl walk Leonardo Bras 2019-09-20 19:50 ` Leonardo Bras 2019-09-20 19:50 ` [PATCH v2 11/11] powerpc/mm/book3s64/pgtable: Uses counting method to skip serializing Leonardo Bras 2019-09-20 19:50 ` Leonardo Bras 2019-09-20 20:11 ` John Hubbard 2019-09-20 20:28 ` Leonardo Bras 2019-09-20 20:28 ` Leonardo Bras 2019-09-20 21:15 ` John Hubbard 2019-09-21 0:48 ` John Hubbard 2019-09-21 0:48 ` John Hubbard 2019-09-23 17:25 ` Leonardo Bras 2019-09-23 17:25 ` Leonardo Bras 2019-09-23 18:14 ` John Hubbard 2019-09-23 18:14 ` John Hubbard 2019-09-23 19:40 ` Leonardo Bras 2019-09-23 19:40 ` Leonardo Bras 2019-09-23 19:58 ` John Hubbard 2019-09-23 19:58 ` John Hubbard 2019-09-23 20:23 ` Leonardo Bras 2019-09-23 20:23 ` Leonardo Bras 2019-09-23 20:26 ` John Hubbard 2019-09-23 20:26 ` John Hubbard 2019-09-20 19:56 ` [PATCH v2 00/11] Introduces new count-based method for monitoring lockless pagetable wakls Leonardo Bras 2019-09-20 19:56 ` Leonardo Bras 2019-09-20 20:12 ` Leonardo Bras 2019-09-20 20:12 ` Leonardo Bras 2019-09-20 21:24 ` John Hubbard 2019-09-20 21:24 ` John Hubbard 2019-09-23 20:51 ` John Hubbard 2019-09-23 20:51 ` John Hubbard 2019-09-23 20:58 ` Leonardo Bras 2019-09-23 20:58 ` Leonardo Bras
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