[v5,01/25] mm: Do page fault accounting in handle_mm_fault

Message ID	20200707225021.200906-2-peterx@redhat.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <SRS0=oiSc=AS=kvack.org=owner-linux-mm@kernel.org> DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2A4A0206BE From: Peter Xu <peterx@redhat.com> To: linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com>, Linus Torvalds <torvalds@linux-foundation.org>, peterx@redhat.com, Andrew Morton <akpm@linux-foundation.org>, Will Deacon <will@kernel.org>, Andrea Arcangeli <aarcange@redhat.com>, David Rientjes <rientjes@google.com>, John Hubbard <jhubbard@nvidia.com>, Michael Ellerman <mpe@ellerman.id.au> Subject: [PATCH v5 01/25] mm: Do page fault accounting in handle_mm_fault Date: Tue, 7 Jul 2020 18:49:57 -0400 Message-Id: <20200707225021.200906-2-peterx@redhat.com> In-Reply-To: <20200707225021.200906-1-peterx@redhat.com> References: <20200707225021.200906-1-peterx@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable Sender: owner-linux-mm@kvack.org Precedence: bulk
Series	mm: Page fault accounting cleanups \| expand [v5,00/25] mm: Page fault accounting cleanups [v5,01/25] mm: Do page fault accounting in handle_mm_fault [v5,02/25] mm/alpha: Use general page fault accounting [v5,03/25] mm/arc: Use general page fault accounting [v5,04/25] mm/arm: Use general page fault accounting [v5,05/25] mm/arm64: Use general page fault accounting [v5,06/25] mm/csky: Use general page fault accounting [v5,07/25] mm/hexagon: Use general page fault accounting [v5,08/25] mm/ia64: Use general page fault accounting [v5,09/25] mm/m68k: Use general page fault accounting [v5,10/25] mm/microblaze: Use general page fault accounting [v5,11/25] mm/mips: Use general page fault accounting [v5,12/25] mm/nds32: Use general page fault accounting [v5,13/25] mm/nios2: Use general page fault accounting [v5,14/25] mm/openrisc: Use general page fault accounting [v5,15/25] mm/parisc: Use general page fault accounting [v5,16/25] mm/powerpc: Use general page fault accounting [v5,17/25] mm/riscv: Use general page fault accounting [v5,18/25] mm/s390: Use general page fault accounting [v5,19/25] mm/sh: Use general page fault accounting [v5,20/25] mm/sparc32: Use general page fault accounting [v5,21/25] mm/sparc64: Use general page fault accounting [v5,22/25] mm/x86: Use general page fault accounting [v5,23/25] mm/xtensa: Use general page fault accounting [v5,24/25] mm: Clean up the last pieces of page fault accountings [v5,25/25] mm/gup: Remove task_struct pointer for all gup code

diff --git a/arch/alpha/mm/fault.c b/arch/alpha/mm/fault.c index c2303a8c2b9f..1983e43a5e2f 100644 --- a/arch/alpha/mm/fault.c +++ b/arch/alpha/mm/fault.c @@ -148,7 +148,7 @@ do_page_fault(unsigned long address, unsigned long mmcsr, /* If for any reason at all we couldn't handle the fault, make sure we exit gracefully rather than endlessly redo the fault. */ - fault = handle_mm_fault(vma, address, flags); + fault = handle_mm_fault(vma, address, flags, NULL); if (fault_signal_pending(fault, regs)) return; diff --git a/arch/arc/mm/fault.c b/arch/arc/mm/fault.c index 7287c793d1c9..587dea524e6b 100644 --- a/arch/arc/mm/fault.c +++ b/arch/arc/mm/fault.c @@ -130,7 +130,7 @@ void do_page_fault(unsigned long address, struct pt_regs *regs) goto bad_area; } - fault = handle_mm_fault(vma, address, flags); + fault = handle_mm_fault(vma, address, flags, NULL); /* Quick