Re: [RFC PATCH 0/3] Aggressively allocate the pages on cma reserved memory

[Mel Gorman]

On Thu, May 15, 2014 at 11:10:55AM +0900, Joonsoo Kim wrote:
> > That doesn't always prefer CMA region. It would be nice to
> > understand why grouping in pageblock_nr_pages is beneficial. Also in
> > your patch you decrement nr_try_cma for every 'order' allocation. Why ?
> 
> pageblock_nr_pages is just magic value with no rationale. :)

I'm not following this discussions closely but there is rational to that
value -- it's the size of a huge page for that architecture.  At the time
the fragmentation avoidance was implemented this was the largest allocation
size of interest.

-- 
Mel Gorman
SUSE Labs
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/