Hi Mel-san.
This is very interesting feature.
Now, I'm testing your patches.
> +static int isolate_migratepages(struct zone *zone,
> + struct compact_control *cc)
> +{
> + unsigned long high_pfn, low_pfn, end_pfn, start_pfn;
(snip)
> + /* Time to isolate some pages for migration */
> + spin_lock_irq(&zone->lru_lock);
> + for (; low_pfn < end_pfn; low_pfn++) {
> + if (!pfn_valid_within(low_pfn))
> + continue;
> +
> + /* Get the page and skip if free */
> + page = pfn_to_page(low_pfn);
I met panic at here on my tiger4.
I compiled with CONFIG_SPARSEMEM. So, CONFIG_HOLES_IN_ZONE is not set.
pfn_valid_within() returns 1 every time on this configuration.
(This config is for only virtual memmap)
But, my tiger4 box has memory holes in normal zone.
When it is changed to normal pfn_valid(), no panic occurs.
Hmmm.
Bye.
--
Yasunori Goto
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