path to respond to signals */ if (fault_signal_pending(fault, regs)) { diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c index c6550eddfce1..01a8e0f8fef7 100644 --- a/arch/arm/mm/fault.c +++ b/arch/arm/mm/fault.c @@ -224,7 +224,7 @@ __do_page_fault(struct mm_struct *mm, unsigned long addr, unsigned int fsr, goto out; } - return handle_mm_fault(vma, addr & PAGE_MASK, flags); + return handle_mm_fault(vma, addr & PAGE_MASK, flags, NULL); check_stack: /* Don't allow expansion below FIRST_USER_ADDRESS */ diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c index 5e832b3387f1..f885940035ce 100644 --- a/arch/arm64/mm/fault.c +++ b/arch/arm64/mm/fault.c @@ -428,7 +428,7 @@ static vm_fault_t __do_page_fault(struct mm_struct *mm, unsigned long addr, */ if (!(vma->vm_flags & vm_flags)) return VM_FAULT_BADACCESS; - return handle_mm_fault(vma, addr & PAGE_MASK, mm_flags); + return handle_mm_fault(vma, addr & PAGE_MASK, mm_flags, NULL); } static bool is_el0_instruction_abort(unsigned int esr) diff --git a/arch/csky/mm/fault.c b/arch/csky/mm/fault.c index 0b9cbf2cf6a9..7137e2e8dc57 100644 --- a/arch/csky/mm/fault.c +++ b/arch/csky/mm/fault.c @@ -150,7 +150,8 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write, * make sure we exit gracefully rather than endlessly redo * the fault. */ - fault = handle_mm_fault(vma, address, write ? FAULT_FLAG_WRITE : 0); + fault = handle_mm_fault(vma, address, write ? FAULT_FLAG_WRITE : 0, + NULL); if (unlikely(fault & VM_FAULT_ERROR)) { if (fault & VM_FAULT_OOM) goto out_of_memory; diff --git a/arch/hexagon/mm/vm_fault.c b/arch/hexagon/mm/vm_fault.c index cd3808f96b93..f12f330e7946 100644 --- a/arch/hexagon/mm/vm_fault.c +++ b/arch/hexagon/mm/vm_fault.c @@ -88,7 +88,7 @@ void do_page_fault(unsigned long address, long cause, struct pt_regs *regs) break; } - fault = handle_mm_fault(vma, address, flags); + fault = handle_mm_fault(vma, address, flags, NULL); if (fault_signal_pending(fault, regs)) return; diff --git a/arch/ia64/mm/fault.c b/arch/ia64/mm/fault.c index 3a4dec334cc5..abf2808f9b4b 100644 --- a/arch/ia64/mm/fault.c +++ b/arch/ia64/mm/fault.c @@ -143,7 +143,7 @@ ia64_do_page_fault (unsigned long address, unsigned long isr, struct pt_regs *re * sure we exit gracefully rather than endlessly redo the * fault. */ - fault = handle_mm_fault(vma, address, flags); + fault = handle_mm_fault(vma, address, flags, NULL); if (fault_signal_pending(fault, regs)) return; diff --git a/arch/m68k/mm/fault.c b/arch/m68k/mm/fault.c index 508abb63da67..08b35a318ebe 100644 --- a/arch/m68k/mm/fault.c +++ b/arch/m68k/mm/fault.c @@ -134,7 +134,7 @@ int do_page_fault(struct pt_regs *regs, unsigned long address, * the fault. */ - fault = handle_mm_fault(vma, address, flags); + fault = handle_mm_fault(vma, address, flags, NULL); pr_debug("handle_mm_fault returns %x\n", fault); if (fault_signal_pending(fault, regs)) diff --git a/arch/microblaze/mm/fault.c b/arch/microblaze/mm/fault.c index a2bfe587b491..1a3d4c4ca28b 100644 --- a/arch/microblaze/mm/fault.c +++ b/arch/microblaze/mm/fault.c @@ -214,7 +214,7 @@ void do_page_fault(struct pt_regs *regs, unsigned long address, * make sure we exit gracefully rather than endlessly redo * the fault. */ - fault = handle_mm_fault(vma, address, flags); + fault = handle_mm_fault(vma, address, flags, NULL); if (fault_signal_pending(fault, regs)) return; diff --git a/arch/mips/mm/fault.c b/arch/mips/mm/fault.c