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Fix MMP write frequency for large pools #7289

Merged
merged 1 commit into from
Mar 12, 2018
Merged

Fix MMP write frequency for large pools #7289

merged 1 commit into from
Mar 12, 2018

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behlendorf
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Description

When a single pool contains more vdevs than the CONFIG_HZ for for the kernel the mmp thread will not delay properly. Switch to using cv_timedwait_sig_hires() to handle higher resolution delays.

This issue was reported on Arch Linux where HZ defaults to only 100 and thus could be fairly easily reproduced with a reasonably large pool. Most distribution kernels set CONFIG_HZ=250 or CONFIG_HZ=1000 thus are unlikely to be impacted.

Motivation and Context

Issue #7205

How Has This Been Tested?

Locally created a pool with 2000 vdevs on a system with CONFIG_HZ=1000, enabled multihost and observed an IO rate of ~2000 IO/s (one per-vdev per second). With out the patch the mmp thread would spin.

Types of changes

  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Performance enhancement (non-breaking change which improves efficiency)
  • Code cleanup (non-breaking change which makes code smaller or more readable)
  • Breaking change (fix or feature that would cause existing functionality to change)
  • Documentation (a change to man pages or other documentation)

Checklist:

  • My code follows the ZFS on Linux code style requirements.
  • I have updated the documentation accordingly.
  • I have read the CONTRIBUTING document.
  • I have added tests to cover my changes.
  • All new and existing tests passed.
  • All commit messages are properly formatted and contain Signed-off-by.
  • Change has been approved by a ZFS on Linux member.

@behlendorf
Fix MMP write frequency for large pools
514af1a 
When a single pool contains more vdevs than the CONFIG_HZ for
for the kernel the mmp thread will not delay properly.  Switch
to using cv_timedwait_sig_hires() to handle higher resolution
delays.

This issue was reported on Arch Linux where HZ defaults to only
100 and thus could be fairly easily reproduced with a reasonably
large pool.  Most distribution kernels set CONFIG_HZ=250 or
CONFIG_HZ=1000 thus are unlikely to be impacted.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue openzfs#7205
@behlendorf behlendorf requested a review from ofaaland March 9, 2018 23:33
@behlendorf behlendorf mentioned this pull request Mar 9, 2018
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@behlendorf
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@tonyhutter @ofaaland we should also consider this one for 0.7.7.

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codecov bot commented Mar 10, 2018 •
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Codecov Report

Merging #7289 into master will decrease coverage by 0.1%.
The diff coverage is 100%.

Impacted file tree graph

@@            Coverage Diff             @@
##           master    #7289      +/-   ##
==========================================
- Coverage    76.5%    76.4%   -0.11%     
==========================================
  Files         328      328              
  Lines      104005   104005              
==========================================
- Hits        79572    79461     -111     
- Misses      24433    24544     +111
Flag Coverage Δ
#kernel 76.41% <100%> (-0.07%) ⬇️
#user 65.69% <100%> (-0.22%) ⬇️

Continue to review full report at Codecov.

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ofaaland
ofaaland approved these changes Mar 12, 2018
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Good find!

@behlendorf behlendorf merged commit b7eec00 into openzfs:master Mar 12, 2018
tonyhutter pushed a commit to tonyhutter/zfs that referenced this pull request Mar 12, 2018
@behlendorf @tonyhutter
Fix MMP write frequency for large pools
9952146 
When a single pool contains more vdevs than the CONFIG_HZ for
for the kernel the mmp thread will not delay properly.  Switch
to using cv_timedwait_sig_hires() to handle higher resolution
delays.

This issue was reported on Arch Linux where HZ defaults to only
100 and this could be fairly easily reproduced with a reasonably
large pool.  Most distribution kernels set CONFIG_HZ=250 or
CONFIG_HZ=1000 and thus are unlikely to be impacted.

Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Reviewed-by: Olaf Faaland <faaland1@llnl.gov>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes openzfs#7205 
Closes openzfs#7289
tonyhutter pushed a commit to tonyhutter/zfs that referenced this pull request Mar 12, 2018
@behlendorf @tonyhutter
Fix MMP write frequency for large pools
88f792c 
When a single pool contains more vdevs than the CONFIG_HZ for
for the kernel the mmp thread will not delay properly.  Switch
to using cv_timedwait_sig_hires() to handle higher resolution
delays.

This issue was reported on Arch Linux where HZ defaults to only
100 and this could be fairly easily reproduced with a reasonably
large pool.  Most distribution kernels set CONFIG_HZ=250 or
CONFIG_HZ=1000 and thus are unlikely to be impacted.

Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Reviewed-by: Olaf Faaland <faaland1@llnl.gov>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes openzfs#7205
Closes openzfs#7289
tonyhutter pushed a commit to tonyhutter/zfs that referenced this pull request Mar 13, 2018
@behlendorf @tonyhutter
Fix MMP write frequency for large pools
a248ba3 
When a single pool contains more vdevs than the CONFIG_HZ for
for the kernel the mmp thread will not delay properly.  Switch
to using cv_timedwait_sig_hires() to handle higher resolution
delays.

This issue was reported on Arch Linux where HZ defaults to only
100 and this could be fairly easily reproduced with a reasonably
large pool.  Most distribution kernels set CONFIG_HZ=250 or
CONFIG_HZ=1000 and thus are unlikely to be impacted.

Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Reviewed-by: Olaf Faaland <faaland1@llnl.gov>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes openzfs#7205
Closes openzfs#7289
tonyhutter pushed a commit to tonyhutter/zfs that referenced this pull request Mar 13, 2018
@ryao @tonyhutter
zfs-0.7.7 squashed patchset
7852832 
This is a squashed patchset for zfs-0.7.7.  The individual commits are
in the tonyhutter:zfs-0.7.7-hutter branch.  I squashed the commits so
that buildbot wouldn't have to run against each one, and because
github/builbot seem to have a maximum limit of 30 commits they can
test from a PR.

- Fix MMP write frequency for large pools openzfs#7205 openzfs#7289
- Handle zio_resume and mmp => off openzfs#7286
- Fix zfs-kmod builds when using rpm >= 4.14 openzfs#7284
- zdb and inuse tests don't pass with real disks openzfs#6939 openzfs#7261
- Take user namespaces into account in policy checks openzfs#6800 openzfs#7270
- Detect long config lock acquisition in mmp openzfs#7212
- Linux 4.16 compat: get_disk_and_module() openzfs#7264
- Change checksum & IO delay ratelimit values openzfs#7252
- Increment zil_itx_needcopy_bytes properly openzfs#6988 openzfs#7176
- Fix some typos openzfs#7237
- Fix zpool(8) list example to match actual format openzfs#7244
- Add SMART self-test results to zpool status -c openzfs#7178
- Add scrub after resilver zed script openzfs#4662 openzfs#7086
- Fix free memory calculation on v3.14+ openzfs#7170
- Report duration and error in mmp_history entries openzfs#7190
- Do not initiate MMP writes while pool is suspended openzfs#7182
- Linux 4.16 compat: use correct *_dec_and_test()
- Allow modprobe to fail when called within systemd openzfs#7174
- Add SMART attributes for SSD and NVMe openzfs#7183 openzfs#7193
- Correct count_uberblocks in mmp.kshlib openzfs#7191
- Fix config issues: frame size and headers openzfs#7169
- Clarify zinject(8) explanation of -e openzfs#7172
- OpenZFS 8857 - zio_remove_child() panic due to already destroyed parent zio openzfs#7168
- 'zfs receive' fails with "dataset is busy" openzfs#7129 openzfs#7154
- contrib/initramfs: add missing conf.d/zfs openzfs#7158
- mmp should use a fixed tag for spa_config locks openzfs#6530 openzfs#7155
- Handle zap_add() failures in mixed case mode openzfs#7011 openzfs#7054
- Fix zdb -ed on objset for exported pool openzfs#7099 openzfs#6464
- Fix zdb -E segfault openzfs#7099
- Fix zdb -R decompression openzfs#7099 openzfs#4984
- Fix racy assignment of zcb.zcb_haderrors openzfs#7099
- Fix zle_decompress out of bound access openzfs#7099
- Fix zdb -c traverse stop on damaged objset root openzfs#7099
- Linux 4.11 compat: avoid refcount_t name conflict openzfs#7148
- Linux 4.16 compat: inode_set_iversion() openzfs#7148
- OpenZFS 8966 - Source file zfs_acl.c, function zfs_aclset_common contains a use after end of the lifetime of a local variable openzfs#7141
- Remove deprecated zfs_arc_p_aggressive_disable openzfs#7135
- Fix default libdir for Debian/Ubuntu openzfs#7083 openzfs#7101
- Bug fix in qat_compress.c for vmalloc addr check openzfs#7125
- Fix systemd_ RPM macros usage on Debian-based distributions openzfs#7074 openzfs#7100
- Emit an error message before MMP suspends pool openzfs#7048
- ZTS: Fix create-o_ashift test case openzfs#6924 openzfs#6977
- Fix --with-systemd on Debian-based distributions (openzfs#6963) openzfs#6591 openzfs#6963
- Remove vn_rename and vn_remove dependency openzfs/spl#648 openzfs#6753
- Add support for "--enable-code-coverage" option openzfs#6670
- Make "-fno-inline" compile option more accessible openzfs#6605
- Add configure option to enable gcov analysis openzfs#6642
- Implement --enable-debuginfo to force debuginfo openzfs#2734
- Make --enable-debug fail when given bogus args openzfs#2734

