The patch titled
Subject: dax: add tracepoint to dax_insert_mapping()
has been added to the -mm tree. Its filename is
dax-add-tracepoint-to-dax_insert_mapping.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/dax-add-tracepoint-to-dax_insert_mapping.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/dax-add-tracepoint-to-dax_insert_mapping.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
there every 3-4 working days
------------------------------------------------------
From: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Subject: dax: add tracepoint to dax_insert_mapping()
Add a tracepoint to dax_insert_mapping(), following the same logging
conventions as the rest of DAX. This tracepoint, along with the one in
dax_load_hole(), lets us know how a DAX PTE fault was serviced.
Here is an example DAX fault that inserts a PTE mapping:
small-1126 [007] .... 145.451604: dax_pte_fault: dev 259:0 ino 0x1003
shared WRITE|ALLOW_RETRY|KILLABLE|USER address 0x10420000 pgoff 0x220
small-1126 [007] .... 145.452317: dax_insert_mapping: dev 259:0 ino
0x1003 shared write address 0x10420000 radix_entry 0x100006
small-1126 [007] .... 145.452399: dax_pte_fault_done: dev 259:0 ino
0x1003 shared WRITE|ALLOW_RETRY|KILLABLE|USER address 0x10420000 pgoff
0x220 MAJOR|NOPAGE
Link: http://lkml.kernel.org/r/20170221195116.13278-7-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 | 1 +
include/trace/events/fs_dax.h | 30 ++++++++++++++++++++++++++++++
2 files changed, 31 insertions(+)
diff -puN fs/dax.c~dax-add-tracepoint-to-dax_insert_mapping fs/dax.c
--- a/fs/dax.c~dax-add-tracepoint-to-dax_insert_mapping
+++ a/fs/dax.c
@@ -931,6 +931,7 @@ static int dax_insert_mapping(struct add
return PTR_ERR(ret);
*entryp = ret;
+ trace_dax_insert_mapping(mapping->host, vmf, ret);
return vm_insert_mixed(vma, vaddr, dax.pfn);
}
diff -puN include/trace/events/fs_dax.h~dax-add-tracepoint-to-dax_insert_mapping include/trace/events/fs_dax.h
--- a/include/trace/events/fs_dax.h~dax-add-tracepoint-to-dax_insert_mapping
+++ a/include/trace/events/fs_dax.h
@@ -194,6 +194,36 @@ DEFINE_PTE_FAULT_EVENT(dax_pfn_mkwrite_n
DEFINE_PTE_FAULT_EVENT(dax_pfn_mkwrite);
DEFINE_PTE_FAULT_EVENT(dax_load_hole);
+TRACE_EVENT(dax_insert_mapping,
+ TP_PROTO(struct inode *inode, struct vm_fault *vmf, void *radix_entry),
+ TP_ARGS(inode, vmf, radix_entry),
+ TP_STRUCT__entry(
+ __field(unsigned long, ino)
+ __field(unsigned long, vm_flags)
+ __field(unsigned long, address)
+ __field(void *, radix_entry)
+ __field(dev_t, dev)
+ __field(int, write)
+ ),
+ TP_fast_assign(
+ __entry->dev = inode->i_sb->s_dev;
+ __entry->ino = inode->i_ino;
+ __entry->vm_flags = vmf->vma->vm_flags;
+ __entry->address = vmf->address;
+ __entry->write = vmf->flags & FAULT_FLAG_WRITE;
+ __entry->radix_entry = radix_entry;
+ ),
+ TP_printk("dev %d:%d ino %#lx %s %s address %#lx radix_entry %#lx",
+ MAJOR(__entry->dev),
+ MINOR(__entry->dev),
+ __entry->ino,
+ __entry->vm_flags & VM_SHARED ? "shared" : "private",
+ __entry->write ? "write" : "read",
+ __entry->address,
+ (unsigned long)__entry->radix_entry
+ )
+)
+
DECLARE_EVENT_CLASS(dax_writeback_range_class,
TP_PROTO(struct inode *inode, pgoff_t start_index, pgoff_t end_index),
TP_ARGS(inode, start_index, end_index),
_
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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