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Date: Mon, 28 Jan 2013 20:39:35 -0800 (PST)
From: Hugh Dickins <hughd@...gle.com>
To: Mel Gorman <mgorman@...e.de>
cc: Andrew Morton <akpm@...ux-foundation.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Andrea Arcangeli <aarcange@...hat.com>,
Ingo Molnar <mingo@...nel.org>,
Simon Jeons <simon.jeons@...il.com>,
Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
Linux-MM <linux-mm@...ck.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: Rename page struct field helpers
On Thu, 24 Jan 2013, Mel Gorman wrote:
> The function names page_xchg_last_nid(), page_last_nid() and
> reset_page_last_nid() were judged to be inconsistent so rename them
> to a struct_field_op style pattern. As it looked jarring to have
> reset_page_mapcount() and page_nid_reset_last() beside each other in
> memmap_init_zone(), this patch also renames reset_page_mapcount() to
> page_mapcount_reset(). There are others like init_page_count() but as it
> is used throughout the arch code a rename would likely cause more conflicts
> than it is worth.
>
> Suggested-by: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: Mel Gorman <mgorman@...e.de>
Sorry for not piping up in that earlier thread, but I don't understand
Andrew's reasoning on this: it looks to me like unhelpful churn rather
than improvement (and I suspect your heart is not in it either, Mel).
It's true that sometimes we name things object_verb() and sometimes we
name things verb_object(), but we're always going to be inconsistent on
that, and this patch does not change the fact: page_mapcount_reset()
but set_page_private() (named by one akpm, I believe)?
Being English, I really prefer verb_object(); but there are often
subsystems or cfiles where object_verb() narrows the namespace more
nicely.
xchg_page_last_nid() instead of page_xchg_last_nid(), to match
reset_page_last_nid(): I think that would be a fine change.
page_nid_xchg_last() to exchange page->_last_nid? You jest, sir!
Hugh
> ---
> drivers/staging/ramster/zbud.c | 2 +-
> drivers/staging/zsmalloc/zsmalloc-main.c | 2 +-
> include/linux/mm.h | 20 ++++++++++----------
> mm/huge_memory.c | 2 +-
> mm/mempolicy.c | 2 +-
> mm/migrate.c | 4 ++--
> mm/mmzone.c | 4 ++--
> mm/page_alloc.c | 10 +++++-----
> mm/slob.c | 2 +-
> mm/slub.c | 2 +-
> 10 files changed, 25 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/staging/ramster/zbud.c b/drivers/staging/ramster/zbud.c
> index a7c4361..cc2deff 100644
> --- a/drivers/staging/ramster/zbud.c
> +++ b/drivers/staging/ramster/zbud.c
> @@ -401,7 +401,7 @@ static inline struct page *zbud_unuse_zbudpage(struct zbudpage *zbudpage,
> else
> zbud_pers_pageframes--;
> zbudpage_spin_unlock(zbudpage);
> - reset_page_mapcount(page);
> + page_mapcount_reset(page);
> init_page_count(page);
> page->index = 0;
> return page;
> diff --git a/drivers/staging/zsmalloc/zsmalloc-main.c b/drivers/staging/zsmalloc/zsmalloc-main.c
> index 09a9d35..c7785f2 100644
> --- a/drivers/staging/zsmalloc/zsmalloc-main.c
> +++ b/drivers/staging/zsmalloc/zsmalloc-main.c
> @@ -475,7 +475,7 @@ static void reset_page(struct page *page)
> set_page_private(page, 0);
> page->mapping = NULL;
> page->freelist = NULL;
> - reset_page_mapcount(page);
> + page_mapcount_reset(page);
> }
>
> static void free_zspage(struct page *first_page)
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 6e4468f..0aa0944 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -366,7 +366,7 @@ static inline struct page *compound_head(struct page *page)
> * both from it and to it can be tracked, using atomic_inc_and_test
> * and atomic_add_negative(-1).
> */
> -static inline void reset_page_mapcount(struct page *page)
> +static inline void page_mapcount_reset(struct page *page)
> {
> atomic_set(&(page)->_mapcount, -1);
> }
> @@ -657,28 +657,28 @@ static inline int page_to_nid(const struct page *page)
>
> #ifdef CONFIG_NUMA_BALANCING
> #ifdef LAST_NID_NOT_IN_PAGE_FLAGS
> -static inline int page_xchg_last_nid(struct page *page, int nid)
> +static inline int page_nid_xchg_last(struct page *page, int nid)
> {
> return xchg(&page->_last_nid, nid);
> }
>
> -static inline int page_last_nid(struct page *page)
> +static inline int page_nid_last(struct page *page)
> {
> return page->_last_nid;
> }
> -static inline void reset_page_last_nid(struct page *page)
> +static inline void page_nid_reset_last(struct page *page)
> {
> page->_last_nid = -1;
> }
> #else
> -static inline int page_last_nid(struct page *page)
> +static inline int page_nid_last(struct page *page)
> {
> return (page->flags >> LAST_NID_PGSHIFT) & LAST_NID_MASK;
> }
>
> -extern int page_xchg_last_nid(struct page *page, int nid);
> +extern int page_nid_xchg_last(struct page *page, int nid);
>
> -static inline void reset_page_last_nid(struct page *page)
> +static inline void page_nid_reset_last(struct page *page)
> {
> int nid = (1 << LAST_NID_SHIFT) - 1;
>
> @@ -687,17 +687,17 @@ static inline void reset_page_last_nid(struct page *page)
> }
> #endif /* LAST_NID_NOT_IN_PAGE_FLAGS */
> #else
> -static inline int page_xchg_last_nid(struct page *page, int nid)
> +static inline int page_nid_xchg_last(struct page *page, int nid)
> {
> return page_to_nid(page);
> }
>
> -static inline int page_last_nid(struct page *page)
> +static inline int page_nid_last(struct page *page)
> {
> return page_to_nid(page);
> }
>
> -static inline void reset_page_last_nid(struct page *page)
> +static inline void page_nid_reset_last(struct page *page)
> {
> }
> #endif
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index 648c102..c52311a 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -1642,7 +1642,7 @@ static void __split_huge_page_refcount(struct page *page)
> page_tail->mapping = page->mapping;
>
> page_tail->index = page->index + i;
> - page_xchg_last_nid(page_tail, page_last_nid(page));
> + page_nid_xchg_last(page_tail, page_nid_last(page));
>
> BUG_ON(!PageAnon(page_tail));
> BUG_ON(!PageUptodate(page_tail));
> diff --git a/mm/mempolicy.c b/mm/mempolicy.c
> index e2df1c1..db6fc14 100644
> --- a/mm/mempolicy.c
> +++ b/mm/mempolicy.c
> @@ -2308,7 +2308,7 @@ int mpol_misplaced(struct page *page, struct vm_area_struct *vma, unsigned long
> * it less likely we act on an unlikely task<->page
> * relation.
