liubo 1abe9b8a13 Btrfs: add initial tracepoint support for btrfs ... Tracepoints can provide insight into why btrfs hits bugs and be greatly helpful for debugging, e.g dd-7822 [000] 2121.641088: btrfs_inode_request: root = 5(FS_TREE), gen = 4, ino = 256, blocks = 8, disk_i_size = 0, last_trans = 8, logged_trans = 0 dd-7822 [000] 2121.641100: btrfs_inode_new: root = 5(FS_TREE), gen = 8, ino = 257, blocks = 0, disk_i_size = 0, last_trans = 0, logged_trans = 0 btrfs-transacti-7804 [001] 2146.935420: btrfs_cow_block: root = 2(EXTENT_TREE), refs = 2, orig_buf = 29368320 (orig_level = 0), cow_buf = 29388800 (cow_level = 0) btrfs-transacti-7804 [001] 2146.935473: btrfs_cow_block: root = 1(ROOT_TREE), refs = 2, orig_buf = 29364224 (orig_level = 0), cow_buf = 29392896 (cow_level = 0) btrfs-transacti-7804 [001] 2146.972221: btrfs_transaction_commit: root = 1(ROOT_TREE), gen = 8 flush-btrfs-2-7821 [001] 2155.824210: btrfs_chunk_alloc: root = 3(CHUNK_TREE), offset = 1103101952, size = 1073741824, num_stripes = 1, sub_stripes = 0, type = DATA flush-btrfs-2-7821 [001] 2155.824241: btrfs_cow_block: root = 2(EXTENT_TREE), refs = 2, orig_buf = 29388800 (orig_level = 0), cow_buf = 29396992 (cow_level = 0) flush-btrfs-2-7821 [001] 2155.824255: btrfs_cow_block: root = 4(DEV_TREE), refs = 2, orig_buf = 29372416 (orig_level = 0), cow_buf = 29401088 (cow_level = 0) flush-btrfs-2-7821 [000] 2155.824329: btrfs_cow_block: root = 3(CHUNK_TREE), refs = 2, orig_buf = 20971520 (orig_level = 0), cow_buf = 20975616 (cow_level = 0) btrfs-endio-wri-7800 [001] 2155.898019: btrfs_cow_block: root = 5(FS_TREE), refs = 2, orig_buf = 29384704 (orig_level = 0), cow_buf = 29405184 (cow_level = 0) btrfs-endio-wri-7800 [001] 2155.898043: btrfs_cow_block: root = 7(CSUM_TREE), refs = 2, orig_buf = 29376512 (orig_level = 0), cow_buf = 29409280 (cow_level = 0) Here is what I have added: 1) ordere_extent: btrfs_ordered_extent_add btrfs_ordered_extent_remove btrfs_ordered_extent_start btrfs_ordered_extent_put These provide critical information to understand how ordered_extents are updated. 2) extent_map: btrfs_get_extent extent_map is used in both read and write cases, and it is useful for tracking how btrfs specific IO is running. 3) writepage: __extent_writepage btrfs_writepage_end_io_hook Pages are cirtical resourses and produce a lot of corner cases during writeback, so it is valuable to know how page is written to disk. 4) inode: btrfs_inode_new btrfs_inode_request btrfs_inode_evict These can show where and when a inode is created, when a inode is evicted. 5) sync: btrfs_sync_file btrfs_sync_fs These show sync arguments. 6) transaction: btrfs_transaction_commit In transaction based filesystem, it will be useful to know the generation and who does commit. 7) back reference and cow: btrfs_delayed_tree_ref btrfs_delayed_data_ref btrfs_delayed_ref_head btrfs_cow_block Btrfs natively supports back references, these tracepoints are helpful on understanding btrfs's COW mechanism. 8) chunk: btrfs_chunk_alloc btrfs_chunk_free Chunk is a link between physical offset and logical offset, and stands for space infomation in btrfs, and these are helpful on tracing space things. 9) reserved_extent: btrfs_reserved_extent_alloc btrfs_reserved_extent_free These can show how btrfs uses its space. Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>		2011-03-28 05:37:33 -04:00
..
asoc.h	ASoC: Add trace events for jack detection	2010-12-06 14:13:42 +00:00
bkl.h
block.h	blktrace: Remove blk_fill_rwbs_rq.	2011-03-03 10:53:20 -05:00
btrfs.h	Btrfs: add initial tracepoint support for btrfs	2011-03-28 05:37:33 -04:00
compaction.h	mm: compaction: add trace events for memory compaction activity	2011-01-13 17:32:33 -08:00
ext4.h	ext4: Add new ext4 inode tracepoints	2010-11-08 13:51:33 -05:00
gfpflags.h	vmscan: tracing: add trace events for kswapd wakeup, sleeping and direct reclaim	2010-08-09 20:44:59 -07:00
irq.h	tracing: Cleanup the convoluted softirq tracepoints	2010-10-21 16:50:29 +02:00
jbd2.h	ext4,jbd2: convert tracepoints to use major/minor numbers	2010-10-27 22:08:50 -04:00
kmem.h	vmscan: tracing: add trace events for kswapd wakeup, sleeping and direct reclaim	2010-08-09 20:44:59 -07:00
kvm.h	KVM: cleanup async_pf tracepoints	2011-01-12 11:28:57 +02:00
lock.h	tracing: Factorize lock events in a lock class	2010-05-09 13:45:35 +02:00
mce.h
module.h	tracing: Only process module tracepoints once	2011-01-14 11:25:58 -05:00
napi.h	napi: Convert trace_napi_poll to TRACE_EVENT	2010-09-07 17:51:01 +02:00
net.h	netdev: Add tracepoints to netdev layer	2010-09-07 17:51:33 +02:00
power.h	perf: Clean up power events by introducing new, more generic ones	2011-01-04 08:16:54 +01:00
regulator.h	regulator: Add basic trace facilities	2011-01-12 14:33:00 +00:00
sched.h	tracing/sched: Add sched_pi_setprio tracepoint	2010-09-21 10:56:41 -04:00
scsi.h	[SCSI] scsi_trace: Enhance SCSI command tracing	2010-04-30 12:52:08 -05:00
signal.h	tracing: Fix null pointer deref with SEND_SIG_FORCED	2010-06-08 23:51:32 +02:00
skb.h	tracing: remove duplicate null-pointer check in skb tracepoint	2011-01-07 20:55:42 -05:00
syscalls.h	tracing: Allow raw syscall trace events for non privileged users	2010-11-18 14:37:43 +01:00
timer.h	tracing: Fix timer tracing	2010-08-19 13:00:41 +02:00
vmscan.h	mm: vmscan: rename lumpy_mode to reclaim_mode	2011-01-13 17:32:34 -08:00
workqueue.h	workqueue: add queue_work and activate_work trace points	2010-10-05 10:49:55 +02:00
writeback.h	writeback: trace wakeup event for background writeback	2011-01-13 17:32:32 -08:00