On Wed, Jul 25, 2012 at 11:57:13AM -0700, Andrew Morton wrote:
> On Wed, 25 Jul 2012 09:35:03 +0200
> Johannes Weiner <han...@cmpxchg.org> wrote:
>
> > As this is unlikely to reappear in this merge window, the conflict
> > resolution is quite simple. All that's needed is remove the 3 hunks
> > from my patch that converted a user in Peter's patch to a new API. I
> > can resend the series if needed, but it's probably easier to just
> > remove the hunks against mm/migrate.c::migrate_misplaced_page():
> >
> > @@ -1519,10 +1512,9 @@ migrate_misplaced_page(struct page *page, struct
> > mm_struct *mm, int node)
> > {
> > struct page *oldpage = page, *newpage;
> > struct address_space *mapping = page_mapping(page);
> > - struct mem_cgroup *mcg;
> > + struct mem_cgroup *memcg;
> > unsigned int gfp;
> > int rc = 0;
> > - int charge = -ENOMEM;
> >
> > VM_BUG_ON(!PageLocked(page));
> > VM_BUG_ON(page_mapcount(page));
> > @@ -1556,12 +1548,7 @@ migrate_misplaced_page(struct page *page, struct
> > mm_struct *mm, int node)
> > if (!trylock_page(newpage))
> > BUG(); /* new page should be unlocked!!! */
> >
> > - // XXX hnaz, is this right?
> > - charge = mem_cgroup_prepare_migration(page, newpage, &mcg, gfp);
> > - if (charge == -ENOMEM) {
> > - rc = charge;
> > - goto out;
> > - }
> > + mem_cgroup_prepare_migration(page, newpage, &memcg);
> >
> > newpage->index = page->index;
> > newpage->mapping = page->mapping;
> > @@ -1581,11 +1568,9 @@ migrate_misplaced_page(struct page *page, struct
> > mm_struct *mm, int node)
> > page = newpage;
> > }
> >
> > + mem_cgroup_end_migration(memcg, oldpage, newpage, !rc);
> > out:
> > - if (!charge)
> > - mem_cgroup_end_migration(mcg, oldpage, newpage, !rc);
> > -
> > - if (oldpage != page)
> > + if (oldpage != page)
> > put_page(oldpage);
> >
> > if (rc) {
>
> Yes, that worked out OK.
>
> This means that if the above code reappears in linux-next or mainline,
> the current copy of
> mm-memcg-fix-compaction-migration-failing-due-to-memcg-limits.patch
> will no longer update it, and I probably won't notice that omission.
The gfp_t argument was dropped from mem_cgroup_prepare_migration(), so
it'll blow up during compilation with CONFIG_NUMA=y.
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