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8e85164e7ddoc: release note on mempool size in -blocksonly (willcl-ark)ae797463dcdoc: Update blocksonly behaviour in reduce-memory (willcl-ark)1134686ef9mempool: Don't share mempool with dbcache in blocksonly (willcl-ark) Pull request description: Fixes #9526 When `-blocksonly` has been set reduce default mempool size to avoid surprising resource usage via sharing un-used mempool cache space with dbcache. In comparison to https://github.com/bitcoin/bitcoin/pull/9569 which either set `maxmempool` size to 0 when `-blocksonly` was set or else errored on startup, this change will permit `maxmempool` options being set. This preserves the current (surprising?) behaviour of having a functional mempool in `-blocksonly` mode, to permit whitelisted peer transaction relay, whilst reducing average runtime memory usage for blocksonly nodes which either use the default settings or have otherwise configured a `maxmempool` size. To use the previous old defaults node operators can configure their node with: `-blocksonly -maxmempool=300`. ACKs for top commit: ajtowns: ACK8e85164e7dstickies-v: re-ACK8e85164e7dTree-SHA512: 1c461c24b6f14ba02cfe4e2cde60dc629e47485db5701bca3003b8df79e3aa311c0c967979f6a1dca3ba69f5b1e45fa2db6ff83352fdf2d4349d5f8d120e740d