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osd: reduce buffer pinning from EC entries #15120
This is targeting the right areas in the code based on valgrind and heap profiling data. Prior to the change, OSDs were consuming around 6GB RSS after 7 minutes of random writes to an RBD volume on an EC4+2 pool with 1024 PGs spread across 16 NVMe backed bluestore OSDs. After the change, tests on a new cluster with the same a parameters showed roughly 3.5GB RSS used per OSD.