index 01b168a90434..b1db39784db9 100644 --- a/arch/mips/mm/fault.c +++ b/arch/mips/mm/fault.c @@ -152,7 +152,7 @@ static void __kprobes __do_page_fault(struct pt_regs *regs, unsigned long write, * make sure we exit gracefully rather than endlessly redo * the fault. */ - fault = handle_mm_fault(vma, address, flags); + fault = handle_mm_fault(vma, address, flags, NULL); if (fault_signal_pending(fault, regs)) return; diff --git a/arch/nds32/mm/fault.c b/arch/nds32/mm/fault.c index 8fb73f6401a0..d0ecc8fb5b23 100644 --- a/arch/nds32/mm/fault.c +++ b/arch/nds32/mm/fault.c @@ -206,7 +206,7 @@ void do_page_fault(unsigned long entry, unsigned long addr, * the fault. */ - fault = handle_mm_fault(vma, addr, flags); + fault = handle_mm_fault(vma, addr, flags, NULL); /* * If we need to retry but a fatal signal is pending, handle the diff --git a/arch/nios2/mm/fault.c b/arch/nios2/mm/fault.c index 4112ef0e247e..86beb9a2698e 100644 --- a/arch/nios2/mm/fault.c +++ b/arch/nios2/mm/fault.c @@ -131,7 +131,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long cause, * make sure we exit gracefully rather than endlessly redo * the fault. */ - fault = handle_mm_fault(vma, address, flags); + fault = handle_mm_fault(vma, address, flags, NULL); if (fault_signal_pending(fault, regs)) return; diff --git a/arch/openrisc/mm/fault.c b/arch/openrisc/mm/fault.c index d2224ccca294..3daa491d1edb 100644 --- a/arch/openrisc/mm/fault.c +++ b/arch/openrisc/mm/fault.c @@ -159,7 +159,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long address, * the fault. */ - fault = handle_mm_fault(vma, address, flags); + fault = handle_mm_fault(vma, address, flags, NULL); if (fault_signal_pending(fault, regs)) return; diff --git a/arch/parisc/mm/fault.c b/arch/parisc/mm/fault.c index 66ac0719bd49..e32d06928c24 100644 --- a/arch/parisc/mm/fault.c +++ b/arch/parisc/mm/fault.c @@ -302,7 +302,7 @@ void do_page_fault(struct pt_regs *regs, unsigned long code, * fault. */ - fault = handle_mm_fault(vma, address, flags); + fault = handle_mm_fault(vma, address, flags, NULL); if (fault_signal_pending(fault, regs)) return; diff --git a/arch/powerpc/mm/copro_fault.c b/arch/powerpc/mm/copro_fault.c index b83abbead4a2..2d0276abe0a6 100644 --- a/arch/powerpc/mm/copro_fault.c +++ b/arch/powerpc/mm/copro_fault.c @@ -64,7 +64,7 @@ int copro_handle_mm_fault(struct mm_struct *mm, unsigned long ea, } ret = 0; - *flt = handle_mm_fault(vma, ea, is_write ? FAULT_FLAG_WRITE : 0); + *flt = handle_mm_fault(vma, ea, is_write ? FAULT_FLAG_WRITE : 0, NULL); if (unlikely(*flt & VM_FAULT_ERROR)) { if (*flt & VM_FAULT_OOM) { ret = -ENOMEM; diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c index 641fc5f3d7dd..25dee001d8e1 100644 --- a/arch/powerpc/mm/fault.c +++ b/arch/powerpc/mm/fault.c @@ -607,7 +607,7 @@ static int __do_page_fault(struct pt_regs *regs, unsigned long address, * make sure we exit gracefully rather than endlessly redo * the fault. */ - fault = handle_mm_fault(vma, address, flags); + fault = handle_mm_fault(vma, address, flags, NULL); major |= fault & VM_FAULT_MAJOR; diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c index 5873835a3e6b..30c1124d0fb6 100644 --- a/arch/riscv/mm/fault.c +++ b/arch/riscv/mm/fault.c @@ -109,7 +109,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs) * make sure we exit gracefully rather than endlessly redo * the fault. */ - fault = handle_mm_fault(vma, addr, flags); + fault = handle_mm_fault(vma, addr, flags, NULL); /* * If we need to retry but a fatal signal is pending, handle the diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c index d53c2e2ea1fd..fc14df0b4d6e 100644 --- a/arch/s390/mm/fault.c +++ b/arch/s390/mm/fault.c @@ -478,7 +478,7 @@ static inline vm_fault_t do_exception(struct pt_regs *regs, int access) * make sure we exit gracefully rather than endlessly redo * the fault. */ - fault = handle_mm_fault(vma, address, flags); + fault = handle_mm_fault(vma, address, flags, NULL); if (fault_signal_pending(fault, regs)) { fault = VM_FAULT_SIGNAL; if (flags & FAULT_FLAG_RETRY_NOWAIT) diff --git a/arch/sh/mm/fault.c b/arch/sh/mm/fault.c index fbe1f2fe9a8c..3c0a11827f7e 100644 --- a/arch/sh/mm/fault.c +++ b/arch/sh/mm/fault.c @@ -482,7 +482,7 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs, * make sure we exit gracefully rather than endlessly redo * the fault. */ - fault = handle_mm_fault(vma, address, flags); + fault = handle_mm_fault(vma, address, flags, NULL); if (unlikely(fault & (VM_FAULT_RETRY | VM_FAULT_ERROR))) if (mm_fault_error(regs, error_code, address, fault)) diff --git a/arch/sparc/mm/fault_32.c b/arch/sparc/mm/fault_32.c index cfef656eda0f..06af03db4417 100644 --- a/arch/sparc/mm/fault_32.c +++ b/arch/sparc/mm/fault_32.c @@ -234,7 +234,7 @@ asmlinkage void do_sparc_fault(struct pt_regs *regs, int text_fault, int write, * make sure we exit gracefully rather than endlessly redo * the fault. */ - fault = handle_mm_fault(vma, address, flags); + fault = handle_mm_fault(vma, address, flags, NULL); if (fault_signal_pending(fault, regs)) return; @@ -410,7 +410,7 @@ static void force_user_fault(unsigned long address, int write) if (!(vma->vm_flags & (VM_READ | VM_EXEC))) goto bad_area; } - switch (handle_mm_fault(vma, address, flags)) { + switch (handle_mm_fault(vma, address, flags, NULL)) { case VM_FAULT_SIGBUS: case VM_FAULT_OOM: goto do_sigbus; diff --git a/arch/sparc/mm/fault_64.c b/arch/sparc/mm/fault_64.c index a3806614e4dc..9ebee14ee893 100644 --- a/arch/sparc/mm/fault_64.c +++ b/arch/sparc/mm/fault_64.c @@ -422,7 +422,7 @@ asmlinkage void __kprobes do_sparc64_fault(struct pt_regs *regs) goto bad_area; } - fault = handle_mm_fault(vma, address, flags); + fault = handle_mm_fault(vma, address, flags, NULL); if (fault_signal_pending(fault, regs)) goto exit_exception; diff --git a/arch/um/kernel/trap.c b/arch/um/kernel/trap.c index 2b3afa354a90..8d9870d76da1 100644 --- a/arch/um/kernel/trap.c +++ b/arch/um/kernel/trap.c @@ -71,7 +71,7 @@ int handle_page_fault(unsigned long address, unsigned long ip, do { vm_fault_t fault; - fault = handle_mm_fault(vma, address, flags); + fault = handle_mm_fault(vma, address, flags, NULL); if ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current)) goto out_nosemaphore; diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index 02536b04d9f3..0adbff41adec 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -1291,7 +1291,7 @@ void do_user_addr_fault(struct pt_regs *regs, * userland). The return to userland is identified whenever * FAULT_FLAG_USER|FAULT_FLAG_KILLABLE are both set in flags. */ - fault = handle_mm_fault(vma, address, flags); + fault = handle_mm_fault(vma, address, flags, NULL); major |= fault & VM_FAULT_MAJOR; /* Quick path to respond to signals */ diff --git a/arch/xtensa/mm/fault.c b/arch/xtensa/mm/fault.c index c128dcc7c85b..e72c8c1359a6 