The patch titled
Subject: mm/nios2: use general page fault accounting
has been removed from the -mm tree. Its filename was
mm-nios2-use-general-page-fault-accounting.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Peter Xu <peterx@xxxxxxxxxx>
Subject: mm/nios2: 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().
Link: http://lkml.kernel.org/r/20200707225021.200906-14-peterx@xxxxxxxxxx
Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
Cc: Ley Foon Tan <ley.foon.tan@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/nios2/mm/fault.c | 14 ++++----------
1 file changed, 4 insertions(+), 10 deletions(-)
--- a/arch/nios2/mm/fault.c~mm-nios2-use-general-page-fault-accounting
+++ a/arch/nios2/mm/fault.c
@@ -24,6 +24,7 @@
#include <linux/mm.h>
#include <linux/extable.h>
#include <linux/uaccess.h>
+#include <linux/perf_event.h>
#include <asm/mmu_context.h>
#include <asm/traps.h>
@@ -83,6 +84,8 @@ asmlinkage void do_page_fault(struct pt_
if (user_mode(regs))
flags |= FAULT_FLAG_USER;
+ perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
+
if (!mmap_read_trylock(mm)) {
if (!user_mode(regs) && !search_exception_tables(regs->ea))
goto bad_area_nosemaphore;
@@ -131,7 +134,7 @@ 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;
@@ -146,16 +149,7 @@ 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;
_
Patches currently in -mm which might be from peterx@xxxxxxxxxx are
