mm/nds32: use general page fault accounting
authorPeter Xu <peterx@redhat.com>
Wed, 12 Aug 2020 01:38:19 +0000 (18:38 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 12 Aug 2020 17:58:03 +0000 (10:58 -0700)
commitdaf7bf5d90397bc0f3d7b45030461f55eb9c74fa
tree049f109ff05ef4539e32107743684ee037854903
parent2558fd7f5c3eda31d4474c7cdc8dc4b3bb6526f5
mm/nds32: 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>
Acked-by: Greentime Hu <green.hu@gmail.com>
Cc: Nick Hu <nickhu@andestech.com>
Cc: Vincent Chen <deanbo422@gmail.com>
Link: http://lkml.kernel.org/r/20200707225021.200906-13-peterx@redhat.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
arch/nds32/mm/fault.c