Re: [PATCH 1/3] rhashtable: require max_shift definition

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Am 10. Februar 2015 18:22:41 MEZ, schrieb Thomas Graf <tgraf@xxxxxxx>:
>On 02/10/15 at 06:06pm, Daniel Borkmann wrote:
>> Hm, given that min_shift/max_shift are parameters that directly
>> concern internals of rhashtable i.e. are tightly coupled to expand
>> and shrink functionality, I'd say that depending on the use case,
>> a maxelem limit should rather be handled outside of it, if it's
>> truly an issue/concern.
>
>Agreed, Netlink already uses the atomic counter of rhashtable to
>enforce  upper limit of table entries:
>
>        err = -ENOMEM;
>        if (BITS_PER_LONG > 32 &&
>            unlikely(atomic_read(&table->hash.nelems) >= UINT_MAX))
>                goto err;

I would tend to agree with Pablo, now we're handling half (shift) internally and half (max) externally, using internal values.

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