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Date: Thu, 21 Aug 2014 09:31:58 -0300
From: Rafael Aquini <aquini@...hat.com>
To: Konstantin Khlebnikov <koct9i@...il.com>
Cc: Konstantin Khlebnikov <k.khlebnikov@...sung.com>,
"linux-mm@...ck.org" <linux-mm@...ck.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Sasha Levin <sasha.levin@...cle.com>,
Andrey Ryabinin <ryabinin.a.a@...il.com>
Subject: Re: [PATCH 7/7] mm/balloon_compaction: general cleanup
On Thu, Aug 21, 2014 at 11:30:59AM +0400, Konstantin Khlebnikov wrote:
> On Thu, Aug 21, 2014 at 3:58 AM, Rafael Aquini <aquini@...hat.com> wrote:
> > On Wed, Aug 20, 2014 at 07:05:09PM +0400, Konstantin Khlebnikov wrote:
> >> * move special branch for balloon migraion into migrate_pages
> >> * remove special mapping for balloon and its flag AS_BALLOON_MAP
> >> * embed struct balloon_dev_info into struct virtio_balloon
> >> * cleanup balloon_page_dequeue, kill balloon_page_free
> >>
> >> Signed-off-by: Konstantin Khlebnikov <k.khlebnikov@...sung.com>
> >> ---
> >> drivers/virtio/virtio_balloon.c | 77 ++++---------
> >> include/linux/balloon_compaction.h | 107 ++++++------------
> >> include/linux/migrate.h | 11 --
> >> include/linux/pagemap.h | 18 ---
> >> mm/balloon_compaction.c | 214 ++++++++++++------------------------
> >> mm/migrate.c | 27 +----
> >> 6 files changed, 130 insertions(+), 324 deletions(-)
> >>
> > Very nice clean-up, just as all other patches in this set.
> > Please, just consider amending the following changes to this patch of yours
>
> Well. Probably it's better to hide __Set/Clear inside mm/balloon_compaction.c
> it very unlikely that they might be used by somebody else.
> mm.h contains too many obscure static inlines and other barely used stuff.
>
Although I agree that very few codesites will actually resort to them,
I believe there's no argument to hide __Set/Clear if PageBalloon() itself is there.
Take a look into how many codesites __{Set,Clear}PageBuddy are being
called -- (as in their Balloon counterpart, just 1 codesite each).
For the sake of consistency and ease of maintainability, either leave all
BalloonPage() and friends at mm.h or move them all out,
hiding them in balloon_compaction.h.
> And it's worth to rename balloon_compaction.c/h into just balloon.c or
> memory_balloon because
> it provides generic balloon wtihout compaction too. Any objections?
>
No objections here, I was actually thinking about renaming them too.
--
Rafael
> >
> > Rafael
> > ---
> >
> > diff --git a/include/linux/balloon_compaction.h b/include/linux/balloon_compaction.h
> > index dc7073b..569cf96 100644
> > --- a/include/linux/balloon_compaction.h
> > +++ b/include/linux/balloon_compaction.h
> > @@ -75,41 +75,6 @@ extern struct page *balloon_page_dequeue(struct balloon_dev_info *b_dev_info);
> > #ifdef CONFIG_BALLOON_COMPACTION
> > extern bool balloon_page_isolate(struct page *page);
> > extern void balloon_page_putback(struct page *page);
> > -
> > -/*
> > - * balloon_page_insert - insert a page into the balloon's page list and make
> > - * the page->mapping assignment accordingly.
> > - * @page : page to be assigned as a 'balloon page'
> > - * @mapping : allocated special 'balloon_mapping'
> > - * @head : balloon's device page list head
> > - *
> > - * Caller must ensure the page is locked and the spin_lock protecting balloon
> > - * pages list is held before inserting a page into the balloon device.
> > - */
> > -static inline void
> > -balloon_page_insert(struct balloon_dev_info *balloon, struct page *page)
> > -{
> > - __SetPageBalloon(page);
> > - set_page_private(page, (unsigned long)balloon);
> > - list_add(&page->lru, &balloon->pages);
> > -}
> > -
> > -/*
> > - * balloon_page_delete - delete a page from balloon's page list and clear
> > - * the page->mapping assignement accordingly.
