mm: do page fault accounting in handle_mm_fault

Patch series "mm: Page fault accounting cleanups", v5.

This is v5 of the pf accounting cleanup series.  It originates from Gerald
Schaefer's report on an issue a week ago regarding to incorrect page fault
accountings for retried page fault after commit 4064b9827063 ("mm: allow
VM_FAULT_RETRY for multiple times"):

  https://lore.kernel.org/lkml/20200610174811.44b94525@thinkpad/

What this series did:

  - Correct page fault accounting: we do accounting for a page fault
    (no matter whether it's from #PF handling, or gup, or anything else)
    only with the one that completed the fault.  For example, page fault
    retries should not be counted in page fault counters.  Same to the
    perf events.

  - Unify definition of PERF_COUNT_SW_PAGE_FAULTS: currently this perf
    event is used in an adhoc way across different archs.

    Case (1): for many archs it's done at the entry of a page fault
    handler, so that it will also cover e.g.  errornous faults.

    Case (2): for some other archs, it is only accounted when the page
    fault is resolved successfully.

    Case (3): there're still quite some archs that have not enabled
    this perf event.

    Since this series will touch merely all the archs, we unify this
    perf event to always follow case (1), which is the one that makes most
    sense.  And since we moved the accounting into handle_mm_fault, the
    other two MAJ/MIN perf events are well taken care of naturally.

  - Unify definition of "major faults": the definition of "major
    fault" is slightly changed when used in accounting (not
    VM_FAULT_MAJOR).  More information in patch 1.

  - Always account the page fault onto the one that triggered the page
    fault.  This does not matter much for #PF handlings, but mostly for
    gup.  More information on this in patch 25.

Patchset layout:

Patch 1:     Introduced the accounting in handle_mm_fault(), not enabled.
Patch 2-23:  Enable the new accounting for arch #PF handlers one by one.
Patch 24:    Enable the new accounting for the rest outliers (gup, iommu, etc.)
Patch 25:    Cleanup GUP task_struct pointer since it's not needed any more

This patch (of 25):

This is a preparation patch to move page fault accountings into the
general code in handle_mm_fault().  This includes both the per task
flt_maj/flt_min counters, and the major/minor page fault perf events.  To
do this, the pt_regs pointer is passed into handle_mm_fault().

PERF_COUNT_SW_PAGE_FAULTS should still be kept in per-arch page fault
handlers.

