[0/3] null_blk: add tracnepoints for zoned mode

Message

Chaitanya Kulkarni Feb. 15, 2020, 12:57 a.m. UTC

Hi,

Recently we've added several new operations for zoned block devices
blk-zone.c ZBD). These operations have a direct effect on the
zone-state machine present in the null_blk_zoned.c. 

This will allow us to add new testcases in blktests in order to verify
the correct operations on the driver side.

This is a small patch series which adds tracepoints for the null_blk
block driver when configured in a zoned mode (with command line
parameter zoned=1).

The first patch is a prep patch that adds a helper to stringify zone
conditions which we use in the trace, the second patch adds new
tracepoint definitions and the third patch allows null_blk_zoned to
trace operations.

Please have a look at the end for sample output.

P.S. I've kept the helper function blk_zone_cond_str() into header
file, please let me know if it needs to be in the blk-zoned.c.

Regards,
Chaitanya              

Chaitanya Kulkarni (3):
  block: add zone condition debug helpers
  null_blk: add tracepoint helpers for zoned mode
  null_blk: add trace in null_blk_zoned.c

 block/blk-zoned.c              | 14 ++++++
 drivers/block/Makefile         |  3 ++
 drivers/block/null_blk_trace.c | 20 +++++++++
 drivers/block/null_blk_trace.h | 78 ++++++++++++++++++++++++++++++++++
 drivers/block/null_blk_zoned.c | 12 +++++-
 include/linux/blkdev.h         | 26 ++++++++++++
 include/uapi/linux/blkzoned.h  |  1 +
 7 files changed, 153 insertions(+), 1 deletion(-)
 create mode 100644 drivers/block/null_blk_trace.c
 create mode 100644 drivers/block/null_blk_trace.h

Sample Test Output :-

# modprobe null_blk zoned=1 zone_size=128 gb=1 bs=4096
# cd /sys/kernel/debug/tracing/
# echo 1 > events/nullb/enable; cat trace_pipe 
# for i in open close finish reset; do blkzone $i /dev/nullb0; done 
# dd if=/dev/zero of=/dev/nullb0 bs=4k count=5

nullb_zone_op: disk=nullb0,  req=ZONE_OPEN       zone_no=0 zone_cond=EXP_OPEN  
nullb_zone_op: disk=nullb0,  req=ZONE_OPEN       zone_no=1 zone_cond=EXP_OPEN  
nullb_zone_op: disk=nullb0,  req=ZONE_OPEN       zone_no=2 zone_cond=EXP_OPEN  
nullb_zone_op: disk=nullb0,  req=ZONE_OPEN       zone_no=3 zone_cond=EXP_OPEN  
nullb_zone_op: disk=nullb0,  req=ZONE_OPEN       zone_no=4 zone_cond=EXP_OPEN  
nullb_zone_op: disk=nullb0,  req=ZONE_OPEN       zone_no=5 zone_cond=EXP_OPEN  
nullb_zone_op: disk=nullb0,  req=ZONE_OPEN       zone_no=6 zone_cond=EXP_OPEN  
nullb_zone_op: disk=nullb0,  req=ZONE_OPEN       zone_no=7 zone_cond=EXP_OPEN  
nullb_zone_op: disk=nullb0,  req=ZONE_CLOSE      zone_no=0 zone_cond=EMPTY     
nullb_zone_op: disk=nullb0,  req=ZONE_CLOSE      zone_no=1 zone_cond=EMPTY     
nullb_zone_op: disk=nullb0,  req=ZONE_CLOSE      zone_no=2 zone_cond=EMPTY     
nullb_zone_op: disk=nullb0,  req=ZONE_CLOSE      zone_no=3 zone_cond=EMPTY     
nullb_zone_op: disk=nullb0,  req=ZONE_CLOSE      zone_no=4 zone_cond=EMPTY     
nullb_zone_op: disk=nullb0,  req=ZONE_CLOSE      zone_no=5 zone_cond=EMPTY     
nullb_zone_op: disk=nullb0,  req=ZONE_CLOSE      zone_no=6 zone_cond=EMPTY     
nullb_zone_op: disk=nullb0,  req=ZONE_CLOSE      zone_no=7 zone_cond=EMPTY     
nullb_zone_op: disk=nullb0,  req=ZONE_FINISH     zone_no=0 zone_cond=FULL      
nullb_zone_op: disk=nullb0,  req=ZONE_FINISH     zone_no=1 zone_cond=FULL      
nullb_zone_op: disk=nullb0,  req=ZONE_FINISH     zone_no=2 zone_cond=FULL      
nullb_zone_op: disk=nullb0,  req=ZONE_FINISH     zone_no=3 zone_cond=FULL      
nullb_zone_op: disk=nullb0,  req=ZONE_FINISH     zone_no=4 zone_cond=FULL      
nullb_zone_op: disk=nullb0,  req=ZONE_FINISH     zone_no=5 zone_cond=FULL      
nullb_zone_op: disk=nullb0,  req=ZONE_FINISH     zone_no=6 zone_cond=FULL      
nullb_zone_op: disk=nullb0,  req=ZONE_FINISH     zone_no=7 zone_cond=FULL      
nullb_zone_op: disk=nullb0,  req=ZONE_RESET_ALL  zone_no=0 zone_cond=EMPTY 
nullb_zone_op: disk=nullb0,  req=WRITE           zone_no=0 zone_cond=IMP_OPEN  
nullb_zone_op: disk=nullb0,  req=WRITE           zone_no=0 zone_cond=IMP_OPEN  
nullb_zone_op: disk=nullb0,  req=WRITE           zone_no=0 zone_cond=IMP_OPEN  
nullb_zone_op: disk=nullb0,  req=WRITE           zone_no=0 zone_cond=IMP_OPEN  
nullb_zone_op: disk=nullb0,  req=WRITE           zone_no=0 zone_cond=IMP_OPEN