Signed-off-by: Tony Hutter <hutter2@llnl.gov>
Requires-spl: refs/pull/690/head
@tonyhutter tonyhutter mentioned this pull request Mar 13, 2018
Closed
13 tasks
tonyhutter pushed a commit to tonyhutter/zfs that referenced this pull request Mar 13, 2018
@ryao @tonyhutter
zfs-0.7.7 squashed patchset
6e7b286 
This is a squashed patchset for zfs-0.7.7.  The individual commits are
in the tonyhutter:zfs-0.7.7-hutter branch.  I squashed the commits so
that buildbot wouldn't have to run against each one, and because
github/builbot seem to have a maximum limit of 30 commits they can
test from a PR.

- Fix MMP write frequency for large pools openzfs#7205 openzfs#7289
- Handle zio_resume and mmp => off openzfs#7286
- Fix zfs-kmod builds when using rpm >= 4.14 openzfs#7284
- zdb and inuse tests don't pass with real disks openzfs#6939 openzfs#7261
- Take user namespaces into account in policy checks openzfs#6800 openzfs#7270
- Detect long config lock acquisition in mmp openzfs#7212
- Linux 4.16 compat: get_disk_and_module() openzfs#7264
- Change checksum & IO delay ratelimit values openzfs#7252
- Increment zil_itx_needcopy_bytes properly openzfs#6988 openzfs#7176
- Fix some typos openzfs#7237
- Fix zpool(8) list example to match actual format openzfs#7244
- Add SMART self-test results to zpool status -c openzfs#7178
- Add scrub after resilver zed script openzfs#4662 openzfs#7086
- Fix free memory calculation on v3.14+ openzfs#7170
- Report duration and error in mmp_history entries openzfs#7190
- Do not initiate MMP writes while pool is suspended openzfs#7182
- Linux 4.16 compat: use correct *_dec_and_test()
- Allow modprobe to fail when called within systemd openzfs#7174
- Add SMART attributes for SSD and NVMe openzfs#7183 openzfs#7193
- Correct count_uberblocks in mmp.kshlib openzfs#7191
- Fix config issues: frame size and headers openzfs#7169
- Clarify zinject(8) explanation of -e openzfs#7172
- OpenZFS 8857 - zio_remove_child() panic due to already destroyed
  parent zio openzfs#7168
- 'zfs receive' fails with "dataset is busy" openzfs#7129 openzfs#7154
- contrib/initramfs: add missing conf.d/zfs openzfs#7158
- mmp should use a fixed tag for spa_config locks openzfs#6530 openzfs#7155
- Handle zap_add() failures in mixed case mode openzfs#7011 openzfs#7054
- Fix zdb -ed on objset for exported pool openzfs#7099 openzfs#6464
- Fix zdb -E segfault openzfs#7099
- Fix zdb -R decompression openzfs#7099 openzfs#4984
- Fix racy assignment of zcb.zcb_haderrors openzfs#7099
- Fix zle_decompress out of bound access openzfs#7099
- Fix zdb -c traverse stop on damaged objset root openzfs#7099
- Linux 4.11 compat: avoid refcount_t name conflict openzfs#7148
- Linux 4.16 compat: inode_set_iversion() openzfs#7148
- OpenZFS 8966 - Source file zfs_acl.c, function zfs_aclset_common
  contains a use after end of the lifetime of a local variable openzfs#7141
- Remove deprecated zfs_arc_p_aggressive_disable openzfs#7135
- Fix default libdir for Debian/Ubuntu openzfs#7083 openzfs#7101
- Bug fix in qat_compress.c for vmalloc addr check openzfs#7125
- Fix systemd_ RPM macros usage on Debian-based distributions openzfs#7074
  openzfs#7100
- Emit an error message before MMP suspends pool openzfs#7048
- ZTS: Fix create-o_ashift test case openzfs#6924 openzfs#6977
- Fix --with-systemd on Debian-based distributions (openzfs#6963) openzfs#6591 openzfs#6963
- Remove vn_rename and vn_remove dependency openzfs/spl#648 openzfs#6753
- Add support for "--enable-code-coverage" option openzfs#6670
- Make "-fno-inline" compile option more accessible openzfs#6605
- Add configure option to enable gcov analysis openzfs#6642
- Implement --enable-debuginfo to force debuginfo openzfs#2734
- Make --enable-debug fail when given bogus args openzfs#2734

