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scoutfs/kmod
Zach Brown 1259f899a3 srch compaction needs to prepare alloc for commit
The srch client compaction work initializes allocators, dirties blocks,
and writes them out as its transaction.  It forgot to call the
pre-commit allocator prepare function.

The prepare function drops block references used by the meta allocator
during the transaction.  This leaked block references which kept blocks
from being freed by the shrinker under memory pressure.  Eventually
memory was full of leaked blocks and the shrinker walked all of them
looking blocks to free, resulting in an effective livelock that ground
the system to a crawl.

Signed-off-by: Zach Brown <zab@versity.com>
2021-04-01 13:04:40 -07:00
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