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5f42d1dbf2
mirror_zfs/module/zfs
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Alexander Motin 5f42d1dbf2
System-wide speculative prefetch limit. 
With some pathological access patterns it is possible to make ZFS
accumulate almost unlimited amount of speculative prefetch ZIOs.
Combined with linear ABD allocations in RAIDZ code, it appears to
be possible to exhaust system KVA, triggering kernel panic.

Address this by introducing a system-wide counter of active prefetch
requests and blocking prefetch distance doubling per stream hits if
the number of active requests is higher that ~6% of ARC size.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by:  Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes #14516
2023-03-01 15:27:40 -08:00
..
abd.c abd_return_buf() should call zfs_refcount_remove_many() early 2022-10-19 17:11:01 -07:00
aggsum.c Remove bcopy(), bzero(), bcmp() 2022-03-15 15:13:42 -07:00
arc.c Skip memory allocation when compressing holes 2023-02-27 14:41:02 -08:00
blake3_zfs.c Cleanup: Use NULL when doing NULL pointer comparisons 2023-01-12 16:00:37 -08:00
blkptr.c Remove bcopy(), bzero(), bcmp() 2022-03-15 15:13:42 -07:00
bplist.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
bpobj.c Prefetch on deadlists merge 2023-01-25 11:30:24 -08:00
bptree.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
bqueue.c Batch enqueue/dequeue for bqueue 2023-01-10 13:39:22 -08:00
btree.c Optimize microzaps 2022-10-20 11:57:15 -07:00
dataset_kstats.c Introduce kmem_scnprintf() 2022-10-29 13:05:11 -07:00
dbuf_stats.c Revert "Reduce dbuf_find() lock contention" 2022-09-22 12:59:41 -07:00
dbuf.c Suppress static analyzer warning in dbuf_hold_copy() 2023-02-28 17:31:50 -08:00
ddt_zap.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
ddt.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
dmu_diff.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
dmu_object.c zfs redact fails when dnodesize=auto 2023-02-16 09:23:39 -08:00
dmu_objset.c Suppress static analyzer warning in dmu_objset_create_impl_dnstats() 2023-02-28 17:31:58 -08:00
dmu_recv.c Skip memory allocation when compressing holes 2023-02-27 14:41:02 -08:00
dmu_redact.c Fix incorrect size given to bqueue_enqueue() call in dmu_redact.c 2022-09-15 16:21:21 -07:00
dmu_send.c Give strlcat() full buffer lengths rather than smaller buffer lengths 2023-02-14 11:03:42 -08:00
dmu_traverse.c arc_read()/arc_access() refactoring and cleanup 2022-12-22 12:10:24 -08:00
dmu_tx.c Add tunable to allow changing micro ZAP's max size 2023-01-10 13:41:54 -08:00
dmu_zfetch.c System-wide speculative prefetch limit. 2023-03-01 15:27:40 -08:00
dmu.c Use rw_tryupgrade() in dmu_bonus_hold_by_dnode() 2023-02-22 16:33:23 -08:00
dnode_sync.c free_blocks(): Fix reports from 2016 PVS Studio FreeBSD report 2023-01-23 13:12:37 -08:00
dnode.c Turn default_bs and default_ibs into ZFS_MODULE_PARAMs 2023-01-11 09:38:20 -08:00
dsl_bookmark.c Cleanup: Address Clang's static analyzer's unused code complaints 2022-10-14 13:37:54 -07:00
dsl_crypt.c Move dmu_buf_rele() after dsl_dataset_sync_done() 2023-02-23 18:14:52 -07:00
dsl_dataset.c Revert zfeature_active() to static 2023-02-28 14:03:52 -08:00
dsl_deadlist.c Move zap_attribute_t to the heap in dsl_deadlist_merge 2023-02-27 14:27:58 -08:00
dsl_deleg.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
dsl_destroy.c Prevent zevent list from consuming all of kernel memory 2022-08-22 12:36:22 -07:00
dsl_dir.c Cleanup ->dd_space_towrite should be unsigned 2023-01-20 11:10:15 -08:00
dsl_pool.c Move dmu_buf_rele() after dsl_dataset_sync_done() 2023-02-23 18:14:52 -07:00
dsl_prop.c Micro-optimize dsl_prop_get_dd() 2023-01-20 11:01:41 -08:00
dsl_scan.c Partially revert eee9362a7 2023-02-21 09:36:22 -08:00
dsl_synctask.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