100644 --- a/arch/xtensa/mm/fault.c +++ b/arch/xtensa/mm/fault.c @@ -107,7 +107,7 @@ void do_page_fault(struct pt_regs *regs) * make sure we exit gracefully rather than endlessly redo * the fault. */ - fault = handle_mm_fault(vma, address, flags); + fault = handle_mm_fault(vma, address, flags, NULL); if (fault_signal_pending(fault, regs)) return; diff --git a/drivers/iommu/amd/iommu_v2.c b/drivers/iommu/amd/iommu_v2.c index e4b025c5637c..c259108ab6dd 100644 --- a/drivers/iommu/amd/iommu_v2.c +++ b/drivers/iommu/amd/iommu_v2.c @@ -495,7 +495,7 @@ static void do_fault(struct work_struct *work) if (access_error(vma, fault)) goto out; - ret = handle_mm_fault(vma, address, flags); + ret = handle_mm_fault(vma, address, flags, NULL); out: mmap_read_unlock(mm); diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c index 6c87c807a0ab..5ae59a6ad681 100644 --- a/drivers/iommu/intel/svm.c +++ b/drivers/iommu/intel/svm.c @@ -872,7 +872,8 @@ static irqreturn_t prq_event_thread(int irq, void *d) goto invalid; ret = handle_mm_fault(vma, address, - req->wr_req ? FAULT_FLAG_WRITE : 0); + req->wr_req ? FAULT_FLAG_WRITE : 0, + NULL); if (ret & VM_FAULT_ERROR) goto invalid; diff --git a/include/linux/mm.h b/include/linux/mm.h index 809cbbf98fbc..33f8236a68a2 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -39,6 +39,7 @@ struct file_ra_state; struct user_struct; struct writeback_control; struct bdi_writeback; +struct pt_regs; void init_mm_internals(void); @@ -1659,7 +1660,8 @@ int invalidate_inode_page(struct page *page); #ifdef CONFIG_MMU extern vm_fault_t handle_mm_fault(struct vm_area_struct *vma, - unsigned long address, unsigned int flags); + unsigned long address, unsigned int flags, + struct pt_regs *regs); extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm, unsigned long address, unsigned int fault_flags, bool *unlocked); @@ -1669,7 +1671,8 @@ void unmap_mapping_range(struct address_space *mapping, loff_t const holebegin, loff_t const holelen, int even_cows); #else static inline vm_fault_t handle_mm_fault(struct vm_area_struct *vma, - unsigned long address, unsigned int flags) + unsigned long address, unsigned int flags, + struct pt_regs *regs) { /* should never happen if there's no MMU */ BUG(); diff --git a/mm/gup.c b/mm/gup.c index 6ec1807cd2a7..80fd1610d43e 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -884,7 +884,7 @@ static int faultin_page(struct task_struct *tsk, struct vm_area_struct *vma, fault_flags |= FAULT_FLAG_TRIED; } - ret = handle_mm_fault(vma, address, fault_flags); + ret = handle_mm_fault(vma, address, fault_flags, NULL); if (ret & VM_FAULT_ERROR) { int err = vm_fault_to_errno(ret, *flags); @@ -1238,7 +1238,7 @@ int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm, fatal_signal_pending(current)) return -EINTR; - ret = handle_mm_fault(vma, address, fault_flags); + ret = handle_mm_fault(vma, address, fault_flags, NULL); major |= ret & VM_FAULT_MAJOR; if (ret & VM_FAULT_ERROR) { int err = vm_fault_to_errno(ret, 0); diff --git a/mm/hmm.c b/mm/hmm.c index e9a545751108..0be32b8a47be 100644 --- a/mm/hmm.c +++ b/mm/hmm.c @@ -75,7 +75,8 @@ static int hmm_vma_fault(unsigned long addr, unsigned long end, } for (; addr < end; addr += PAGE_SIZE) - if (handle_mm_fault(vma, addr, fault_flags) & VM_FAULT_ERROR) + if (handle_mm_fault(vma, addr, fault_flags, NULL) & + VM_FAULT_ERROR) return -EFAULT; return -EBUSY; } diff --git