Dave Hansen wrote:
> > +repeat:
> > + page = find_lock_page(mapping, index);
> > + if (page) {
> > + if (!PageTransHuge(page)) {
> > + unlock_page(page);
> > + page_cache_release(page);
> > + return NULL;
> > + }
> > + goto found;
> > + }
> > +
> > + page = alloc_pages(gfp_mask & ~gfp_notmask, HPAGE_PMD_ORDER);
>
> I alluded to this a second ago, but what's wrong with alloc_hugepage()?
It's defined only for !CONFIG_NUMA and only inside mm/huge_memory.c.
> > +found:
> > + wait_on_page_writeback(page);
> > + return page;
> > +}
> > +#endif
>
> So, I diffed :
>
> -struct page *grab_cache_page_write_begin(struct address_space
> vs.
> +struct page *grab_cache_huge_page_write_begin(struct address_space
>
> They're just to similar to ignore. Please consolidate them somehow.
Will do.
> > +found:
> > + wait_on_page_writeback(page);
> > + return page;
> > +}
> > +#endif
>
> In grab_cache_page_write_begin(), this "wait" is:
>
> wait_for_stable_page(page);
>
> Why is it different here?
It was wait_on_page_writeback() in grab_cache_page_write_begin() when I forked
it :(
See 1d1d1a7 mm: only enforce stable page writes if the backing device requires it
Consolidation will fix this.
--
Kirill A. Shutemov
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