Hi, When computing the dynamic value of shared_memory_size_in_huge_pages, (1+size_b/hp_size) is currently used. This works when size_b is not divisible by hp_size. However, it will yield an additional huge page when size_b is divisible by hp_size.
On CreateAnonymousSegment's side, the allocation size is rounded up to the next required huge pages when necessary. However, there's no overflow check when doing this round up. 0001: This patch replicates CreateAnonymousSegment's rounding method to InitializeShmemGUCs, only rounding up when the value is not divisible by hp_size. 0002: This patch uses add_size in CreateAnonymousSegment when the allocation size is rounded up, to check for possible overflow. Regards, Anthonin Bonnefoy
v1-0001-Fix-rounding-method-used-to-compute-shared_memory.patch
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v1-0002-Check-for-overflow-when-rounding-up-allocsize.patch
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