a/mm/ksm.c b/mm/ksm.c index 5fb176d497ea..90a625b02a1d 100644 --- a/mm/ksm.c +++ b/mm/ksm.c @@ -480,7 +480,8 @@ static int break_ksm(struct vm_area_struct *vma, unsigned long addr) break; if (PageKsm(page)) ret = handle_mm_fault(vma, addr, - FAULT_FLAG_WRITE | FAULT_FLAG_REMOTE); + FAULT_FLAG_WRITE | FAULT_FLAG_REMOTE, + NULL); else ret = VM_FAULT_WRITE; put_page(page); diff --git a/mm/memory.c b/mm/memory.c index 072c72d88471..bb7ba127661a 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -71,6 +71,8 @@ #include <linux/dax.h> #include <linux/oom.h> #include <linux/numa.h> +#include <linux/perf_event.h> +#include <linux/ptrace.h> #include <trace/events/kmem.h> @@ -4360,6 +4362,64 @@ static vm_fault_t __handle_mm_fault(struct vm_area_struct *vma, return handle_pte_fault(&vmf); } +/** + * mm_account_fault - Do page fault accountings + * + * @regs: the pt_regs struct pointer. When set to NULL, will skip accounting + * of perf event counters, but we'll still do the per-task accounting to + * the task who triggered this page fault. + * @address: the faulted address. + * @flags: the fault flags. + * @ret: the fault retcode. + * + * This will take care of most of the page fault accountings. Meanwhile, it + * will also include the PERF_COUNT_SW_PAGE_FAULTS_[MAJ|MIN] perf counter + * updates. However note that the handling of PERF_COUNT_SW_PAGE_FAULTS should + * still be in per-arch page fault handlers at the entry of page fault. + */ +static inline void mm_account_fault(struct pt_regs *regs, + unsigned long address, unsigned int flags, + vm_fault_t ret) +{ + bool major; + + /* + * We don't do accounting for some specific faults: + * + * - Unsuccessful faults (e.g. when the address wasn't valid). That + * includes arch_vma_access_permitted() failing before reaching here. + * So this is not a "this many hardware page faults" counter. We + * should use the hw profiling for that. + * + * - Incomplete faults (VM_FAULT_RETRY). They will only be counted + * once they're completed. + */ + if (ret & (VM_FAULT_ERROR | VM_FAULT_RETRY)) + return; + + /* + * We define the fault as a major fault when the final successful fault + * is VM_FAULT_MAJOR, or if it retried (which implies that we couldn't + * handle it immediately previously). + */ + major = (ret & VM_FAULT_MAJOR) || (flags & FAULT_FLAG_TRIED); + + /* + * If the fault is done for GUP, regs will be NULL, and we will skip + * the fault accounting. + */ + if (!regs) + return; + + if (major) { + current->maj_flt++; + perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, regs, address); + } else { + current->min_flt++; + perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, regs, address); + } +} + /* * By the time we get here, we already hold the mm semaphore * @@ -4367,7 +4427,7 @@ static vm_fault_t __handle_mm_fault(struct vm_area_struct *vma, * return value. See filemap_fault() and __lock_page_or_retry(). */ vm_fault_t handle_mm_fault(struct vm_area_struct *vma, unsigned long address, - unsigned int flags) + unsigned int flags, struct pt_regs *regs) { vm_fault_t ret; @@ -4408,6 +4468,8 @@ vm_fault_t handle_mm_fault(struct vm_area_struct *vma, unsigned long address, mem_cgroup_oom_synchronize(false); } + mm_account_fault(regs, address, flags, ret); + return ret; } EXPORT_SYMBOL_GPL(handle_mm_fault);

[v5,01/25] mm: Do page fault accounting in handle_mm_fault

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