> > - * @page : page to be released from balloon's page list
> > - *
> > - * Caller must ensure the page is locked and the spin_lock protecting balloon
> > - * pages list is held before deleting a page from the balloon device.
> > - */
> > -static inline void balloon_page_delete(struct page *page, bool isolated)
> > -{
> > - __ClearPageBalloon(page);
> > - set_page_private(page, 0);
> > - if (!isolated)
> > - list_del(&page->lru);
> > -}
> > -
> > int balloon_page_migrate(new_page_t get_new_page, free_page_t put_new_page,
> > unsigned long private, struct page *page,
> > int force, enum migrate_mode mode);
> > @@ -130,31 +95,6 @@ static inline gfp_t balloon_mapping_gfp_mask(void)
> >
> > #else /* !CONFIG_BALLOON_COMPACTION */
> >
> > -static inline void *balloon_mapping_alloc(void *balloon_device,
> > - const struct address_space_operations *a_ops)
> > -{
> > - return ERR_PTR(-EOPNOTSUPP);
> > -}
> > -
> > -static inline void balloon_mapping_free(struct address_space *balloon_mapping)
> > -{
> > - return;
> > -}
> > -
> > -static inline void
> > -balloon_page_insert(struct balloon_dev_info *balloon, struct page *page)
> > -{
> > - __SetPageBalloon(page);
> > - list_add(&page->lru, head);
> > -}
> > -
> > -static inline void balloon_page_delete(struct page *page, bool isolated)
> > -{
> > - __ClearPageBalloon(page);
> > - if (!isolated)
> > - list_del(&page->lru);
> > -}
> > -
> > static inline int balloon_page_migrate(new_page_t get_new_page,
> > free_page_t put_new_page, unsigned long private,
> > struct page *page, int force, enum migrate_mode mode)
> > @@ -176,6 +116,46 @@ static inline gfp_t balloon_mapping_gfp_mask(void)
> > {
> > return GFP_HIGHUSER;
> > }
> > -
> > #endif /* CONFIG_BALLOON_COMPACTION */
> > +
> > +/*
> > + * balloon_page_insert - insert a page into the balloon's page list and make
> > + * the page->mapping assignment accordingly.
> > + * @page : page to be assigned as a 'balloon page'
> > + * @mapping : allocated special 'balloon_mapping'
> > + * @head : balloon's device page list head
> > + *
> > + * Caller must ensure the page is locked and the spin_lock protecting balloon
> > + * pages list is held before inserting a page into the balloon device.
> > + */
> > +static inline void
> > +balloon_page_insert(struct balloon_dev_info *balloon, struct page *page)
> > +{
> > +#ifdef CONFIG_MEMORY_BALLOON
> > + __SetPageBalloon(page);
> > + set_page_private(page, (unsigned long)balloon);
> > + list_add(&page->lru, &balloon->pages);
> > + inc_zone_page_state(page, NR_BALLOON_PAGES);
> > +#endif
> > +}
> > +
> > +/*
> > + * balloon_page_delete - delete a page from balloon's page list and clear
> > + * the page->mapping assignement accordingly.
> > + * @page : page to be released from balloon's page list
> > + *
> > + * Caller must ensure the page is locked and the spin_lock protecting balloon
> > + * pages list is held before deleting a page from the balloon device.
> > + */
> > +static inline void balloon_page_delete(struct page *page, bool isolated)
> > +{
> > +#ifdef CONFIG_MEMORY_BALLOON
> > + __ClearPageBalloon(page);
> > + set_page_private(page, 0);
> > + if (!isolated)
> > + list_del(&page->lru);
> > + dec_zone_page_state(page, NR_BALLOON_PAGES);
> > +#endif
> > +}
> > +
> > #endif /* _LINUX_BALLOON_COMPACTION_H */
> > --
> > 1.9.3
> >
> > --
> > To unsubscribe, send a message with 'unsubscribe linux-mm' in
> > the body to majordomo@...ck.org. For more info on Linux MM,
> > see: http://www.linux-mm.org/ .
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