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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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| .. | ||
| fm | ||
| fs | ||
| arc.h | ||
| avl_impl.h | ||
| avl.h | ||
| bplist.h | ||
| bpobj.h | ||
| bptree.h | ||
| dbuf.h | ||
| ddt.h | ||
| dmu_impl.h | ||
| dmu_objset.h | ||
| dmu_traverse.h | ||
| dmu_tx.h | ||
| dmu_zfetch.h | ||
| dmu.h | ||
| dnode.h | ||
| dsl_dataset.h | ||
| dsl_deadlist.h | ||
| dsl_deleg.h | ||
| dsl_dir.h | ||
| dsl_pool.h | ||
| dsl_prop.h | ||
| dsl_scan.h | ||
| dsl_synctask.h | ||
| efi_partition.h | ||
| Makefile.am | ||
| metaslab_impl.h | ||
| metaslab.h | ||
| nvpair_impl.h | ||
| nvpair.h | ||
| refcount.h | ||
| rrwlock.h | ||
| sa_impl.h | ||
| sa.h | ||
| spa_boot.h | ||
| spa_impl.h | ||
| spa.h | ||
| space_map.h | ||
| txg_impl.h | ||
| txg.h | ||
| u8_textprep_data.h | ||
| u8_textprep.h | ||
| uberblock_impl.h | ||
| uberblock.h | ||
| uio_impl.h | ||
| unique.h | ||
| uuid.h | ||
| vdev_disk.h | ||
| vdev_file.h | ||
| vdev_impl.h | ||
| vdev.h | ||
| xvattr.h | ||
| zap_impl.h | ||
| zap_leaf.h | ||
| zap.h | ||
| zfeature.h | ||
| zfs_acl.h | ||
| zfs_context.h | ||
| zfs_ctldir.h | ||
| zfs_debug.h | ||
| zfs_dir.h | ||
| zfs_fuid.h | ||
| zfs_ioctl.h | ||
| zfs_onexit.h | ||
| zfs_rlock.h | ||
| zfs_sa.h | ||
| zfs_stat.h | ||
| zfs_vfsops.h | ||
| zfs_vnops.h | ||
| zfs_znode.h | ||
| zil_impl.h | ||
| zil.h | ||
| zio_checksum.h | ||
| zio_compress.h | ||
| zio_impl.h | ||
| zio.h | ||
| zpl.h | ||
| zrlock.h | ||
| zvol.h | ||