linux-kernel - [PATCH 16/26] mm/powerpc: Use general page fault accounting

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Message-Id: <20200619161327.9564-1-peterx@redhat.com>
Date:   Fri, 19 Jun 2020 12:13:27 -0400
From:   Peter Xu <peterx@...hat.com>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     Peter Xu <peterx@...hat.com>,
        Gerald Schaefer <gerald.schaefer@...ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Will Deacon <will@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH 16/26] mm/powerpc: Use general page fault accounting

Use the general page fault accounting by passing regs into handle_mm_fault().

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 | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index 992b10c3761c..e325d13efaf5 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -563,7 +563,7 @@ static int __do_page_fault(struct pt_regs *regs, unsigned long address,
 	 * make 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);
 
 #ifdef CONFIG_PPC_MEM_KEYS
 	/*
@@ -604,14 +604,9 @@ 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);
-	}
+
 	return 0;
 }
 NOKPROBE_SYMBOL(__do_page_fault);
-- 
2.26.2