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92334b14ec
This change adds a new kstat to gain some visibility into the amount of
time spent in each call to dmu_tx_assign. A histogram is exported via
a new dmu_tx_assign_histogram-$POOLNAME file. The information contained
in this histogram is the frequency dmu_tx_assign took to complete given
an interval range. For example, given the below histogram file:
$ cat /proc/spl/kstat/zfs/dmu_tx_assign_histogram-tank
12 1 0x01 32 1536 19792068076691 20516481514522
name type data
1 us 4 859
2 us 4 252
4 us 4 171
8 us 4 2
16 us 4 0
32 us 4 2
64 us 4 0
128 us 4 0
256 us 4 0
512 us 4 0
1024 us 4 0
2048 us 4 0
4096 us 4 0
8192 us 4 0
16384 us 4 0
32768 us 4 1
65536 us 4 1
131072 us 4 1
262144 us 4 4
524288 us 4 0
1048576 us 4 0
2097152 us 4 0
4194304 us 4 0
8388608 us 4 0
16777216 us 4 0
33554432 us 4 0
67108864 us 4 0
134217728 us 4 0
268435456 us 4 0
536870912 us 4 0
1073741824 us 4 0
2147483648 us 4 0
one can see most calls to dmu_tx_assign completed in 32us or less, but a
few outliers did not. Specifically, 4 of the calls took between 262144us
and 131072us. This information is difficult, if not impossible, to gather
without this change.
Signed-off-by: Prakash Surya <surya1@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1584
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| .. | ||
| arc.c | ||
| bplist.c | ||
| bpobj.c | ||
| bptree.c | ||
| dbuf.c | ||
| ddt_zap.c | ||
| ddt.c | ||
| dmu_diff.c | ||
| dmu_object.c | ||
| dmu_objset.c | ||
| dmu_send.c | ||
| dmu_traverse.c | ||
| dmu_tx.c | ||
| dmu_zfetch.c | ||
| dmu.c | ||
| dnode_sync.c | ||
| dnode.c | ||
| dsl_dataset.c | ||
| dsl_deadlist.c | ||
| dsl_deleg.c | ||
| dsl_dir.c | ||
| dsl_pool.c | ||
| dsl_prop.c | ||
| dsl_scan.c | ||
| dsl_synctask.c | ||
| fm.c | ||
| gzip.c | ||
| lz4.c | ||
| lzjb.c | ||
| Makefile.in | ||
| metaslab.c | ||
| refcount.c | ||
| rrwlock.c | ||
| sa.c | ||
| sha256.c | ||
| spa_boot.c | ||
| spa_config.c | ||
| spa_errlog.c | ||
| spa_history.c | ||
| spa_misc.c | ||
| spa.c | ||
| space_map.c | ||
| txg.c | ||
| uberblock.c | ||
| unique.c | ||
| vdev_cache.c | ||
| vdev_disk.c | ||
| vdev_file.c | ||
| vdev_label.c | ||
| vdev_mirror.c | ||
| vdev_missing.c | ||
| vdev_queue.c | ||
| vdev_raidz.c | ||
| vdev_root.c | ||
| vdev.c | ||
| zap_leaf.c | ||
| zap_micro.c | ||
| zap.c | ||
| zfeature_common.c | ||
| zfeature.c | ||
| zfs_acl.c | ||
| zfs_byteswap.c | ||
| zfs_ctldir.c | ||
| zfs_debug.c | ||
| zfs_dir.c | ||
| zfs_fm.c | ||
| zfs_fuid.c | ||
| zfs_ioctl.c | ||
| zfs_log.c | ||
| zfs_onexit.c | ||
| zfs_replay.c | ||
| zfs_rlock.c | ||
| zfs_sa.c | ||
| zfs_vfsops.c | ||
| zfs_vnops.c | ||
| zfs_znode.c | ||
| zil.c | ||
| zio_checksum.c | ||
| zio_compress.c | ||
| zio_inject.c | ||
| zio.c | ||
| zle.c | ||
| zpl_ctldir.c | ||
| zpl_export.c | ||
| zpl_file.c | ||
| zpl_inode.c | ||
| zpl_super.c | ||
| zpl_xattr.c | ||
| zrlock.c | ||
| zvol.c | ||