On 07/03/2013 01:34 AM, Joonsoo Kim wrote:
> - if (page)
> + do {
> + page = buffered_rmqueue(preferred_zone, zone, order,
> + gfp_mask, migratetype);
> + if (!page)
> + break;
> +
> + if (!nr_pages) {
> + count++;
> + break;
> + }
> +
> + pages[count++] = page;
> + if (count >= *nr_pages)
> + break;
> +
> + mark = zone->watermark[alloc_flags & ALLOC_WMARK_MASK];
> + if (!zone_watermark_ok(zone, order, mark,
> + classzone_idx, alloc_flags))
> + break;
> + } while (1);
I'm really surprised this works as well as it does. Calling
buffered_rmqueue() a bunch of times enables/disables interrupts a bunch
of times, and mucks with the percpu pages lists a whole bunch.
buffered_rmqueue() is really meant for _single_ pages, not to be called
a bunch of times in a row.
Why not just do a single rmqueue_bulk() call?
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