Qu Wenruo 34e73cc930 btrfs: trace: Introduce trace events for sleepable tree lock ... There are two tree lock events which can sleep: - btrfs_tree_read_lock() - btrfs_tree_lock() Sometimes we may need to look into the concurrency picture of the fs. For that case, we need the execution time of above two functions and the owner of @eb. Here we introduce a trace events for user space tools like bcc, to get the execution time of above two functions, and get detailed owner info where eBPF code can't. All the overhead is hidden behind the trace events, so if events are not enabled, there is no overhead. These trace events also output bytenr and generation, allow them to be pared with unlock events to pin down deadlock. Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>		2019-04-29 19:02:43 +02:00
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events	btrfs: trace: Introduce trace events for sleepable tree lock	2019-04-29 19:02:43 +02:00
bpf_probe.h	bpf: introduce BPF_RAW_TRACEPOINT	2018-03-28 22:55:19 +02:00
define_trace.h	bpf: introduce BPF_RAW_TRACEPOINT	2018-03-28 22:55:19 +02:00
perf.h
syscall.h
trace_events.h	tracing: Prevent further users of zero size static arrays in trace events	2018-05-29 08:29:13 -04:00