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authorPeter Xu <peterx@redhat.com>2020-08-12 04:37:52 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2020-08-12 20:58:03 +0300
commit52e3f8d03052036ce97296915a3746421a1da1d0 (patch)
tree5837cbd1269f835935bdcedb8f6f8caeaba6e3bf /arch/arc
parentc0f6eda41f97dbe4e4feda914c18d019b9b9fccd (diff)
downloadlinux-52e3f8d03052036ce97296915a3746421a1da1d0.tar.xz
mm/arc: use general page fault accounting
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>
Diffstat (limited to 'arch/arc')
-rw-r--r--arch/arc/mm/fault.c18
1 files changed, 3 insertions, 15 deletions
diff --git a/arch/arc/mm/fault.c b/arch/arc/mm/fault.c
index 587dea524e6b..f5657cb68e4f 100644
--- a/arch/arc/mm/fault.c
+++ b/arch/arc/mm/fault.c
@@ -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 @@ retry:
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 @@ bad_area:
* 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;