Matthew Ahrens d9cd66e45f Target ARC size can get reduced to arc_c_min ... Sometimes the target ARC size is reduced to arc_c_min, which impacts performance. We've seen this happen as part of the random_reads performance regression test, where the ARC size is reduced before the reads test starts which impacts how long it takes for system to reach good IOPS performance. We call arc_reduce_target_size when arc_reap_cb_check() returns TRUE, and arc_available_memory() is less than arc_c>>arc_shrink_shift. However, arc_available_memory() could easily be low, even when arc_c is low, because we can have tons of unused bufs in the abd kmem cache. This would be especially true just after the DMU requests a bunch of stuff be evicted from the ARC (e.g. due to "zpool export"). To fix this, the ARC should reduce arc_c by the requested amount, not all the way down to arc_size (or arc_c_min), which can be very small. Reviewed-by: Tim Chase <tim@chase2k.com> Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: George Melikov <mail@gmelikov.ru> Signed-off-by: Matthew Ahrens <mahrens@delphix.com> External-issue: DLPX-59431 Closes #8864		2019-06-12 13:06:55 -07:00
..
abd.c	single-chunk scatter ABDs can be treated as linear	2019-06-11 09:02:31 -07:00
aggsum.c	OpenZFS 9688 - aggsum_fini leaks memory	2018-10-19 12:08:03 -07:00
arc.c	Target ARC size can get reduced to arc_c_min	2019-06-12 13:06:55 -07:00
blkptr.c	Undo c89 workarounds to match with upstream	2017-11-04 13:25:13 -07:00
bplist.c	Change KM_PUSHPAGE -> KM_SLEEP	2015-01-16 14:41:26 -08:00
bpobj.c	Stack overflow in recursive bpobj_iterate_impl	2019-03-06 09:50:55 -08:00
bptree.c	Native Encryption for ZFS on Linux	2017-08-14 10:36:48 -07:00
bqueue.c	Wait in 'S' state when send/recv pipe is blocking	2019-06-03 20:54:43 -07:00
cityhash.c	OpenZFS 8484 - Implement aggregate sum and use for arc counters	2018-06-06 09:35:59 -07:00
dataset_kstats.c	port async unlinked drain from illumos-nexenta	2019-02-12 10:41:15 -08:00
dbuf_stats.c	Prefix all refcount functions with zfs_	2018-10-01 10:42:05 -07:00
dbuf.c	Fix send/recv lost spill block	2019-05-07 15:18:44 -07:00
ddt_zap.c	Update build system and packaging	2018-05-29 16:00:33 -07:00
ddt.c	ztest: scrub ddt repair	2019-01-17 15:25:00 -08:00
dmu_diff.c	Fix issues found with zfs diff	2018-05-01 11:24:20 -07:00
dmu_object.c	Fix send/recv lost spill block	2019-05-07 15:18:44 -07:00
dmu_objset.c	Prevent user accounting on readonly pool	2019-02-19 18:41:18 -08:00
dmu_recv.c	Fix incorrect error message for raw receive	2019-06-10 09:45:08 -07:00
dmu_send.c	Fix send/recv lost spill block	2019-05-07 15:18:44 -07:00
dmu_traverse.c	Fix traverse_impl() kmem leak	2018-08-15 09:53:44 -07:00
dmu_tx.c	Prefix all refcount functions with zfs_	2018-10-01 10:42:05 -07:00
dmu_zfetch.c	Linux 5.2 compat: rw_tryupgrade()	2019-05-23 13:46:33 -07:00
dmu.c	Revert "Report holes when there are only metadata changes"	2019-05-30 17:13:18 -07:00
dnode_sync.c	Reinstate raw receive check when truncating	2019-06-06 13:47:33 -07:00
dnode.c	Fix incorrect assertion in dnode_dirty_l1range	2019-05-19 17:30:33 -07:00
dsl_bookmark.c	Detect and prevent mixed raw and non-raw sends	2019-03-13 11:00:43 -07:00
