Re: [PATCH 15/15] io_uring: add io_uring_event cache hit information

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Jens Axboe <axboe@xxxxxxxxx> writes:

> Add hint on whether a read was served out of the page cache, or if it
> hit media. This is useful for buffered async IO, O_DIRECT reads would
> never have this set (for obvious reasons).
>
> If the read hit page cache, cqe->flags will have IOCQE_FLAG_CACHEHIT
> set.

We may want to hold off on this one until the whole mincore/RWF_NOWAIT
debate is sorted. [1]

Cheers,
Jeff

[1] https://lore.kernel.org/lkml/20190109022430.GE27534@dastard/



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