The patch titled
Subject: dax: add tracepoints to dax_pfn_mkwrite()
has been added to the -mm tree. Its filename is
dax-add-tracepoints-to-dax_pfn_mkwrite.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/dax-add-tracepoints-to-dax_pfn_mkwrite.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/dax-add-tracepoints-to-dax_pfn_mkwrite.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Subject: dax: add tracepoints to dax_pfn_mkwrite()
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
Link: http://lkml.kernel.org/r/20170221195116.13278-3-ross.zwisler@xxxxxxxxxxxxxxx
Signed-off-by: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Reviewed-by: Jan Kara <jack@xxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/dax.c | 3 +++
include/trace/events/fs_dax.h | 2 ++
2 files changed, 5 insertions(+)
diff -puN fs/dax.c~dax-add-tracepoints-to-dax_pfn_mkwrite fs/dax.c
--- a/fs/dax.c~dax-add-tracepoints-to-dax_pfn_mkwrite
+++ a/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 -puN include/trace/events/fs_dax.h~dax-add-tracepoints-to-dax_pfn_mkwrite include/trace/events/fs_dax.h
--- a/include/trace/events/fs_dax.h~dax-add-tracepoints-to-dax_pfn_mkwrite
+++ a/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 */
_
Patches currently in -mm which might be from ross.zwisler@xxxxxxxxxxxxxxx are
dax-add-tracepoints-to-dax_iomap_pte_fault.patch
dax-add-tracepoints-to-dax_pfn_mkwrite.patch
dax-add-tracepoints-to-dax_load_hole.patch
dax-add-tracepoints-to-dax_writeback_mapping_range.patch
dax-add-tracepoint-to-dax_writeback_one.patch
dax-add-tracepoint-to-dax_insert_mapping.patch
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