dsl_crypt.c	Better user experience for errata 4	2019-03-14 16:48:30 -07:00
dsl_dataset.c	Mutex leak in dsl_dataset_hold_obj()	2019-03-21 10:36:58 -07:00
dsl_deadlist.c	OpenZFS 7614, 9064 - zfs device evacuation/removal	2018-04-14 12:16:17 -07:00
dsl_deleg.c	Update build system and packaging	2018-05-29 16:00:33 -07:00
dsl_destroy.c	zfs receive and rollback can skew filesystem_count	2019-01-08 10:17:46 -08:00
dsl_dir.c	Fix TXG_MASK cstyle	2019-04-12 11:30:59 -07:00
dsl_pool.c	port async unlinked drain from illumos-nexenta	2019-02-12 10:41:15 -08:00
dsl_prop.c	Update build system and packaging	2018-05-29 16:00:33 -07:00
dsl_scan.c	Make zfs_async_block_max_blocks handle zero correctly	2019-06-03 09:40:48 -07:00
dsl_synctask.c	OpenZFS 9166 - zfs storage pool checkpoint	2018-06-26 10:07:42 -07:00
dsl_userhold.c	zfs should optionally send holds	2019-02-15 12:41:38 -08:00
edonr_zfs.c	DLPX-44812 integrate EP-220 large memory scalability	2016-11-29 14:34:27 -08:00
fm.c	OpenZFS 9580 - Add a hash-table on top of nvlist to speed-up operations	2018-07-30 11:30:03 -07:00
gzip.c	Update build system and packaging	2018-05-29 16:00:33 -07:00
hkdf.c	Encryption patch follow-up	2017-10-11 16:54:48 -04:00
lz4.c	Reword comment in lz4_compress_zfs	2019-05-02 16:46:04 -07:00
lzjb.c	Change KM_PUSHPAGE -> KM_SLEEP	2015-01-16 14:41:26 -08:00
Makefile.in	Add TRIM support	2019-03-29 09:13:20 -07:00
metaslab.c	Allow metaslab to be unloaded even when not freed from	2019-06-06 19:10:43 -07:00
mmp.c	MMP interval and fail_intervals in uberblock	2019-03-21 12:47:57 -07:00
multilist.c	Update build system and packaging	2018-05-29 16:00:33 -07:00
pathname.c	Update build system and packaging	2018-05-29 16:00:33 -07:00
policy.c	Take user namespaces into account in policy checks	2018-03-07 15:40:42 -08:00
qat_compress.c	Code improvement and bug fixes for QAT support	2019-04-16 12:38:36 -07:00
qat_crypt.c	Code improvement and bug fixes for QAT support	2019-04-16 12:38:36 -07:00
qat.c	Code improvement and bug fixes for QAT support	2019-04-16 12:38:36 -07:00
qat.h	Code improvement and bug fixes for QAT support	2019-04-16 12:38:36 -07:00
range_tree.c	Restrict kstats and print real pointers	2019-04-04 18:57:06 -07:00
refcount.c	Add zfs_refcount_transfer_ownership_many()	2018-10-09 10:05:48 -07:00
rrwlock.c	Prefix all refcount functions with zfs_	2018-10-01 10:42:05 -07:00
sa.c	Prefix all refcount functions with zfs_	2018-10-01 10:42:05 -07:00
sha256.c	SHA256 QAT acceleration	2018-03-15 10:53:58 -07:00
skein_zfs.c	DLPX-44812 integrate EP-220 large memory scalability	2016-11-29 14:34:27 -08:00
spa_boot.c	Add linux kernel module support	2010-08-31 13:41:58 -07:00
spa_checkpoint.c	Get rid of space_map_update() for ms_synced_length	2019-02-12 10:38:11 -08:00
spa_config.c	Remove vn_set_fs_pwd()/vn_set_pwd() (no need to be at / during insmod)	2019-05-29 16:18:14 -07:00
spa_errlog.c	Update build system and packaging	2018-05-29 16:00:33 -07:00
spa_history.c	Create /proc/sys/kernel/spl/gitrev with git hash	2018-10-08 21:57:02 -07:00
spa_misc.c	Fix coverity defects: CID 186143	2019-05-23 19:17:00 -07:00
spa_stats.c	Restrict kstats and print real pointers	2019-04-04 18:57:06 -07:00
spa.c	zpool import progress kstat	2019-05-09 10:08:05 -07:00