So far, all the pt_regs pointer that passed into handle_mm_fault() is
NULL, which means this patch should have no intented functional change.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Cain <bcain@codeaurora.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Chris Zankel <chris@zankel.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Cc: Greentime Hu <green.hu@gmail.com>
Cc: Guo Ren <guoren@kernel.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Helge Deller <deller@gmx.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: James E.J. Bottomley <James.Bottomley@HansenPartnership.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Ley Foon Tan <ley.foon.tan@intel.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Nick Hu <nickhu@andestech.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Rich Felker <dalias@libc.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vincent Chen <deanbo422@gmail.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Will Deacon <will@kernel.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Link: http://lkml.kernel.org/r/20200707225021.200906-1-peterx@redhat.com
Link: http://lkml.kernel.org/r/20200707225021.200906-2-peterx@redhat.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/alpha/mm/fault.c b/arch/alpha/mm/fault.c
index c2303a8..1983e43 100644 (file)
--- a/arch/alpha/mm/fault.c
+++ b/arch/alpha/mm/fault.c
@@ -148,7 +148,7 @@ retry:
        /* 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 7287c79..587dea5 100644 (file)
--- a/arch/arc/mm/fault.c
+++ b/arch/arc/mm/fault.c
@@ -130,7 +130,7 @@ retry:
                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 c6550ed..01a8e0f 100644 (file)
--- a/arch/arm/mm/fault.c
+++ b/arch/arm/mm/fault.c
@@ -224,7 +224,7 @@ good_area:
                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 8afb238..be29f40 100644 (file)
--- 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 b1dce9f..b252e6e 100644 (file)
--- a/arch/csky/mm/fault.c
+++ b/arch/csky/mm/fault.c
@@ -150,7 +150,8 @@ good_area:
         * 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 cd3808f..f12f330 100644 (file)
--- a/arch/hexagon/mm/vm_fault.c
+++ b/arch/hexagon/mm/vm_fault.c
@@ -88,7 +88,7 @@ good_area:
                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 3a4dec3..abf2808 100644 (file)
--- a/arch/ia64/mm/fault.c
+++ b/arch/ia64/mm/fault.c
@@ -143,7 +143,7 @@ retry:
         * 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 508abb6..08b35a3 100644 (file)
--- a/arch/m68k/mm/fault.c
+++ b/arch/m68k/mm/fault.c
@@ -134,7 +134,7 @@ good_area:
         * 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 a2bfe58..1a3d4c4 100644 (file)
--- a/arch/microblaze/mm/fault.c
+++ b/arch/microblaze/mm/fault.c
@@ -214,7 +214,7 @@ good_area:
         * 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 01b168a..b1db397 100644 (file)
--- a/arch/mips/mm/fault.c
+++ b/arch/mips/mm/fault.c
@@ -152,7 +152,7 @@ good_area:
         * 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 8fb73f6..d0ecc8f 100644 (file)
--- a/arch/nds32/mm/fault.c
+++ b/arch/nds32/mm/fault.c
@@ -206,7 +206,7 @@ good_area:
         * 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 4112ef0..86beb9a 100644 (file)
--- a/arch/nios2/mm/fault.c
+++ b/arch/nios2/mm/fault.c
@@ -131,7 +131,7 @@ good_area:
         * 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 d2224cc..3daa491 100644 (file)
--- a/arch/openrisc/mm/fault.c
+++ b/arch/openrisc/mm/fault.c
@@ -159,7 +159,7 @@ good_area:
         * 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 66ac071..e32d069 100644 (file)
--- a/arch/parisc/mm/fault.c
+++ b/arch/parisc/mm/fault.c
@@ -302,7 +302,7 @@ good_area:
         * 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 b83abbe..2d0276a 100644 (file)
--- 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 925a723..c6a5225 100644 (file)
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -511,7 +511,7 @@ retry:
         * 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 5873835..30c1124 100644 (file)
--- a/arch/riscv/mm/fault.c
+++ b/arch/riscv/mm/fault.c
@@ -109,7 +109,7 @@ good_area:
         * 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 aebf918..ad783aa 100644 (file)
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -476,7 +476,7 @@ retry:
         * 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 fbe1f2f..3c0a118 100644 (file)
--- a/arch/sh/mm/fault.c
+++ b/arch/sh/mm/fault.c
@@ -482,7 +482,7 @@ good_area:
         * 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 cfef656..06af03d 100644 (file)
--- a/arch/sparc/mm/fault_32.c
+++ b/arch/sparc/mm/fault_32.c
@@ -234,7 +234,7 @@ good_area:
         * 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 @@ good_area:
                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 a380661..9ebee14 100644 (file)
--- a/arch/sparc/mm/fault_64.c
+++ b/arch/sparc/mm/fault_64.c
@@ -422,7 +422,7 @@ good_area:
                        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 2b3afa3..8d9870d 100644 (file)
--- a/arch/um/kernel/trap.c
+++ b/arch/um/kernel/trap.c
@@ -71,7 +71,7 @@ good_area:
        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 0c7643d..e1bf555 100644 (file)
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -1291,7 +1291,7 @@ good_area:
         * 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 c128dcc..e72c8c1 100644 (file)
--- a/arch/xtensa/mm/fault.c
+++ b/arch/xtensa/mm/fault.c
@@ -107,7 +107,7 @@ good_area:
         * 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 e4b025c..c259108 100644 (file)
--- 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 6c87c80..5ae59a6 100644 (file)
--- 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 f97b101..ec0ffb4 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -38,6 +38,7 @@ struct file_ra_state;
 struct user_struct;
 struct writeback_control;
 struct bdi_writeback;
+struct pt_regs;
 
 void init_mm_internals(void);
 
@@ -1658,7 +1659,8 @@ 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);
@@ -1668,7 +1670,8 @@ 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 e9d1d0c..ae7121d 100644 (file)
--- 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 @@ retry:
            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 bb27931..943cb2b 100644 (file)
--- 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 217842a..0aa2247 100644 (file)
--- 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 325bb57..9b7d357 100644 (file)
--- 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>
 
@@ -4356,6 +4358,64 @@ retry_pud:
        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
  *
@@ -4363,7 +4423,7 @@ retry_pud:
  * 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;
 
@@ -4404,6 +4464,8 @@ 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);