Wu Fengguang <[email protected]> wrote:
>
> An new page flag PG_readahead is introduced as a look-ahead mark, which
> reminds the caller to give the adaptive read-ahead logic a chance to do
> read-ahead ahead of time for I/O pipelining.
>
> It roughly corresponds to `ahead_start' of the stock read-ahead logic.
>
This isn't a very revealing description of what this flag does.
> +#define __SetPageReadahead(page) __set_bit(PG_readahead, &(page)->flags)
uh-oh. This is extremly risky. Needs extensive justification, please.
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