See upstream commits:
commit 393da91819e35af538ef97c7c6a04899e2fbfe0e
Author: Liu Bo <bo.li....@oracle.com>
Date: Fri Jan 5 12:51:16 2018 -0700
Btrfs: add tracepoint for em's EEXIST case
This is adding a tracepoint 'btrfs_handle_em_exist' to help debug the
subtle bugs around merge_extent_mapping.
Signed-off-by: Michael Jeanson <mjean...@efficios.com>
---
instrumentation/events/lttng-module/btrfs.h | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/instrumentation/events/lttng-module/btrfs.h
b/instrumentation/events/lttng-module/btrfs.h
index 4eb0db2..c413e92 100644
--- a/instrumentation/events/lttng-module/btrfs.h
+++ b/instrumentation/events/lttng-module/btrfs.h
@@ -273,6 +273,24 @@ LTTNG_TRACEPOINT_EVENT(btrfs_get_extent,
#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,17,0))
+LTTNG_TRACEPOINT_EVENT(btrfs_handle_em_exist,
+
+ TP_PROTO(const struct extent_map *existing, const struct extent_map
*map, u64 start, u64 len),
+
+ TP_ARGS(existing, map, start, len),
+
+ TP_FIELDS(
+ ctf_integer(u64, e_start, existing->start)
+ ctf_integer(u64, e_len, existing->len)
+ ctf_integer(u64, map_start, map->start)
+ ctf_integer(u64, map_len, map->len)
+ ctf_integer(u64, start, start)
+ ctf_integer(u64, len, len)
+ )
+)
+#endif
+
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,14,0))
LTTNG_TRACEPOINT_EVENT_CLASS(btrfs__ordered_extent,
--
2.17.1
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