Provide this helper for doing memory page fault accounting across archs. It can be defined unconditionally because perf_sw_event() is always defined, and perf_sw_event() will be a no-op if !CONFIG_PERF_EVENTS.
Signed-off-by: Peter Xu <[email protected]> --- include/linux/mm.h | 2 ++ mm/memory.c | 18 ++++++++++++++++++ 2 files changed, 20 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index f3fe7371855c..b96db64125be 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1649,6 +1649,8 @@ void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end); int truncate_inode_page(struct address_space *mapping, struct page *page); int generic_error_remove_page(struct address_space *mapping, struct page *page); int invalidate_inode_page(struct page *page); +void mm_fault_accounting(struct task_struct *task, struct pt_regs *regs, + unsigned long address, bool major); #ifdef CONFIG_MMU extern vm_fault_t handle_mm_fault(struct vm_area_struct *vma, diff --git a/mm/memory.c b/mm/memory.c index f703fe8c8346..c4f8319f0ed8 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -71,6 +71,8 @@ #include <linux/dax.h> #include <linux/oom.h> #include <linux/numa.h> +#include <linux/perf_event.h> +#include <linux/ptrace.h> #include <trace/events/kmem.h> @@ -4397,6 +4399,22 @@ vm_fault_t handle_mm_fault(struct vm_area_struct *vma, unsigned long address, } EXPORT_SYMBOL_GPL(handle_mm_fault); +void mm_fault_accounting(struct task_struct *task, struct pt_regs *regs, + unsigned long address, bool major) +{ + perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address); + if (major) { + task->maj_flt++; + perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, + regs, address); + } else { + task->min_flt++; + perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, + regs, address); + } +} +EXPORT_SYMBOL_GPL(mm_fault_accounting); + #ifndef __PAGETABLE_P4D_FOLDED /* * Allocate p4d page table. -- 2.26.2