space_map.c	Restrict kstats and print real pointers	2019-04-04 18:57:06 -07:00
space_reftree.c	OpenZFS 7614, 9064 - zfs device evacuation/removal	2018-04-14 12:16:17 -07:00
THIRDPARTYLICENSE.cityhash	OpenZFS 8484 - Implement aggregate sum and use for arc counters	2018-06-06 09:35:59 -07:00
THIRDPARTYLICENSE.cityhash.descrip	OpenZFS 8484 - Implement aggregate sum and use for arc counters	2018-06-06 09:35:59 -07:00
trace.c	OpenZFS 7614, 9064 - zfs device evacuation/removal	2018-04-14 12:16:17 -07:00
txg.c	Fix txg_wait_open() load average inflation	2019-04-04 09:44:46 -07:00
uberblock.c	MMP interval and fail_intervals in uberblock	2019-03-21 12:47:57 -07:00
unique.c	Performance optimization of AVL tree comparator functions	2016-08-31 14:35:34 -07:00
vdev_cache.c	Update build system and packaging	2018-05-29 16:00:33 -07:00
vdev_disk.c	Improve rate at which new zvols are processed	2019-05-04 16:39:10 -07:00
vdev_file.c	Use SEEK_{SET,CUR,END} for file seek "whence"	2019-04-25 10:17:27 -07:00
vdev_indirect_births.c	Update build system and packaging	2018-05-29 16:00:33 -07:00
vdev_indirect_mapping.c	Get rid of space_map_update() for ms_synced_length	2019-02-12 10:38:11 -08:00
vdev_indirect.c	Device removal panics on 32-bit systems	2019-05-24 12:17:52 -07:00
vdev_initialize.c	Add TRIM support	2019-03-29 09:13:20 -07:00
vdev_label.c	Add TRIM support	2019-03-29 09:13:20 -07:00
vdev_mirror.c	Cleanup nits from ab7615d92	2019-04-14 11:03:06 -07:00
vdev_missing.c	OpenZFS 9102 - zfs should be able to initialize storage devices	2019-01-07 10:37:26 -08:00
vdev_queue.c	Add TRIM support	2019-03-29 09:13:20 -07:00
vdev_raidz_math_aarch64_neon_common.h	Linux 5.0 compat: ASM_BUG macro	2019-05-08 10:18:40 -07:00
vdev_raidz_math_aarch64_neon.c	codebase style improvements for OpenZFS 6459 port	2017-01-22 13:25:40 -08:00
vdev_raidz_math_aarch64_neonx2.c	ABD raidz NEON support	2016-11-29 14:34:33 -08:00
vdev_raidz_math_avx2.c	Linux 5.0 compat: ASM_BUG macro	2019-05-08 10:18:40 -07:00
vdev_raidz_math_avx512bw.c	Linux 5.0 compat: ASM_BUG macro	2019-05-08 10:18:40 -07:00
vdev_raidz_math_avx512f.c	Use cstyle -cpP in make cstyle check	2016-12-12 10:46:26 -08:00
vdev_raidz_math_impl.h	codebase style improvements for OpenZFS 6459 port	2017-01-22 13:25:40 -08:00
vdev_raidz_math_scalar.c	ABD Vectorized raidz	2016-11-29 14:34:33 -08:00
vdev_raidz_math_sse2.c	ABD raidz avx512f support	2016-11-29 14:34:33 -08:00
vdev_raidz_math_ssse3.c	Linux 5.0 compat: ASM_BUG macro	2019-05-08 10:18:40 -07:00
vdev_raidz_math.c	Fix typo in vdev_raidz_math.c	2019-06-12 13:03:33 -07:00
vdev_raidz.c	Add TRIM support	2019-03-29 09:13:20 -07:00
vdev_removal.c	Restrict kstats and print real pointers	2019-04-04 18:57:06 -07:00
vdev_root.c	OpenZFS 9102 - zfs should be able to initialize storage devices	2019-01-07 10:37:26 -08:00
vdev_trim.c	Add TRIM support	2019-03-29 09:13:20 -07:00
vdev.c	Allow metaslab to be unloaded even when not freed from	2019-06-06 19:10:43 -07:00
zap_leaf.c	Off-by-one in zap_leaf_array_create()	2019-01-18 09:58:46 -08:00
zap_micro.c	Provide more flexible object allocation interface	2019-01-10 14:37:43 -08:00
zap.c	OpenZFS 9328 - zap code can take advantage of c99	2018-05-31 10:53:11 -07:00
zcp_get.c	Detect and prevent mixed raw and non-raw sends	2019-03-13 11:00:43 -07:00
