[PATCH/RFCv4 0/6] The Contiguous Memory Allocator framework

Michał Nazarewicz
2010-08-26T01:28:41Z

On Fri, 20 Aug 2010 15:15:10 +0200, Peter Zijlstra <peterz@infradead.org> wrote:
> So the idea is to grab a large chunk of memory at boot time and then
> later allow some device to use it?
>
> I'd much rather we'd improve the regular page allocator to be smarter
> about this. We recently added a lot of smarts to it like memory
> compaction, which allows large gobs of contiguous memory to be freed for
> things like huge pages.
>
> If you want guarantees you can free stuff, why not add constraints to
> the page allocation type and only allow MIGRATE_MOVABLE pages inside a
> certain region, those pages are easily freed/moved aside to satisfy
> large contiguous allocations.

I'm aware that grabbing a large chunk at boot time is a bit of waste of
space and because of it I'm hoping to came up with a way of reusing the
space when it's not used by CMA-aware devices. My current idea was to
use it for easily discardable data (page cache?).

> Also, please remove --chain-reply-to from your git config. You're using
> 1.7 which should do the right thing (--no-chain-reply-to) by default.

OK.

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