linux-kernel - [PATCH 17/25] mm/powerpc: Use mm_fault

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Date:   Mon, 15 Jun 2020 18:15:59 -0400
From:   Peter Xu <peterx@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Gerald Schaefer <gerald.schaefer@...ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>, peterx@...hat.com,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH 17/25] mm/powerpc: Use mm_fault_accounting()

Use the new mm_fault_accounting() helper for page fault accounting.

cmo_account_page_fault() is special.  Keep that.

CC: Michael Ellerman <mpe@...erman.id.au>
CC: Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC: Paul Mackerras <paulus@...ba.org>
CC: linuxppc-dev@...ts.ozlabs.org
Signed-off-by: Peter Xu <peterx@...hat.com>
---
 arch/powerpc/mm/fault.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index 84af6c8eecf7..6043b639ae42 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -481,8 +481,6 @@ static int __do_page_fault(struct pt_regs *regs, unsigned long address,
 	if (!arch_irq_disabled_regs(regs))
 		local_irq_enable();
 
-	perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
-
 	if (error_code & DSISR_KEYFAULT)
 		return bad_key_fault_exception(regs, address,
 					       get_mm_addr_key(mm, address));
@@ -604,14 +602,11 @@ static int __do_page_fault(struct pt_regs *regs, unsigned long address,
 	/*
 	 * Major/minor page fault accounting.
 	 */
-	if (major) {
-		current->maj_flt++;
-		perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, regs, address);
+	if (major)
 		cmo_account_page_fault();
-	} else {
-		current->min_flt++;
-		perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, regs, address);
-	}
+
+	mm_fault_accounting(current, regs, address, major);
+
 	return 0;
 }
 NOKPROBE_SYMBOL(__do_page_fault);
-- 
2.26.2