Add tracepoints to dax_pfn_mkwrite(), following the same logging conventions as the rest of DAX.
Here is an example PTE fault followed by a pfn_mkwrite: small_aligned-1094 [002] .... 374.084998: dax_pte_fault: dev 259:0 ino 0x1003 shared WRITE|ALLOW_RETRY|KILLABLE|USER address 0x10400000 pgoff 0x200 small_aligned-1094 [002] .... 374.085145: dax_pte_fault_done: dev 259:0 ino 0x1003 shared WRITE|ALLOW_RETRY|KILLABLE|USER address 0x10400000 pgoff 0x200 MAJOR|NOPAGE small_aligned-1094 [002] .... 374.085165: dax_pfn_mkwrite: dev 259:0 ino 0x1003 shared WRITE|MKWRITE|ALLOW_RETRY|KILLABLE|USER address 0x10400000 pgoff 0x200 NOPAGE Signed-off-by: Ross Zwisler <[email protected]> --- fs/dax.c | 3 +++ include/trace/events/fs_dax.h | 2 ++ 2 files changed, 5 insertions(+) diff --git a/fs/dax.c b/fs/dax.c index bf70d4d..b52732fb 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -931,6 +931,7 @@ int dax_pfn_mkwrite(struct vm_fault *vmf) { struct file *file = vmf->vma->vm_file; struct address_space *mapping = file->f_mapping; + struct inode *inode = mapping->host; void *entry, **slot; pgoff_t index = vmf->pgoff; @@ -940,6 +941,7 @@ int dax_pfn_mkwrite(struct vm_fault *vmf) if (entry) put_unlocked_mapping_entry(mapping, index, entry); spin_unlock_irq(&mapping->tree_lock); + trace_dax_pfn_mkwrite_no_entry(inode, vmf, VM_FAULT_NOPAGE); return VM_FAULT_NOPAGE; } radix_tree_tag_set(&mapping->page_tree, index, PAGECACHE_TAG_DIRTY); @@ -952,6 +954,7 @@ int dax_pfn_mkwrite(struct vm_fault *vmf) */ finish_mkwrite_fault(vmf); put_locked_mapping_entry(mapping, index, entry); + trace_dax_pfn_mkwrite(inode, vmf, VM_FAULT_NOPAGE); return VM_FAULT_NOPAGE; } EXPORT_SYMBOL_GPL(dax_pfn_mkwrite); diff --git a/include/trace/events/fs_dax.h b/include/trace/events/fs_dax.h index cbcd7d6..b5a5209 100644 --- a/include/trace/events/fs_dax.h +++ b/include/trace/events/fs_dax.h @@ -190,6 +190,8 @@ DEFINE_EVENT(dax_pte_fault_class, name, \ DEFINE_PTE_FAULT_EVENT(dax_pte_fault); DEFINE_PTE_FAULT_EVENT(dax_pte_fault_done); +DEFINE_PTE_FAULT_EVENT(dax_pfn_mkwrite_no_entry); +DEFINE_PTE_FAULT_EVENT(dax_pfn_mkwrite); #endif /* _TRACE_FS_DAX_H */ -- 2.9.3
