Hi,

Our application uses LMDB and sometimes we need to perform scan of old ("cold") data.
The problem here is that this data can/will remove "hot" data from page-cache.

Ideally to prevent this from happening we'd like to somehow mark cursor as "streaming"/"non-temporal".
But AFAICS there is no such feature currently.

We're experimenting with marking pages returned by cursor with madvise(MADV_DONTNEED) and this at least prevents RSS from growing.
But maybe there are some downsides of this approach?

Thanks!

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