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9e9190154e
Arrange that only the "aligned chunk" part of the allocated space is included in a Valgrind vchunk. This suppresses complaints about that vchunk being possibly lost because PG is retaining only pointers to the aligned chunk. Also make sure that trailing wasted space is marked NOACCESS. As a tiny performance improvement, arrange that MCXT_ALLOC_ZERO zeroes only the returned "aligned chunk", not the wasted padding space. In passing, fix GetLocalBufferStorage to use MemoryContextAllocAligned instead of rolling its own implementation, which was equally broken according to Valgrind. Author: Tom Lane <tgl@sss.pgh.pa.us> Reviewed-by: Andres Freund <andres@anarazel.de> Discussion: https://postgr.es/m/285483.1746756246@sss.pgh.pa.us