dsl_userhold.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
edonr_zfs.c Remove bcopy(), bzero(), bcmp() 2022-03-15 15:13:42 -07:00
fm.c Cleanup of dead code suggested by Clang Static Analyzer (#14380) 2023-01-17 09:57:12 -08:00
gzip.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
hkdf.c Remove bcopy(), bzero(), bcmp() 2022-03-15 15:13:42 -07:00
lz4_zfs.c Updated the lz4 decompressor 2022-01-07 10:36:49 -08:00
lz4.c lz4: Cherrypick fix for CVE-2021-3520 2022-01-12 16:14:36 -08:00
lzjb.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
metaslab.c Bypass metaslab throttle for removal allocations 2022-12-09 10:48:33 -08:00
mmp.c Cleanup: Address Clang's static analyzer's unused code complaints 2022-10-14 13:37:54 -07:00
multilist.c Cleanup: Specify unsignedness on things that should not be signed 2022-09-27 16:42:41 -07:00
objlist.c Implement Redacted Send/Receive 2019-06-19 09:48:12 -07:00
pathname.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
range_tree.c Add defensive assertions 2022-10-12 11:25:18 -07:00
refcount.c Cleanup: Specify unsignedness on things that should not be signed 2022-09-27 16:42:41 -07:00
rrwlock.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
sa.c Suppress static analyzer warning in sa_attr_iter() 2023-02-28 17:31:30 -08:00
sha256.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
skein_zfs.c Remove bcopy(), bzero(), bcmp() 2022-03-15 15:13:42 -07:00
spa_checkpoint.c Cleanup: 64-bit kernel module parameters should use fixed width types 2022-10-13 10:03:29 -07:00
spa_config.c zed: add hotplug support for spare vdevs 2023-01-09 12:43:03 -08:00
spa_errlog.c deadlock between spa_errlog_lock and dp_config_rwlock 2022-12-22 11:48:49 -08:00
spa_history.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
spa_log_spacemap.c Address warnings about possible division by zero from clangsa 2022-11-03 09:58:14 -07:00
spa_misc.c Improve resilver ETAs 2023-01-25 11:28:54 -08:00
spa_stats.c Cleanup: Specify unsignedness on things that should not be signed 2022-09-27 16:42:41 -07:00
spa.c Sync thread should avoid holding the spa config write lock when possible 2023-02-16 14:10:52 -08:00
space_map.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
space_reftree.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -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
txg.c Fix the last two CFI callback prototype mismatches 2022-11-29 09:56:16 -08:00
uberblock.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
unique.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
vdev_cache.c Cleanup: Specify unsignedness on things that should not be signed 2022-09-27 16:42:41 -07:00
vdev_draid_rand.c Distributed Spare (dRAID) Feature 2020-11-13 13:51:51 -08:00
vdev_draid.c vdev_draid_lookup_map() should not iterate outside draid_maps 2022-09-12 12:51:17 -07:00
vdev_indirect_births.c Remove bcopy(), bzero(), bcmp() 2022-03-15 15:13:42 -07:00
vdev_indirect_mapping.c Remove bcopy(), bzero(), bcmp() 2022-03-15 15:13:42 -07:00
vdev_indirect.c Cleanup: Replace oldstyle struct hack with C99 flexible array members 2023-01-12 16:00:03 -08:00
vdev_initialize.c Cleanup: 64-bit kernel module parameters should use fixed width types 2022-10-13 10:03:29 -07:00
vdev_label.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
vdev_mirror.c Improve too large physical ashift handling 2022-09-08 10:30:53 -07:00
vdev_missing.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
vdev_queue.c Convert enum zio_flag to uint64_t 2022-10-27 09:54:54 -07:00
vdev_raidz_math_aarch64_neon_common.h Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
vdev_raidz_math_aarch64_neon.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
vdev_raidz_math_aarch64_neonx2.c Fix Clang 15 compilation errors 2022-11-30 13:46:26 -08:00
vdev_raidz_math_avx2.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
