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| author | Peter Xu <peterx@redhat.com> | 2020-08-11 18:38:12 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-08-12 10:58:03 -0700 |
| commit | aeb6aefc3129307858e4d5a4b73ae28f1871ae05 (patch) | |
| tree | b0f1acfc3cc33b4a1cad02815f691345df410968 /arch | |
| parent | e1c17f627b4232e2c7e9edb7151fa60a746150ee (diff) | |
| download | lwn-aeb6aefc3129307858e4d5a4b73ae28f1871ae05.tar.gz lwn-aeb6aefc3129307858e4d5a4b73ae28f1871ae05.zip | |
mm/microblaze: 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.
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().
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Simek <monstr@monstr.eu>
Link: http://lkml.kernel.org/r/20200707225021.200906-11-peterx@redhat.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/microblaze/mm/fault.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/arch/microblaze/mm/fault.c b/arch/microblaze/mm/fault.c index 1a3d4c4ca28b..b3fed2cecf84 100644 --- a/arch/microblaze/mm/fault.c +++ b/arch/microblaze/mm/fault.c @@ -28,6 +28,7 @@ #include <linux/mman.h> #include <linux/mm.h> #include <linux/interrupt.h> +#include <linux/perf_event.h> #include <asm/page.h> #include <asm/mmu.h> @@ -121,6 +122,8 @@ void do_page_fault(struct pt_regs *regs, unsigned long address, if (user_mode(regs)) flags |= FAULT_FLAG_USER; + perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address); + /* When running in the kernel we expect faults to occur only to * addresses in user space. All other faults represent errors in the * kernel and should generate an OOPS. Unfortunately, in the case of an @@ -214,7 +217,7 @@ good_area: * 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); if (fault_signal_pending(fault, regs)) return; @@ -230,10 +233,6 @@ good_area: } if (flags & FAULT_FLAG_ALLOW_RETRY) { - if (unlikely(fault & VM_FAULT_MAJOR)) - current->maj_flt++; - else - current->min_flt++; if (fault & VM_FAULT_RETRY) { flags |= FAULT_FLAG_TRIED; |