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authorHitoshi Mitake <mitake.hitoshi@lab.ntt.co.jp>2015-11-06 16:31:59 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-11-06 17:50:42 -0800
commit58497703837048ac501ce56056eb74b4361108fc (patch)
tree57165f47606930e10f15d475e999ccdf9a273e7f /include
parentd0c14a9ee79467cd6a04b281577e1e6f74806ab2 (diff)
downloadlinux-stericsson-58497703837048ac501ce56056eb74b4361108fc.tar.gz
nilfs2: add a tracepoint for tracking stage transition of segment construction
This patch adds a tracepoint for tracking stage transition of block collection in segment construction. With the tracepoint, we can analysis the behavior of segment construction in depth. It would be useful for bottleneck detection and debugging, etc. The tracepoint is created with the standard trace API of linux (like ext3, ext4, f2fs and btrfs). So we can analysis with existing tools easily. Of course, more detailed analysis will be possible if we can create nilfs specific analysis tools. Below is an example of event dump with Brendan Gregg's perf-tools (https://github.com/brendangregg/perf-tools). Time consumption between each stage can be obtained. $ sudo bin/tpoint nilfs2:nilfs2_collection_stage_transition Tracing nilfs2:nilfs2_collection_stage_transition. Ctrl-C to end. segctord-14875 [003] ...1 28311.067794: nilfs2_collection_stage_transition: sci = ffff8800ce6de000 stage = ST_INIT segctord-14875 [003] ...1 28311.068139: nilfs2_collection_stage_transition: sci = ffff8800ce6de000 stage = ST_GC segctord-14875 [003] ...1 28311.068139: nilfs2_collection_stage_transition: sci = ffff8800ce6de000 stage = ST_FILE segctord-14875 [003] ...1 28311.068486: nilfs2_collection_stage_transition: sci = ffff8800ce6de000 stage = ST_IFILE segctord-14875 [003] ...1 28311.068540: nilfs2_collection_stage_transition: sci = ffff8800ce6de000 stage = ST_CPFILE segctord-14875 [003] ...1 28311.068561: nilfs2_collection_stage_transition: sci = ffff8800ce6de000 stage = ST_SUFILE segctord-14875 [003] ...1 28311.068565: nilfs2_collection_stage_transition: sci = ffff8800ce6de000 stage = ST_DAT segctord-14875 [003] ...1 28311.068573: nilfs2_collection_stage_transition: sci = ffff8800ce6de000 stage = ST_SR segctord-14875 [003] ...1 28311.068574: nilfs2_collection_stage_transition: sci = ffff8800ce6de000 stage = ST_DONE For capturing transition correctly, this patch adds wrappers for the member scnt of nilfs_cstage. With this change, every transition of the stage can produce trace event in a correct manner. Signed-off-by: Hitoshi Mitake <mitake.hitoshi@lab.ntt.co.jp> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Cc: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/trace/events/nilfs2.h50
1 files changed, 50 insertions, 0 deletions
diff --git a/include/trace/events/nilfs2.h b/include/trace/events/nilfs2.h
new file mode 100644
index 000000000000..573da00a486d
--- /dev/null
+++ b/include/trace/events/nilfs2.h
@@ -0,0 +1,50 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM nilfs2
+
+#if !defined(_TRACE_NILFS2_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_NILFS2_H
+
+#include <linux/tracepoint.h>
+
+struct nilfs_sc_info;
+
+#define show_collection_stage(type) \
+ __print_symbolic(type, \
+ { NILFS_ST_INIT, "ST_INIT" }, \
+ { NILFS_ST_GC, "ST_GC" }, \
+ { NILFS_ST_FILE, "ST_FILE" }, \
+ { NILFS_ST_IFILE, "ST_IFILE" }, \
+ { NILFS_ST_CPFILE, "ST_CPFILE" }, \
+ { NILFS_ST_SUFILE, "ST_SUFILE" }, \
+ { NILFS_ST_DAT, "ST_DAT" }, \
+ { NILFS_ST_SR, "ST_SR" }, \
+ { NILFS_ST_DSYNC, "ST_DSYNC" }, \
+ { NILFS_ST_DONE, "ST_DONE"})
+
+TRACE_EVENT(nilfs2_collection_stage_transition,
+
+ TP_PROTO(struct nilfs_sc_info *sci),
+
+ TP_ARGS(sci),
+
+ TP_STRUCT__entry(
+ __field(void *, sci)
+ __field(int, stage)
+ ),
+
+ TP_fast_assign(
+ __entry->sci = sci;
+ __entry->stage = sci->sc_stage.scnt;
+ ),
+
+ TP_printk("sci = %p stage = %s",
+ __entry->sci,
+ show_collection_stage(__entry->stage))
+);
+
+#endif /* _TRACE_NILFS2_H */
+
+/* This part must be outside protection */
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE nilfs2
+#include <trace/define_trace.h>