Re: [PATCH 1/3] block: loop: use kmap(page) instead of page_address(page)

[Christoph Hellwig]

On Tue, Mar 24, 2015 at 06:49:00PM +0800, Ming Lei wrote:
> On 32bit system, this still may cause pressure on page allocation, since
> requests are handled concurrently now after using workqueue.

kmap slots are from a much smaller resource pool than non-highmem
allocations, so if a page needs to stay kmaped from allocation time until
freeing it it should just be allocated as a kernel mapped page.
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