Signed-off-by: Tony Hutter <hutter2@llnl.gov>
Requires-spl: refs/pull/690/head
tonyhutter pushed a commit to tonyhutter/zfs that referenced this pull request Mar 13, 2018
@behlendorf @tonyhutter
Fix MMP write frequency for large pools
2bcd42e 
When a single pool contains more vdevs than the CONFIG_HZ for
for the kernel the mmp thread will not delay properly.  Switch
to using cv_timedwait_sig_hires() to handle higher resolution
delays.

This issue was reported on Arch Linux where HZ defaults to only
100 and this could be fairly easily reproduced with a reasonably
large pool.  Most distribution kernels set CONFIG_HZ=250 or
CONFIG_HZ=1000 and thus are unlikely to be impacted.

Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Reviewed-by: Olaf Faaland <faaland1@llnl.gov>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes openzfs#7205
Closes openzfs#7289
tonyhutter pushed a commit to tonyhutter/zfs that referenced this pull request Mar 13, 2018
@ryao @tonyhutter
zfs-0.7.7 squashed patchset
fe5d27a 
This is a squashed patchset for zfs-0.7.7.  The individual commits are
in the tonyhutter:zfs-0.7.7-hutter branch.  I squashed the commits so
that buildbot wouldn't have to run against each one, and because
github/builbot seem to have a maximum limit of 30 commits they can
test from a PR.

