add arena.i.metadata_use_hooks #1
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Specifically, this change allows the default alloc hook to used during arenas.create. One use case is to invoke the default alloc hook in a customized hook arena, i.e. the default hooks can be read out of a default arena, then create customized ones based on these hooks. Note that mixing the default with customized hooks is not recommended, and should only be considered when the customization is simple and straightforward.
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This mallctl accepts an arena_config_t structure which can be used to customize the behavior of the arena. Right now it contains extent_hooks and a new option, metadata_use_hooks, which controls whether the extent hooks are also used for metadata allocation. The medata_use_hooks option has two main use cases: 1. In heterogeneous memory systems, to avoid metadata being placed on potentially slower memory. 2. Avoiding virtual memory from being leaked as a result of metadata allocation failure originating in an extent hook.
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This new option controls whether the extent hooks are also
used for metadata allocation.
This has two main use cases:
In heterogeneous memory systems, to avoid metadata
being placed on potentially slower memory.
Avoididing virtual memory from being leaked as a result
of metadata allocation failure originating in an extent hook.