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mirror_zfs/module/os/linux/spl
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Rich Ercolani 35a6247c5f
Add a delay to tearing down threads. 
It's been observed that in certain workloads (zvol-related being a
big one), ZFS will end up spending a large amount of time spinning
up taskqs only to tear them down again almost immediately, then
spin them up again...

I noticed this when I looked at what my mostly-idle system was doing
and wondered how on earth taskq creation/destroy was a bunch of time...

So I added a configurable delay to avoid it tearing down tasks the
first time it notices them idle, and the total number of threads at
steady state went up, but the amount of time being burned just
tearing down/turning up new ones almost vanished.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rich Ercolani <rincebrain@gmail.com>
Closes #14938
2023-06-26 13:57:12 -07:00
..
README.md Replace ZFS on Linux references with OpenZFS 2020-10-08 20:10:13 -07:00
spl-atomic.c Replace ZFS on Linux references with OpenZFS 2020-10-08 20:10:13 -07:00
spl-condvar.c Fix declarations of non-global variables 2022-10-18 11:05:32 -07:00
spl-cred.c Linux 6.3 compat: idmapped mount API changes 2023-04-10 14:15:36 -07:00
spl-err.c Fix declarations of non-global variables 2022-10-18 11:05:32 -07:00
spl-generic.c Linux: Fix octal detection in define_ddi_strtox() 2023-03-08 13:52:09 -08:00
spl-kmem-cache.c Linux: Never sleep in kmem_cache_alloc(..., KM_NOSLEEP) (#14926) 2023-06-07 10:43:43 -07:00
spl-kmem.c Clean up CSTYLEDs 2022-01-26 11:38:52 -08:00
spl-kstat.c Cleanup: Switch to strlcpy from strncpy 2022-09-27 16:35:29 -07:00
spl-proc.c Clean up CSTYLEDs 2022-01-26 11:38:52 -08:00
spl-procfs-list.c Linux 6.1 compat: change order of sys/mutex.h includes 2022-10-18 12:29:44 -07:00
spl-taskq.c Add a delay to tearing down threads. 2023-06-26 13:57:12 -07:00
spl-thread.c Cleanup of dead code suggested by Clang Static Analyzer (#14380) 2023-01-17 09:57:12 -08:00
spl-trace.c Replace dead opensolaris.org license link 2022-07-11 14:16:13 -07:00
spl-tsd.c Linux SPL module init: Handle memory allocation failures correctly 2022-09-08 10:28:20 -07:00
spl-vmem.c Replace ZFS on Linux references with OpenZFS 2020-10-08 20:10:13 -07:00
spl-xdr.c module/*.ko: prune .data, global .rodata 2022-01-14 15:37:55 -08:00
spl-zlib.c Linux SPL module init: Handle memory allocation failures correctly 2022-09-08 10:28:20 -07:00
spl-zone.c Cleanup: Use C99 flexible array members instead of zero length arrays 2023-01-12 15:59:41 -08:00
THIRDPARTYLICENSE.gplv2 OpenZFS restructuring - move platform specific sources 2019-09-06 11:26:26 -07:00
THIRDPARTYLICENSE.gplv2.descrip OpenZFS restructuring - move platform specific sources 2019-09-06 11:26:26 -07:00

README.md

The Solaris Porting Layer, SPL, is a Linux kernel module which provides a compatibility layer used by the OpenZFS project.

Installation

The latest version of the SPL is maintained as part of this repository. Only when building ZFS version 0.7.x or earlier must an external SPL release be used. These releases can be found at:

Release

The SPL is released under a GPLv2 license.
For more details see the NOTICE and THIRDPARTYLICENSE files; UCRL-CODE-235197