Brian Behlendorf ae6ba3dbe6 Improve meta data performance ... Profiling the system during meta data intensive workloads such as creating/removing millions of files, revealed that the system was cpu bound. A large fraction of that cpu time was being spent waiting on the virtual address space spin lock. It turns out this was caused by certain heavily used kmem_caches being backed by virtual memory. By default a kmem_cache will dynamically determine the type of memory used based on the object size. For large objects virtual memory is usually preferable and for small object physical memory is a better choice. See the spl_slab_alloc() function for a longer discussion on this. However, there is a certain amount of gray area when defining a 'large' object. For the following caches it turns out they were just over the line: * dnode_cache * zio_cache * zio_link_cache * zio_buf_512_cache * zfs_data_buf_512_cache Now because we know there will be a lot of churn in these caches, and because we know the slabs will still be reasonably sized. We can safely request with the KMC_KMEM flag that the caches be backed with physical memory addresses. This entirely avoids the need to serialize on the virtual address space lock. As a bonus this also reduces our vmalloc usage which will be good for 32-bit kernels which have a very small virtual address space. It will also probably be good for interactive performance since unrelated processes could also block of this same global lock. Finally, we may see less cpu time being burned in the arc_reclaim and txg_sync_threads. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #258		2011-11-03 10:19:21 -07:00
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fm	Autogen refresh for udev changes	2011-08-08 16:30:27 -07:00
fs	Autogen refresh for udev changes	2011-08-08 16:30:27 -07:00
arc.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
avl_impl.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
avl.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
bplist.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
bpobj.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
dbuf.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
ddt.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
dmu_impl.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
dmu_objset.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
dmu_traverse.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
dmu_tx.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
dmu_zfetch.h	Add missing ZFS tunables	2011-05-04 10:02:37 -07:00
dmu.h	Illumos #755: dmu_recv_stream builds incomplete guid_to_ds_map	2011-10-18 11:18:14 -07:00
dnode.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
dsl_dataset.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
dsl_deadlist.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
dsl_deleg.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
dsl_dir.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
dsl_pool.h	Prototype/structure update for Linux	2011-02-10 09:27:21 -08:00
dsl_prop.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
dsl_scan.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
dsl_synctask.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
efi_partition.h	Make libefi-created GPT compatible with gptfdisk	2011-09-26 09:44:43 -07:00
Makefile.am	Add xvattr support	2011-03-02 11:43:50 -08:00
Makefile.in	Autogen refresh for udev changes	2011-08-08 16:30:27 -07:00
metaslab_impl.h	Illumos #1051: zfs should handle imbalanced luns	2011-08-01 12:09:11 -07:00
metaslab.h	Illumos #1051: zfs should handle imbalanced luns	2011-08-01 12:09:11 -07:00
nvpair_impl.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
nvpair.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
refcount.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
rrwlock.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
sa_impl.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
sa.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
spa_boot.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
spa_impl.h	Illumos #1051: zfs should handle imbalanced luns	2011-08-01 12:09:11 -07:00
spa.h	Illumos #1051: zfs should handle imbalanced luns	2011-08-01 12:09:11 -07:00
space_map.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
txg_impl.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
txg.h	Add API to wait for pending commit callbacks	2011-02-16 11:20:06 -08:00
u8_textprep_data.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
u8_textprep.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
uberblock_impl.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
uberblock.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
uio_impl.h	Add basic uio support	2011-02-10 09:21:43 -08:00
unique.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
uuid.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
vdev_disk.h	Linux 2.6.x compat, blkdev_compat.h	2011-02-23 12:29:38 -08:00
vdev_file.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
vdev_impl.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
vdev.h	Add missing ZFS tunables	2011-05-04 10:02:37 -07:00
xvattr.h	Add xvattr support	2011-03-02 11:43:50 -08:00
zap_impl.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
zap_leaf.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
zap.h	Export symbols for the full ZAP API	2011-09-27 16:12:36 -07:00
zfs_acl.h	Add xvattr support	2011-03-02 11:43:50 -08:00
zfs_context.h	Improve meta data performance	2011-11-03 10:19:21 -07:00
zfs_debug.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
zfs_dir.h	Prototype/structure update for Linux	2011-02-10 09:27:21 -08:00
zfs_fuid.h	Prototype/structure update for Linux	2011-02-10 09:27:21 -08:00
zfs_ioctl.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
zfs_onexit.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
zfs_rlock.h	Range lock performance improvements	2011-03-08 12:44:06 -08:00
zfs_sa.h	Export symbols for the full SA API	2011-10-05 15:59:56 -07:00
zfs_stat.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
zfs_vfsops.h	Export symbols for the VFS API	2011-10-11 10:25:59 -07:00
zfs_vnops.h	Cleanup mmap(2) writes	2011-08-02 10:34:55 -07:00
zfs_znode.h	Linux compat 2.6.39: mount_nodev()	2011-07-01 13:36:39 -07:00
zil_impl.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
zil.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
zio_checksum.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
zio_compress.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
zio_impl.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
zio.h	Initial zio delay timing	2010-10-12 14:55:02 -07:00
zpl.h	Linux compat 2.6.39: mount_nodev()	2011-07-01 13:36:39 -07:00
zrlock.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
zvol.h	Linux 2.6.x compat, blkdev_compat.h	2011-02-23 12:29:38 -08:00