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4c856fb333
openzfsonwindows/openzfs#206 found that it is possible to trip `VERIFY(list_is_empty(&lwb->lwb_itxs))` when a `zil_commit()` is delayed by the scheduler long enough for a parallel `zil_suspend()` operation to exit `zil_commit_impl()`. This is a data race. To prevent this, we introduce a `zilog->zl_suspend_lock` rwlock to ensure that all outstanding `zil_commit()` operations finish before `zil_suspend()` begins and that subsequent operations fallback to `txg_wait_synced()` after `zil_suspend()` has begun. On `PREEMPT_RT` Linux kernels, the `rw_enter()` implementation suffers from writer starvation. This means that a ZIL intensive system can delay `zil_suspend()` indefinitely. This is a pre-existing problem that affects everything that uses rw locks, so it needs to be addressed in the SPL. However, builds against `PREEMPT_RT` Linux kernels are currently broken due to a GPL symbol issue (#11097), so we can safely disregard that issue for now. Reported-by: Arun KV <arun.kv@datacore.com> Reviewed-by: Alexander Motin <mav@FreeBSD.org> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Richard Yao <richard.yao@alumni.stonybrook.edu> Closes #14514 |
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| os | ||
| sys | ||
| .gitignore | ||
| cityhash.h | ||
| libnvpair.h | ||
| libuutil_common.h | ||
| libuutil_impl.h | ||
| libuutil.h | ||
| libzfs_core.h | ||
| libzfs.h | ||
| libzfsbootenv.h | ||
| libzutil.h | ||
| Makefile.am | ||
| thread_pool.h | ||
| zfeature_common.h | ||
| zfs_comutil.h | ||
| zfs_deleg.h | ||
| zfs_fletcher.h | ||
| zfs_namecheck.h | ||
| zfs_prop.h | ||