- Fix MMP write frequency for large pools openzfs#7205 openzfs#7289
- Handle zio_resume and mmp => off openzfs#7286
- Fix zfs-kmod builds when using rpm >= 4.14 openzfs#7284
- zdb and inuse tests don't pass with real disks openzfs#6939 openzfs#7261
- Take user namespaces into account in policy checks openzfs#6800 openzfs#7270
- Detect long config lock acquisition in mmp openzfs#7212
- Linux 4.16 compat: get_disk_and_module() openzfs#7264
- Change checksum & IO delay ratelimit values openzfs#7252
- Increment zil_itx_needcopy_bytes properly openzfs#6988 openzfs#7176
- Fix some typos openzfs#7237
- Fix zpool(8) list example to match actual format openzfs#7244
- Add SMART self-test results to zpool status -c openzfs#7178
- Add scrub after resilver zed script openzfs#4662 openzfs#7086
- Fix free memory calculation on v3.14+ openzfs#7170
- Report duration and error in mmp_history entries openzfs#7190
- Do not initiate MMP writes while pool is suspended openzfs#7182
- Linux 4.16 compat: use correct *_dec_and_test()
- Allow modprobe to fail when called within systemd openzfs#7174
- Add SMART attributes for SSD and NVMe openzfs#7183 openzfs#7193
- Correct count_uberblocks in mmp.kshlib openzfs#7191
- Fix config issues: frame size and headers openzfs#7169
- Clarify zinject(8) explanation of -e openzfs#7172
- OpenZFS 8857 - zio_remove_child() panic due to already destroyed
  parent zio openzfs#7168
- 'zfs receive' fails with "dataset is busy" openzfs#7129 openzfs#7154
- contrib/initramfs: add missing conf.d/zfs openzfs#7158
- mmp should use a fixed tag for spa_config locks openzfs#6530 openzfs#7155
- Handle zap_add() failures in mixed case mode openzfs#7011 openzfs#7054
- Fix zdb -ed on objset for exported pool openzfs#7099 openzfs#6464
- Fix zdb -E segfault openzfs#7099
- Fix zdb -R decompression openzfs#7099 openzfs#4984
- Fix racy assignment of zcb.zcb_haderrors openzfs#7099
- Fix zle_decompress out of bound access openzfs#7099
- Fix zdb -c traverse stop on damaged objset root openzfs#7099
- Linux 4.11 compat: avoid refcount_t name conflict openzfs#7148
- Linux 4.16 compat: inode_set_iversion() openzfs#7148
- OpenZFS 8966 - Source file zfs_acl.c, function zfs_aclset_common
  contains a use after end of the lifetime of a local variable openzfs#7141
- Remove deprecated zfs_arc_p_aggressive_disable openzfs#7135
- Fix default libdir for Debian/Ubuntu openzfs#7083 openzfs#7101
- Bug fix in qat_compress.c for vmalloc addr check openzfs#7125
- Fix systemd_ RPM macros usage on Debian-based distributions openzfs#7074
  openzfs#7100
- Emit an error message before MMP suspends pool openzfs#7048
- ZTS: Fix create-o_ashift test case openzfs#6924 openzfs#6977
- Fix --with-systemd on Debian-based distributions (openzfs#6963) openzfs#6591 openzfs#6963
- Remove vn_rename and vn_remove dependency openzfs/spl#648 openzfs#6753
- Fix "--enable-code-coverage" debug build openzfs#6674
- Update codecov.yml openzfs#6669
- Add support for "--enable-code-coverage" option openzfs#6670
- Make "-fno-inline" compile option more accessible openzfs#6605
- Add configure option to enable gcov analysis openzfs#6642
- Implement --enable-debuginfo to force debuginfo openzfs#2734
- Make --enable-debug fail when given bogus args openzfs#2734

Signed-off-by: Tony Hutter <hutter2@llnl.gov>
Requires-spl: refs/pull/690/head
tonyhutter pushed a commit that referenced this pull request Mar 19, 2018
@behlendorf @tonyhutter
Fix MMP write frequency for large pools
c30e716 
When a single pool contains more vdevs than the CONFIG_HZ for
for the kernel the mmp thread will not delay properly.  Switch
to using cv_timedwait_sig_hires() to handle higher resolution
delays.

This issue was reported on Arch Linux where HZ defaults to only
100 and this could be fairly easily reproduced with a reasonably
large pool.  Most distribution kernels set CONFIG_HZ=250 or
CONFIG_HZ=1000 and thus are unlikely to be impacted.

Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Reviewed-by: Olaf Faaland <faaland1@llnl.gov>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #7205
Closes #7289
@behlendorf behlendorf mentioned this pull request May 23, 2018
Closed
@behlendorf behlendorf deleted the issue-7205 branch April 19, 2021 19:30
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@tonyhutter tonyhutter tonyhutter approved these changes

@ofaaland ofaaland ofaaland approved these changes

@gmelikov gmelikov gmelikov approved these changes

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