CI tests for combined #16722 and #16040 #16744
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..., before we make the header or the log block visible to others. It should fix assertion on allocated space going negative if the header is freed once the lock is dropped, while the write is still going. Signed-off-by: Alexander Motin <[email protected]> Sponsored by: iXsystems, Inc. Fixes openzfs#16040
dsl_free() calls zio_free() to free the block. For most blocks, this simply calls metaslab_free() without doing any IO or putting anything on the IO pipeline. Some blocks however require additional IO to free. This at least includes gang, dedup and cloned blocks. For those, zio_free() will issue a ZIO_TYPE_FREE IO and return. If a huge number of blocks are being freed all at once, it's possible for dsl_dataset_block_kill() to be called millions of time on a single transaction (eg a 2T object of 128K blocks is 16M blocks). If those are all IO-inducing frees, that then becomes 16M FREE IOs placed on the pipeline. At time of writing, a zio_t is 1280 bytes, so for just one 2T object that requires a 20G allocation of resident memory from the zio_cache. If that can't be satisfied by the kernel, an out-of-memory condition is raised. This would be better handled by improving the cases that the dmu_tx_assign() throttle will handle, or by reducing the overheads required by the IO pipeline, or with a better central facility for freeing blocks. For now, we simply check for the cases that would cause zio_free() to create a FREE IO, and instead put the block on the pool's freelist. This is the same place that blocks from destroyed datasets go, and the async destroy machinery will automatically see them and trickle them out as normal. Sponsored-by: Klara, Inc. Sponsored-by: Wasabi Technology, Inc. Signed-off-by: Rob Norris <[email protected]>
13 tasks
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None of the tests failed on the L2ARC issue. Restarted the failed ones for another try. |
13 tasks
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Motivation and Context
Verify using the CI that #16743 does resolve the accounting ASSERT
race which was uncovered by the change in #16722.
After the CI verifies we're no long able to hit the ASSERT with both
changes applied we can merge the component PRs and close this one.
Description
See #16722 and #16743
How Has This Been Tested?
Will be testing by the CI.
Types of changes