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dax: add tracepoints to dax_writeback_mapping_range() 

Add tracepoints to dax_writeback_mapping_range(), following the same
logging conventions as the rest of DAX.

Here is an example writeback call:

  msync-1085  [006] ....
   200.902565: dax_writeback_range: dev 259:0 ino 0x1003 pgoff 0x200-0x2ff

  msync-1085  [006] ....
   200.902579: dax_writeback_range_done: dev 259:0 ino 0x1003 pgoff 0x200-0x2ff

[ross.zwisler@linux.intel.com: fix regression in dax_writeback_mapping_range()]
  Link: http://lkml.kernel.org/r/20170314215358.31451-1-ross.zwisler@linux.intel.com
Link: http://lkml.kernel.org/r/20170221195116.13278-5-ross.zwisler@linux.intel.com
Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Matthew Wilcox <mawilcox@microsoft.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ross Zwisler 2017-05-08 16:00:10 -07:00 committed by Linus Torvalds
parent 678c9fd043
commit d14a3f48a1
2 changed files with 39 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
fs/dax.c
View File

@ -863,6 +863,8 @@ int dax_writeback_mapping_range(struct address_space *mapping,
start_index = wbc->range_start >> PAGE_SHIFT;
end_index = wbc->range_end >> PAGE_SHIFT;
trace_dax_writeback_range(inode, start_index, end_index);
tag_pages_for_writeback(mapping, start_index, end_index);
pagevec_init(&pvec, 0);
@ -882,14 +884,14 @@ int dax_writeback_mapping_range(struct address_space *mapping,
ret = dax_writeback_one(bdev, dax_dev, mapping,
indices[i], pvec.pages[i]);
if (ret < 0) {
put_dax(dax_dev);
return ret;
}
if (ret < 0)
goto out;
}
}
out:
put_dax(dax_dev);
return 0;
trace_dax_writeback_range_done(inode, start_index, end_index);
return (ret < 0 ? ret : 0);
}
EXPORT_SYMBOL_GPL(dax_writeback_mapping_range);

32
include/trace/events/fs_dax.h
View File

@ -194,6 +194,38 @@ DEFINE_PTE_FAULT_EVENT(dax_pfn_mkwrite_no_entry);
DEFINE_PTE_FAULT_EVENT(dax_pfn_mkwrite);
DEFINE_PTE_FAULT_EVENT(dax_load_hole);
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),
TP_STRUCT__entry(
__field(unsigned long, ino)
__field(pgoff_t, start_index)
__field(pgoff_t, end_index)
__field(dev_t, dev)
),
TP_fast_assign(
__entry->dev = inode->i_sb->s_dev;
__entry->ino = inode->i_ino;
__entry->start_index = start_index;
__entry->end_index = end_index;
),
TP_printk("dev %d:%d ino %#lx pgoff %#lx-%#lx",
MAJOR(__entry->dev),
MINOR(__entry->dev),
__entry->ino,
__entry->start_index,
__entry->end_index
)
)
#define DEFINE_WRITEBACK_RANGE_EVENT(name) \
DEFINE_EVENT(dax_writeback_range_class, name, \
TP_PROTO(struct inode *inode, pgoff_t start_index, pgoff_t end_index),\
TP_ARGS(inode, start_index, end_index))
DEFINE_WRITEBACK_RANGE_EVENT(dax_writeback_range);
DEFINE_WRITEBACK_RANGE_EVENT(dax_writeback_range_done);
#endif /* _TRACE_FS_DAX_H */
/* This part must be outside protection */