> */
> - last_nid = page_xchg_last_nid(page, polnid);
> + last_nid = page_nid_xchg_last(page, polnid);
> if (last_nid != polnid)
> goto out;
> }
> diff --git a/mm/migrate.c b/mm/migrate.c
> index 8ef1cbf..88422a1 100644
> --- a/mm/migrate.c
> +++ b/mm/migrate.c
> @@ -1495,7 +1495,7 @@ static struct page *alloc_misplaced_dst_page(struct page *page,
> __GFP_NOWARN) &
> ~GFP_IOFS, 0);
> if (newpage)
> - page_xchg_last_nid(newpage, page_last_nid(page));
> + page_nid_xchg_last(newpage, page_nid_last(page));
>
> return newpage;
> }
> @@ -1679,7 +1679,7 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm,
> if (!new_page)
> goto out_fail;
>
> - page_xchg_last_nid(new_page, page_last_nid(page));
> + page_nid_xchg_last(new_page, page_nid_last(page));
>
> isolated = numamigrate_isolate_page(pgdat, page);
> if (!isolated) {
> diff --git a/mm/mmzone.c b/mm/mmzone.c
> index bce796e..2ac0afb 100644
> --- a/mm/mmzone.c
> +++ b/mm/mmzone.c
> @@ -98,14 +98,14 @@ void lruvec_init(struct lruvec *lruvec)
> }
>
> #if defined(CONFIG_NUMA_BALANCING) && !defined(LAST_NID_NOT_IN_PAGE_FLAGS)
> -int page_xchg_last_nid(struct page *page, int nid)
> +int page_nid_xchg_last(struct page *page, int nid)
> {
> unsigned long old_flags, flags;
> int last_nid;
>
> do {
> old_flags = flags = page->flags;
> - last_nid = page_last_nid(page);
> + last_nid = page_nid_last(page);
>
> flags &= ~(LAST_NID_MASK << LAST_NID_PGSHIFT);
> flags |= (nid & LAST_NID_MASK) << LAST_NID_PGSHIFT;
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index df2022f..2d525c8 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -287,7 +287,7 @@ static void bad_page(struct page *page)
>
> /* Don't complain about poisoned pages */
> if (PageHWPoison(page)) {
> - reset_page_mapcount(page); /* remove PageBuddy */
> + page_mapcount_reset(page); /* remove PageBuddy */
> return;
> }
>
> @@ -319,7 +319,7 @@ static void bad_page(struct page *page)
> dump_stack();
> out:
> /* Leave bad fields for debug, except PageBuddy could make trouble */
> - reset_page_mapcount(page); /* remove PageBuddy */
> + page_mapcount_reset(page); /* remove PageBuddy */
> add_taint(TAINT_BAD_PAGE);
> }
>
> @@ -605,7 +605,7 @@ static inline int free_pages_check(struct page *page)
> bad_page(page);
> return 1;
> }
> - reset_page_last_nid(page);
> + page_nid_reset_last(page);
> if (page->flags & PAGE_FLAGS_CHECK_AT_PREP)
> page->flags &= ~PAGE_FLAGS_CHECK_AT_PREP;
> return 0;
> @@ -3871,8 +3871,8 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone,
> set_page_links(page, zone, nid, pfn);
> mminit_verify_page_links(page, zone, nid, pfn);
> init_page_count(page);
> - reset_page_mapcount(page);
> - reset_page_last_nid(page);
> + page_mapcount_reset(page);
> + page_nid_reset_last(page);
> SetPageReserved(page);
> /*
> * Mark the block movable so that blocks are reserved for
> diff --git a/mm/slob.c b/mm/slob.c
> index a99fdf7..eeed4a0 100644
> --- a/mm/slob.c
> +++ b/mm/slob.c
> @@ -360,7 +360,7 @@ static void slob_free(void *block, int size)
> clear_slob_page_free(sp);
> spin_unlock_irqrestore(&slob_lock, flags);
> __ClearPageSlab(sp);
> - reset_page_mapcount(sp);
> + page_mapcount_reset(sp);
> slob_free_pages(b, 0);
> return;
> }
> diff --git a/mm/slub.c b/mm/slub.c
> index ba2ca53..ebcc44e 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -1408,7 +1408,7 @@ static void __free_slab(struct kmem_cache *s, struct page *page)
> __ClearPageSlab(page);
>
> memcg_release_pages(s, order);
> - reset_page_mapcount(page);
> + page_mapcount_reset(page);
> if (current->reclaim_state)
> current->reclaim_state->reclaimed_slab += pages;
> __free_memcg_kmem_pages(page, order);
>
--
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