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 Signed-off-by: Ross Zwisler <[email protected]> --- fs/dax.c | 8 ++++++-- include/trace/events/fs_dax.h | 32 ++++++++++++++++++++++++++++++++ 2 files changed, 38 insertions(+), 2 deletions(-) diff --git a/fs/dax.c b/fs/dax.c index bcfa11a..7ca1989 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -878,6 +878,8 @@ 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); @@ -898,10 +900,12 @@ int dax_writeback_mapping_range(struct address_space *mapping, ret = dax_writeback_one(bdev, mapping, indices[i], pvec.pages[i]); if (ret < 0) - return ret; + goto out; } } - return 0; +out: + trace_dax_writeback_range_done(inode, start_index, end_index); + return ret; } EXPORT_SYMBOL_GPL(dax_writeback_mapping_range); diff --git a/include/trace/events/fs_dax.h b/include/trace/events/fs_dax.h index 2f15dfe..9afe8c8 100644 --- a/include/trace/events/fs_dax.h +++ b/include/trace/events/fs_dax.h @@ -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 */ -- 2.9.3
