From: Peter Xu <peterx@xxxxxxxxxx> Subject: mm/ia64: use general page fault accounting 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(). Link: http://lkml.kernel.org/r/20200707225021.200906-9-peterx@xxxxxxxxxx Signed-off-by: Peter Xu <peterx@xxxxxxxxxx> Cc: "Luck, Tony" <tony.luck@xxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- arch/ia64/mm/fault.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) --- a/arch/ia64/mm/fault.c~mm-ia64-use-general-page-fault-accounting +++ a/arch/ia64/mm/fault.c @@ -14,6 +14,7 @@ #include <linux/kdebug.h> #include <linux/prefetch.h> #include <linux/uaccess.h> +#include <linux/perf_event.h> #include <asm/processor.h> #include <asm/exception.h> @@ -105,6 +106,8 @@ ia64_do_page_fault (unsigned long addres flags |= FAULT_FLAG_USER; if (mask & VM_WRITE) flags |= FAULT_FLAG_WRITE; + + perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address); retry: mmap_read_lock(mm); @@ -143,7 +146,7 @@ retry: * sure we exit gracefully rather than endlessly redo the * fault. */ - fault = handle_mm_fault(vma, address, flags, NULL); + fault = handle_mm_fault(vma, address, flags, regs); if (fault_signal_pending(fault, regs)) return; @@ -166,10 +169,6 @@ retry: } if (flags & FAULT_FLAG_ALLOW_RETRY) { - if (fault & VM_FAULT_MAJOR) - current->maj_flt++; - else - current->min_flt++; if (fault & VM_FAULT_RETRY) { flags |= FAULT_FLAG_TRIED; _