vdev_raidz_math_avx512bw.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
vdev_raidz_math_avx512f.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
vdev_raidz_math_impl.h Cleanup Raid-Z Typo fixes 2022-09-06 09:43:21 -07:00
vdev_raidz_math_powerpc_altivec_common.h Linux ppc64le ieee128 compat: Do not redefine __asm on external headers 2023-01-13 10:58:58 -08:00
vdev_raidz_math_powerpc_altivec.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
vdev_raidz_math_scalar.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
vdev_raidz_math_sse2.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
vdev_raidz_math_ssse3.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
vdev_raidz_math.c Convert some sprintf() calls to kmem_scnprintf() 2022-11-28 13:49:58 -08:00
vdev_raidz.c Bump checksum error counter before reporting to ZED 2022-12-02 17:42:22 -08:00
vdev_rebuild.c Increase default zfs_rebuild_vdev_limit to 64MB 2023-01-27 10:02:24 -08:00
vdev_removal.c Bypass metaslab throttle for removal allocations 2022-12-09 10:48:33 -08:00
vdev_root.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
vdev_trim.c Propagate extent_bytes change to autotrim thread 2022-10-28 10:16:31 -07:00
vdev.c Configure zed's diagnosis engine with vdev properties 2023-01-23 13:14:25 -08:00
zap_leaf.c Optimize microzaps 2022-10-20 11:57:15 -07:00
zap_micro.c Add tunable to allow changing micro ZAP's max size 2023-01-10 13:41:54 -08:00
zap.c Cleanup: Use NULL when doing NULL pointer comparisons 2023-01-12 16:00:37 -08:00
zcp_get.c Cleanup: Address Clang's static analyzer's unused code complaints 2022-10-14 13:37:54 -07:00
zcp_global.c OpenZFS 8600 - ZFS channel programs - snapshot 2018-02-08 15:29:24 -08:00
zcp_iter.c module/*.ko: prune .data, global .rodata 2022-01-14 15:37:55 -08:00
zcp_set.c Support setting user properties in a channel program 2020-02-14 13:41:42 -08:00
zcp_synctask.c Add zfs.sync.snapshot_rename 2022-09-02 13:31:19 -07:00
zcp.c ztest: update ztest_dmu_snapshot_create_destroy() 2023-01-10 13:27:48 -08:00
zfeature.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
zfs_byteswap.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
zfs_chksum.c Cleanup: Remove unnecessary explicit casts of pointers from allocators 2023-01-12 15:59:12 -08:00
zfs_fm.c Configure zed's diagnosis engine with vdev properties 2023-01-23 13:14:25 -08:00
zfs_fuid.c Cleanup: Remove unneeded semicolons 2023-01-12 16:00:30 -08:00
zfs_ioctl.c Remove bad kmem_free() oversight from previous zfsdev_state_list patch 2023-03-01 13:20:53 -08:00
zfs_log.c zfs_rename: support RENAME_* flags 2022-10-28 09:49:20 -07:00
zfs_onexit.c zfs_onexit_add_cb: make action_handle point to a uintptr_t 2022-11-03 09:52:12 -07:00
zfs_quota.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
zfs_ratelimit.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
zfs_replay.c Suppress Clang static analyzer complaint in zfs_replay_create() 2023-02-14 11:05:41 -08:00
zfs_rlock.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
zfs_sa.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
zfs_vnops.c Linux: use filemap_range_has_page() 2023-02-14 11:04:34 -08:00
zil.c Fix data race between zil_commit() and zil_suspend() 2023-03-01 13:23:09 -08:00
zio_checksum.c Suppress static analyzer warnings in zio_checksum_error_impl() 2023-02-28 17:31:08 -08:00
zio_compress.c Skip memory allocation when compressing holes 2023-02-27 14:41:02 -08:00
zio_inject.c Cleanup: Switch to strlcpy from strncpy 2022-09-27 16:35:29 -07:00
zio.c Skip memory allocation when compressing holes 2023-02-27 14:41:02 -08:00
zle.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
zrlock.c Micro-optimize zrl_remove() 2022-11-29 09:26:03 -08:00
zthr.c Switch from _Noreturn to __attribute__((noreturn)) 2022-03-23 08:51:00 -07:00
zvol.c Cleanup of dead code suggested by Clang Static Analyzer (#14380) 2023-01-17 09:57:12 -08:00