On Mon, Nov 25, 2013 at 10:09:21PM -0800, Christoph Hellwig wrote:
> > + q->bio_split = bioset_create(4, 0);
> > + if (!q->bio_split)
> > + goto fail_id;
>
> How did we arrive at a mempool size of 4 to make sure we can always make
> progress with arbitrarily sized bios? Shouldn't we
> + q->bio_split = bioset_create(4, 0);
> + if (!q->bio_split)
> + goto fail_id;
How did we arrive at a mempool size of 4 to make sure we can always make
progress with arbitrarily sized bios? Shouldn't we document the design
decision somewhere?
> +static struct bio *blk_bio_d
The way the block layer is currently written, it goes to great lengths
to avoid having to split bios; upper layer code (such as bio_add_page())
checks what the underlying device can handle and tries to always create
bios that don't need to be split.
But this approach becomes unwieldy and eventuall
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