Repartition data after loading IO class configuration#881
Repartition data after loading IO class configuration#881Deixx wants to merge 3 commits intoOpen-CAS:masterfrom
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| part_id = ocf_metadata_get_partition_id(cache, cline); | ||
| part = &cache->user_parts[part_id].part; | ||
| part = &cache->user_parts[node->partition_id].part; |
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I think this change belongs to the previous commit :)
| list = ocf_lru_get_list(part, curr_lru, iter->clean); | ||
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| cline = list->tail; | ||
| while (cline != end_marker && !ocf_cache_line_try_lock_wr( |
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This functions won't repart all cache lines because of this try_lock(). It will only repart the cache lines that is was able to lock. Any CL that would be locked by a concurrent IO request won't be reparted
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I assumed that if there is only the default IO class active then those cache lines which can't be locked would be reparted as a result of this concurrent IO.
| if (metadata_test_dirty(cache, cline)) | ||
| ocf_cleaning_purge_cache_block(cache, cline); | ||
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| ocf_lru_repart_locked(cache, cline, part, dst_part); |
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I don't think ocf_lru_repart_locked() is a good fit for repartition during a managment operation because every reparted cache line will be marked as hot and will trigger unnecessary rebalancing on the default ioclass.
src/mngt/ocf_mngt_io_class.c
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| _ocf_mngt_set_partition_size(cache, i, 0, 0); | ||
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| for (i = 1; i < OCF_USER_IO_CLASS_MAX; i++) { | ||
| ocf_lru_repart_all(cache, |
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Why do we need to repart all ioclasses? If the IO class configuration has changed shouldn't we repart only the partitions that has been disabled?
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The 3rd commit in this PR adds an optional parameter that decides whether only non-active or all partitions should undergo the process.
Signed-off-by: Daniel Madej <daniel.madej@huawei.com>
Signed-off-by: Daniel Madej <daniel.madej@huawei.com>
With `all` parameter set repartition data from all IO classes. If `all` is unset repartition only from deleted IO classes. Signed-off-by: Daniel Madej <daniel.madej@huawei.com>
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