Re: Using vmalloc instead of get_free_pages?

["Stephen R. van den Berg" <srb@cuci.nl>]

Slava Pestov wrote:
>On Sat, Dec 27, 2014 at 2:52 AM, Stephen R. van den Berg <srb@cuci.nl> wrote:
>> - That the amount of memory being allocated for a single caching device
>> exceeds maximum the amount allocatable by get_free_pages(), so I changed

>As you've already noticed this is fixed in bcache-dev, but that brings in a

I already hoped it would have been, but since the ondisk format changed,
I couldn't fully confirm this yet.  I don't mind changing the on-disk format,
BTW, because I am still able to reformat the disks before the servers
go into production.

>Support for multiple cache devices is in bcache-dev, it requires changes
>to both make-bcache and the kernel. I'm not sure what the time frame for
>upstreaming this is, since the changes are more involved.

Well, I don't mind running a custom kernel and custom bcache userspace
tools for a while.  I have been rolling my own kernels since 1992.

I presume that eventually all changes will be upstreamed (including the
changes in the on-disk format)?  So, until then, I'll simply rebase bcache-dev
on top of the most recent kernels manually.

I *would* be interested in the new bcache userspace tools though then.
-- 
Stephen.