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zfs-2.4-release
zfs/include/os/linux/spl/sys
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Paul Dagnelie df55ba7c49 Detect a slow raidz child during reads 
A single slow responding disk can affect the overall read
performance of a raidz group.  When a raidz child disk is
determined to be a persistent slow outlier, then have it
sit out during reads for a period of time. The raidz group
can use parity to reconstruct the data that was skipped.

Each time a slow disk is placed into a sit out period, its
`vdev_stat.vs_slow_ios count` is incremented and a zevent
class `ereport.fs.zfs.delay` is posted.

The length of the sit out period can be changed using the
`raid_read_sit_out_secs` module parameter.  Setting it to
zero disables slow outlier detection.

Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Paul Dagnelie <paul.dagnelie@klarasystems.com>
Contributions-by: Don Brady <don.brady@klarasystems.com>
Contributions-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #17227
2025-09-10 15:31:30 -07:00
..
ia32 SPDX: license tags: CDDL-1.0 2025-03-13 17:56:27 -07:00
acl.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
atomic.h linux/atomic: fill out API for atomic pointer ops 2025-07-31 15:51:47 -07:00
byteorder.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
callb.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
callo.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
cmn_err.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
condvar.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
cred.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
ctype.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
debug.h ZIL: allow zil_commit() to fail with error 2025-08-08 16:43:09 -07:00
disp.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
errno.h SPDX: license tags: CDDL-1.0 2025-03-13 17:56:27 -07:00
fcntl.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
file.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
inttypes.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
isa_defs.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
kmem_cache.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
kmem.h linux/kmem: remove HAVE_ATOMIC64_T and kmem_alloc_used wrappers 2025-07-22 15:08:07 -07:00
kstat.h linux/kstat: allow multi-level module names 2025-03-20 16:24:50 -07:00
list.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
misc.h Skip dbuf_evict_one() from dbuf_evict_notify() for reclaim thread 2025-08-01 16:47:41 -07:00
mod.h mod.h: make consistent across all three platforms 2025-07-15 15:46:14 -07:00
mutex.h Prefer VERIFY0P(n) over VERIFY3P(n, ==, NULL) 2025-08-07 11:41:42 -07:00
param.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
proc.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
processor.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
procfs_list.h SPDX: license tags: CDDL-1.0 2025-03-13 17:56:27 -07:00
random.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
rwlock.h linux/rw_destroy: assert no holders before destroying 2025-09-10 15:01:02 -07:00
shrinker.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
sid.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
signal.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
simd.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
stat.h linux: use sys/stat.h instead of linux/stat.h 2025-09-09 17:04:15 -07:00
string.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
sunddi.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
sysmacros.h spa: ZIO_TASKQ_ISSUE: Use symbolic priority 2025-06-30 10:24:23 -04:00
systeminfo.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
taskq.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
thread.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
time.h Detect a slow raidz child during reads 2025-09-10 15:31:30 -07:00
timer.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
trace_spl.h SPDX: license tags: CDDL-1.0 2025-03-13 17:56:27 -07:00
trace_taskq.h SPDX: license tags: CDDL-1.0 2025-03-13 17:56:27 -07:00
trace.h SPDX: license tags: CDDL-1.0 2025-03-13 17:56:27 -07:00
tsd.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
types32.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
types.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
uio.h linux/uio: remove "skip" offset for UIO_ITER 2025-05-11 12:46:40 -04:00
user.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
vfs.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
vmem.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
vmsystm.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
vnode.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
wait.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
wmsum.h SPDX: license tags: CDDL-1.0 2025-03-13 17:56:27 -07:00
zmod.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00
zone.h SPDX: license tags: GPL-2.0-or-later 2025-03-13 17:57:09 -07:00