Re: [Linaro-mm-sig] [PATCHv17 0/11] Contiguous Memory Allocator

On Fri, 18 Nov 2011 22:20:48 +0100, sandeep patil psandeep.s@gmail.com wrote:

I am running a simple test to allocate contiguous regions and write a log on in a file on sdcard simultaneously. I can reproduce this migration failure 100% times with it. when I tracked the pages that failed to migrate, I found them on the buffer head lru list with a reference held on the buffer_head in the page, which causes drop_buffers() to fail.

So, i guess my question is, until all the migration failures are tracked down and fixed, is there a plan to retry the contiguous allocation from a new range in the CMA region?

No. Current CMA implementation will stick to the same range of pages also on consequent allocations of the same size.