[PATCH 23/26] mm/x86: Use general page fault accounting

Peter Xu
2020-06-19T16:14:21Z

CC: Dave Hansen <dave.hansen@linux.intel.com>
CC: Andy Lutomirski <luto@kernel.org>
CC: Peter Zijlstra <peterz@infradead.org>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: Ingo Molnar <mingo@redhat.com>
CC: Borislav Petkov <bp@alien8.de>
CC: x86@kernel.org
CC: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
---
arch/x86/mm/fault.c | 17 ++---------------
1 file changed, 2 insertions(+), 15 deletions(-)

diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 3e27ed85af06..4604755a303d 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -1309,7 +1309,7 @@ void do_user_addr_fault(struct pt_regs *regs,
struct vm_area_struct *vma;
struct task_struct *tsk;
struct mm_struct *mm;
- vm_fault_t fault, major = 0;
+ vm_fault_t fault;
unsigned int flags = FAULT_FLAG_DEFAULT;

tsk = current;
@@ -1461,8 +1461,7 @@ 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, NULL);
- major |= fault & VM_FAULT_MAJOR;
+ fault = handle_mm_fault(vma, address, flags, regs);

/* Quick path to respond to signals */
if (fault_signal_pending(fault, regs)) {
@@ -1489,18 +1488,6 @@ void do_user_addr_fault(struct pt_regs *regs,
return;
}

- /*
- * Major/minor page fault accounting. If any of the events
- * returned VM_FAULT_MAJOR, we account it as a major fault.
- */
- if (major) {
- tsk->maj_flt++;
- perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, regs, address);
- } else {
- tsk->min_flt++;
- perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, regs, address);
- }
-
check_v8086_mode(regs, address, tsk);
}
NOKPROBE_SYMBOL(do_user_addr_fault);
--
2.26.2