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* [PATCH v4 06/26] mm/csky: Use general page fault accounting
@ 2020-06-30 20:45 Peter Xu
  2020-07-01  1:52 ` Guo Ren
  0 siblings, 1 reply; 2+ messages in thread
From: Peter Xu @ 2020-06-30 20:45 UTC (permalink / raw)
  To: linux-mm, linux-kernel
  Cc: Andrew Morton, peterx, John Hubbard, Michael Ellerman,
	Gerald Schaefer, Andrea Arcangeli, Linus Torvalds, Will Deacon,
	Guo Ren, linux-csky

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.

CC: Guo Ren <guoren@kernel.org>
CC: linux-csky@vger.kernel.org
Signed-off-by: Peter Xu <peterx@redhat.com>
---
 arch/csky/mm/fault.c | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/arch/csky/mm/fault.c b/arch/csky/mm/fault.c
index 7137e2e8dc57..c3f580714ee4 100644
--- a/arch/csky/mm/fault.c
+++ b/arch/csky/mm/fault.c
@@ -151,7 +151,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
 	 * the fault.
 	 */
 	fault = handle_mm_fault(vma, address, write ? FAULT_FLAG_WRITE : 0,
-				NULL);
+				regs);
 	if (unlikely(fault & VM_FAULT_ERROR)) {
 		if (fault & VM_FAULT_OOM)
 			goto out_of_memory;
@@ -161,16 +161,6 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
 			goto bad_area;
 		BUG();
 	}
-	if (fault & VM_FAULT_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);
-	}
-
 	mmap_read_unlock(mm);
 	return;
 
-- 
2.26.2


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2020-06-30 20:45 [PATCH v4 06/26] mm/csky: Use general page fault accounting Peter Xu
2020-07-01  1:52 ` Guo Ren

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