[PATCH 07/26] mm/hexagon: Use general page fault accounting

Peter Xu
2020-06-19T16:07:35Z

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().

CC: Brian Cain <bcain@codeaurora.org>
CC: linux-hexagon@vger.kernel.org
Signed-off-by: Peter Xu <peterx@redhat.com>
---
arch/hexagon/mm/vm_fault.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/arch/hexagon/mm/vm_fault.c b/arch/hexagon/mm/vm_fault.c
index f04cd0a6d905..1b1802f30862 100644
--- a/arch/hexagon/mm/vm_fault.c
+++ b/arch/hexagon/mm/vm_fault.c
@@ -19,6 +19,7 @@
#include <linux/signal.h>
#include <linux/extable.h>
#include <linux/hardirq.h>
+#include <linux/perf_event.h>

/*
* Decode of hardware exception sends us to one of several
@@ -54,6 +55,8 @@ void do_page_fault(unsigned long address, long cause, struct pt_regs *regs)

if (user_mode(regs))
flags |= FAULT_FLAG_USER;
+
+ perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
retry:
down_read(&mm->mmap_sem);
vma = find_vma(mm, address);
@@ -89,7 +92,7 @@ void do_page_fault(unsigned long address, long cause, struct pt_regs *regs)
break;
}

- fault = handle_mm_fault(vma, address, flags, NULL);
+ fault = handle_mm_fault(vma, address, flags, regs);

if (fault_signal_pending(fault, regs))
return;
@@ -97,10 +100,6 @@ void do_page_fault(unsigned long address, long cause, struct pt_regs *regs)
/* The most common case -- we are done. */
if (likely(!(fault & VM_FAULT_ERROR))) {
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;
goto retry;
--
2.26.2