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| author | Peter Xu <peterx@redhat.com> | 2020-08-11 18:38:09 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-08-12 10:58:03 -0700 |
| commit | e1c17f627b4232e2c7e9edb7151fa60a746150ee (patch) | |
| tree | 5902752639aa006be559fcef3b18d272d8cce015 | |
| parent | b444eed891cf8656af1f59d239f77c5338481774 (diff) | |
| download | lwn-e1c17f627b4232e2c7e9edb7151fa60a746150ee.tar.gz lwn-e1c17f627b4232e2c7e9edb7151fa60a746150ee.zip | |
mm/m68k: 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: Geert Uytterhoeven <geert@linux-m68k.org>
Link: http://lkml.kernel.org/r/20200707225021.200906-10-peterx@redhat.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | arch/m68k/mm/fault.c | 14 |
1 files changed, 4 insertions, 10 deletions
diff --git a/arch/m68k/mm/fault.c b/arch/m68k/mm/fault.c index 08b35a318ebe..795f483b1050 100644 --- a/arch/m68k/mm/fault.c +++ b/arch/m68k/mm/fault.c @@ -12,6 +12,7 @@ #include <linux/interrupt.h> #include <linux/module.h> #include <linux/uaccess.h> +#include <linux/perf_event.h> #include <asm/setup.h> #include <asm/traps.h> @@ -84,6 +85,8 @@ int 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); retry: mmap_read_lock(mm); @@ -134,7 +137,7 @@ good_area: * the fault. */ - fault = handle_mm_fault(vma, address, flags, NULL); + fault = handle_mm_fault(vma, address, flags, regs); pr_debug("handle_mm_fault returns %x\n", fault); if (fault_signal_pending(fault, regs)) @@ -150,16 +153,7 @@ good_area: BUG(); } - /* - * Major/minor page fault accounting is only done on the - * initial attempt. If we go through a retry, it is extremely - * likely that the page will be found in page cache at that point. - */ 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; |