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mm/arc: use general page fault accounting

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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.

Fix PERF_COUNT_SW_PAGE_FAULTS perf event manually for page fault retries,
by moving it before taking mmap_sem.

Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Vineet Gupta <vgupta@synopsys.com>
Link: http://lkml.kernel.org/r/20200707225021.200906-4-peterx@redhat.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Peter Xu 2020-08-11 18:37:52 -07:00 committed by Linus Torvalds
parent c0f6eda41f
commit 52e3f8d030
1 changed files with 3 additions and 15 deletions
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18
arch/arc/mm/fault.c
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@ -105,6 +105,7 @@ void do_page_fault(unsigned long address, struct pt_regs *regs)
if (write)
flags |= FAULT_FLAG_WRITE;
perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
retry:
mmap_read_lock(mm);
@ -130,7 +131,7 @@ void do_page_fault(unsigned long address, struct pt_regs *regs)
goto bad_area;
}
fault = handle_mm_fault(vma, address, flags, NULL);
fault = handle_mm_fault(vma, address, flags, regs);
/* Quick path to respond to signals */
if (fault_signal_pending(fault, regs)) {
@ -155,22 +156,9 @@ void do_page_fault(unsigned long address, struct pt_regs *regs)
* Major/minor page fault accounting
* (in case of retry we only land here once)
*/
perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
if (likely(!(fault & VM_FAULT_ERROR))) {
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);
}
if (likely(!(fault & VM_FAULT_ERROR)))
/* Normal return path: fault Handled Gracefully */
return;
}
if (!user_mode(regs))
goto no_context;