Use the general page fault accounting by passing regs into handle_mm_fault(). It naturally solve the issue of multiple page fault accounting when page fault retry happened.
Add the missing PERF_COUNT_SW_PAGE_FAULTS perf events too. Note, the other two perf events (PERF_COUNT_SW_PAGE_FAULTS_[MAJ|MIN]) were done in handle_mm_fault(). CC: Guan Xuetao <[email protected]> Signed-off-by: Peter Xu <[email protected]> --- arch/unicore32/mm/fault.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/arch/unicore32/mm/fault.c b/arch/unicore32/mm/fault.c index 847ff24fcc2a..b272a389d977 100644 --- a/arch/unicore32/mm/fault.c +++ b/arch/unicore32/mm/fault.c @@ -16,6 +16,7 @@ #include <linux/page-flags.h> #include <linux/sched/signal.h> #include <linux/io.h> +#include <linux/perf_event.h> #include <asm/pgtable.h> #include <asm/tlbflush.h> @@ -160,7 +161,8 @@ static inline bool access_error(unsigned int fsr, struct vm_area_struct *vma) } static vm_fault_t __do_pf(struct mm_struct *mm, unsigned long addr, - unsigned int fsr, unsigned int flags, struct task_struct *tsk) + unsigned int fsr, unsigned int flags, + struct task_struct *tsk, struct pt_regs *regs) { struct vm_area_struct *vma; vm_fault_t fault; @@ -186,7 +188,7 @@ static vm_fault_t __do_pf(struct mm_struct *mm, unsigned long addr, * 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, addr & PAGE_MASK, flags, NULL); + fault = handle_mm_fault(vma, addr & PAGE_MASK, flags, regs); return fault; check_stack: @@ -219,6 +221,8 @@ static int do_pf(unsigned long addr, unsigned int fsr, struct pt_regs *regs) if (!(fsr ^ 0x12)) flags |= FAULT_FLAG_WRITE; + perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, addr); + /* * As per x86, we may deadlock here. However, since the kernel only * validly references user space from well defined areas of the code, @@ -244,7 +248,7 @@ static int do_pf(unsigned long addr, unsigned int fsr, struct pt_regs *regs) #endif } - fault = __do_pf(mm, addr, fsr, flags, tsk); + fault = __do_pf(mm, addr, fsr, flags, tsk, regs); /* If we need to retry but a fatal signal is pending, handle the * signal first. We do not need to release the mmap_sem because @@ -254,10 +258,6 @@ static int do_pf(unsigned long addr, unsigned int fsr, struct pt_regs *regs) return 0; if (!(fault & VM_FAULT_ERROR) && (flags & FAULT_FLAG_ALLOW_RETRY)) { - if (fault & VM_FAULT_MAJOR) - tsk->maj_flt++; - else - tsk->min_flt++; if (fault & VM_FAULT_RETRY) { flags |= FAULT_FLAG_TRIED; goto retry; -- 2.26.2
