diff options
| -rw-r--r-- | fs/dax.c | 14 | ||||
| -rw-r--r-- | include/trace/events/fs_dax.h | 42 |
2 files changed, 52 insertions, 4 deletions
@@ -1299,33 +1299,39 @@ static int dax_pmd_load_hole(struct vm_area_struct *vma, pmd_t *pmd, { struct address_space *mapping = vma->vm_file->f_mapping; unsigned long pmd_addr = address & PMD_MASK; + struct inode *inode = mapping->host; struct page *zero_page; + void *ret = NULL; spinlock_t *ptl; pmd_t pmd_entry; - void *ret; zero_page = mm_get_huge_zero_page(vma->vm_mm); if (unlikely(!zero_page)) - return VM_FAULT_FALLBACK; + goto fallback; ret = dax_insert_mapping_entry(mapping, vmf, *entryp, 0, RADIX_DAX_PMD | RADIX_DAX_HZP); if (IS_ERR(ret)) - return VM_FAULT_FALLBACK; + goto fallback; *entryp = ret; ptl = pmd_lock(vma->vm_mm, pmd); if (!pmd_none(*pmd)) { spin_unlock(ptl); - return VM_FAULT_FALLBACK; + goto fallback; } pmd_entry = mk_pmd(zero_page, vma->vm_page_prot); pmd_entry = pmd_mkhuge(pmd_entry); set_pmd_at(vma->vm_mm, pmd_addr, pmd, pmd_entry); spin_unlock(ptl); + trace_dax_pmd_load_hole(inode, vma, address, zero_page, ret); return VM_FAULT_NOPAGE; + +fallback: + trace_dax_pmd_load_hole_fallback(inode, vma, address, zero_page, ret); + return VM_FAULT_FALLBACK; } int dax_iomap_pmd_fault(struct vm_area_struct *vma, unsigned long address, diff --git a/include/trace/events/fs_dax.h b/include/trace/events/fs_dax.h index 58b0b5612683..43f1263131a4 100644 --- a/include/trace/events/fs_dax.h +++ b/include/trace/events/fs_dax.h @@ -61,6 +61,48 @@ DEFINE_EVENT(dax_pmd_fault_class, name, \ DEFINE_PMD_FAULT_EVENT(dax_pmd_fault); DEFINE_PMD_FAULT_EVENT(dax_pmd_fault_done); +DECLARE_EVENT_CLASS(dax_pmd_load_hole_class, + TP_PROTO(struct inode *inode, struct vm_area_struct *vma, + unsigned long address, struct page *zero_page, + void *radix_entry), + TP_ARGS(inode, vma, address, zero_page, radix_entry), + TP_STRUCT__entry( + __field(unsigned long, ino) + __field(unsigned long, vm_flags) + __field(unsigned long, address) + __field(struct page *, zero_page) + __field(void *, radix_entry) + __field(dev_t, dev) + ), + TP_fast_assign( + __entry->dev = inode->i_sb->s_dev; + __entry->ino = inode->i_ino; + __entry->vm_flags = vma->vm_flags; + __entry->address = address; + __entry->zero_page = zero_page; + __entry->radix_entry = radix_entry; + ), + TP_printk("dev %d:%d ino %#lx %s address %#lx zero_page %p " + "radix_entry %#lx", + MAJOR(__entry->dev), + MINOR(__entry->dev), + __entry->ino, + __entry->vm_flags & VM_SHARED ? "shared" : "private", + __entry->address, + __entry->zero_page, + (unsigned long)__entry->radix_entry + ) +) + +#define DEFINE_PMD_LOAD_HOLE_EVENT(name) \ +DEFINE_EVENT(dax_pmd_load_hole_class, name, \ + TP_PROTO(struct inode *inode, struct vm_area_struct *vma, \ + unsigned long address, struct page *zero_page, \ + void *radix_entry), \ + TP_ARGS(inode, vma, address, zero_page, radix_entry)) + +DEFINE_PMD_LOAD_HOLE_EVENT(dax_pmd_load_hole); +DEFINE_PMD_LOAD_HOLE_EVENT(dax_pmd_load_hole_fallback); #endif /* _TRACE_FS_DAX_H */ |