zcp_global.c	OpenZFS 8600 - ZFS channel programs - snapshot	2018-02-08 15:29:24 -08:00
zcp_iter.c	OpenZFS 9337 - zfs get all is slow due to uncached metadata	2018-07-12 10:49:27 -07:00
zcp_synctask.c	OpenZFS 9166 - zfs storage pool checkpoint	2018-06-26 10:07:42 -07:00
zcp.c	OpenZFS 9424 - ztest failure: "unprotected error in call to Lua API (Invalid value type 'function' for key 'error')"	2018-07-10 21:29:23 -07:00
zfeature.c	Consistently captialize GUID for features	2019-04-16 10:01:51 -07:00
zfs_acl.c	Update build system and packaging	2018-05-29 16:00:33 -07:00
zfs_byteswap.c	Update build system and packaging	2018-05-29 16:00:33 -07:00
zfs_ctldir.c	Drop local definition of MOUNT_BUSY	2019-05-24 16:43:23 -07:00
zfs_debug.c	Restrict kstats and print real pointers	2019-04-04 18:57:06 -07:00
zfs_dir.c	port async unlinked drain from illumos-nexenta	2019-02-12 10:41:15 -08:00
zfs_fm.c	Add zpool status -s (slow I/Os) and -p (parseable)	2018-11-08 16:47:24 -08:00
zfs_fuid.c	Update build system and packaging	2018-05-29 16:00:33 -07:00
zfs_ioctl.c	Remove vn_set_fs_pwd()/vn_set_pwd() (no need to be at / during insmod)	2019-05-29 16:18:14 -07:00
zfs_log.c	make zil max block size tunable	2019-06-10 11:48:42 -07:00
zfs_onexit.c	Update build system and packaging	2018-05-29 16:00:33 -07:00
zfs_ratelimit.c	Change checksum & IO delay ratelimit values	2018-03-04 17:34:51 -08:00
zfs_replay.c	Use SEEK_{SET,CUR,END} for file seek "whence"	2019-04-25 10:17:27 -07:00
zfs_rlock.c	OpenZFS 9689 - zfs range lock code should not be zpl-specific	2018-10-11 10:19:33 -07:00
zfs_sa.c	Project Quota on ZFS	2018-02-13 14:54:54 -08:00
zfs_sysfs.c	features.kernel layout should match features.pool	2019-04-04 19:00:55 -07:00
zfs_vfsops.c	Add missing trailing '\n' in printk() messages	2019-05-08 16:43:55 -07:00
zfs_vnops.c	Update descriptions for vnops	2019-05-25 14:29:10 -07:00
zfs_znode.c	Fix integer overflow of ZTOI(zp)->i_generation	2019-06-06 12:59:39 -07:00
zil.c	make zil max block size tunable	2019-06-10 11:48:42 -07:00
zio_checksum.c	Undo c89 workarounds to match with upstream	2017-11-04 13:25:13 -07:00
zio_compress.c	OpenZFS 9403 - assertion failed in arc_buf_destroy()	2018-08-29 11:33:33 -07:00
zio_crypt.c	Always call rw_init in zio_crypt_key_unwrap	2019-04-10 15:39:40 -07:00
zio_inject.c	Multiple DVA Scrubbing Fix	2019-03-15 14:14:31 -07:00
zio.c	single-chunk scatter ABDs can be treated as linear	2019-06-11 09:02:31 -07:00
zle.c	Fix zle_decompress out of bound access	2018-02-09 10:08:05 -08:00
zpl_ctldir.c	RHEL 7.5 compat: FMODE_KABI_ITERATE	2018-05-02 15:01:24 -07:00
zpl_export.c	Use cstyle -cpP in make cstyle check	2016-12-12 10:46:26 -08:00
zpl_file.c	Fix errant EFAULT during writes (#8719)	2019-05-08 10:04:04 -07:00
zpl_inode.c	Fix errant EFAULT during writes (#8719)	2019-05-08 10:04:04 -07:00
zpl_super.c	Fix statfs(2) for 32-bit user space	2018-09-24 17:11:25 -07:00
zpl_xattr.c	Add missing checks to zpl_xattr_* functions	2018-08-02 14:03:56 -07:00
zrlock.c	Update build system and packaging	2018-05-29 16:00:33 -07:00
zthr.c	Fix txg_wait_open() load average inflation	2019-04-04 09:44:46 -07:00
zvol.c	make zil max block size tunable	2019-06-10 11:48:42 -07:00