On Tue, Mar 26, 2013 at 05:31:51PM +0530, Aneesh Kumar K.V wrote:
> Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx> writes:
>
> > +/* Returns true for head pages of in-use hugepages, otherwise returns false. */
> > +bool is_hugepage_movable(struct page *hpage)
> > +{
> > + struct page *page;
> > + struct hstate *h;
> > + bool ret = false;
> > +
> > + VM_BUG_ON(!PageHuge(hpage));
> > + /*
> > + * This function can be called for a tail page because memory hotplug
> > + * scans movability of pages by pfn range of a memory block.
> > + * Larger hugepages (1GB for x86_64) are larger than memory block, so
> > + * the scan can start at the tail page of larger hugepages.
> > + * 1GB hugepage is not movable now, so we return with false for now.
> > + */
> > + if (PageTail(hpage))
> > + return false;
> > + h = page_hstate(hpage);
> > + spin_lock(&hugetlb_lock);
> > + list_for_each_entry(page, &h->hugepage_activelist, lru)
> > + if (page == hpage) {
> > + ret = true;
> > + break;
> > + }
> > + spin_unlock(&hugetlb_lock);
> > + return ret;
> > +}
> > +
>
> May be is_hugepage_active() ?
Yes, it would be nice.
Thanks,
Naoya
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