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Date: Wed, 12 May 2010 21:58:21 +0100
From: Mel Gorman <mel@....ul.ie>
To: Rik van Riel <riel@...hat.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Andrea Arcangeli <aarcange@...hat.com>,
Minchan Kim <minchan.kim@...il.com>,
Linux-MM <linux-mm@...ck.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
LKML <linux-kernel@...r.kernel.org>,
Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 2/5] change direct call of spin_lock(anon_vma->lock) to
inline function
On Wed, May 12, 2010 at 01:41:18PM -0400, Rik van Riel wrote:
> Subject: change direct call of spin_lock(anon_vma->lock) to inline function
>
> Subsitute a direct call of spin_lock(anon_vma->lock) with
> an inline function doing exactly the same.
>
> This makes it easier to do the substitution to the root
> anon_vma lock in a following patch.
>
> We will deal with the handful of special locks (nested,
> dec_and_lock, etc) separately.
>
> Signed-off-by: Rik van Riel <riel@...hat.com>
Acked-by: Mel Gorman <mel@....ul.ie>
> ---
> include/linux/rmap.h | 10 ++++++++++
> mm/ksm.c | 18 +++++++++---------
> mm/mmap.c | 2 +-
> mm/rmap.c | 20 ++++++++++----------
> 4 files changed, 30 insertions(+), 20 deletions(-)
>
> diff --git a/include/linux/rmap.h b/include/linux/rmap.h
> index 88cae59..72ecd87 100644
> --- a/include/linux/rmap.h
> +++ b/include/linux/rmap.h
> @@ -104,6 +104,16 @@ static inline void vma_unlock_anon_vma(struct vm_area_struct *vma)
> spin_unlock(&anon_vma->lock);
> }
>
> +static inline void anon_vma_lock(struct anon_vma *anon_vma)
> +{
> + spin_lock(&anon_vma->lock);
> +}
> +
> +static inline void anon_vma_unlock(struct anon_vma *anon_vma)
> +{
> + spin_unlock(&anon_vma->lock);
> +}
> +
> /*
> * anon_vma helper functions.
> */
> diff --git a/mm/ksm.c b/mm/ksm.c
> index 956880f..d488012 100644
> --- a/mm/ksm.c
> +++ b/mm/ksm.c
> @@ -327,7 +327,7 @@ static void drop_anon_vma(struct rmap_item *rmap_item)
>
> if (atomic_dec_and_lock(&anon_vma->ksm_refcount, &anon_vma->lock)) {
> int empty = list_empty(&anon_vma->head);
> - spin_unlock(&anon_vma->lock);
> + anon_vma_unlock(anon_vma);
> if (empty)
> anon_vma_free(anon_vma);
> }
> @@ -1566,7 +1566,7 @@ again:
> struct anon_vma_chain *vmac;
> struct vm_area_struct *vma;
>
> - spin_lock(&anon_vma->lock);
> + anon_vma_lock(anon_vma);
> list_for_each_entry(vmac, &anon_vma->head, same_anon_vma) {
> vma = vmac->vma;
> if (rmap_item->address < vma->vm_start ||
> @@ -1589,7 +1589,7 @@ again:
> if (!search_new_forks || !mapcount)
> break;
> }
> - spin_unlock(&anon_vma->lock);
> + anon_vma_unlock(anon_vma);
> if (!mapcount)
> goto out;
> }
> @@ -1619,7 +1619,7 @@ again:
> struct anon_vma_chain *vmac;
> struct vm_area_struct *vma;
>
> - spin_lock(&anon_vma->lock);
> + anon_vma_lock(anon_vma);
> list_for_each_entry(vmac, &anon_vma->head, same_anon_vma) {
> vma = vmac->vma;
> if (rmap_item->address < vma->vm_start ||
> @@ -1637,11 +1637,11 @@ again:
> ret = try_to_unmap_one(page, vma,
> rmap_item->address, flags);
> if (ret != SWAP_AGAIN || !page_mapped(page)) {
> - spin_unlock(&anon_vma->lock);
> + anon_vma_unlock(anon_vma);
> goto out;
> }
> }
> - spin_unlock(&anon_vma->lock);
> + anon_vma_unlock(anon_vma);
> }
> if (!search_new_forks++)
> goto again;
> @@ -1671,7 +1671,7 @@ again:
> struct anon_vma_chain *vmac;
> struct vm_area_struct *vma;
>
> - spin_lock(&anon_vma->lock);
> + anon_vma_lock(anon_vma);
> list_for_each_entry(vmac, &anon_vma->head, same_anon_vma) {
> vma = vmac->vma;
> if (rmap_item->address < vma->vm_start ||
> @@ -1688,11 +1688,11 @@ again:
>
> ret = rmap_one(page, vma, rmap_item->address, arg);
> if (ret != SWAP_AGAIN) {
> - spin_unlock(&anon_vma->lock);
> + anon_vma_unlock(anon_vma);
> goto out;
> }
> }
> - spin_unlock(&anon_vma->lock);
> + anon_vma_unlock(anon_vma);
> }
> if (!search_new_forks++)
> goto again;
> diff --git a/mm/mmap.c b/mm/mmap.c
> index d30bed3..f70bc65 100644
> --- a/mm/mmap.c
> +++ b/mm/mmap.c
> @@ -2589,7 +2589,7 @@ static void vm_unlock_anon_vma(struct anon_vma *anon_vma)
> if (!__test_and_clear_bit(0, (unsigned long *)
> &anon_vma->head.next))
> BUG();
> - spin_unlock(&anon_vma->lock);
> + anon_vma_unlock(anon_vma);
> }
> }
>
> diff --git a/mm/rmap.c b/mm/rmap.c
> index 07fc947..4eb8937 100644
> --- a/mm/rmap.c
> +++ b/mm/rmap.c
> @@ -134,7 +134,7 @@ int anon_vma_prepare(struct vm_area_struct *vma)
> allocated = anon_vma;
> }
>
> - spin_lock(&anon_vma->lock);
> + anon_vma_lock(anon_vma);
> /* page_table_lock to protect against threads */
> spin_lock(&mm->page_table_lock);
> if (likely(!vma->anon_vma)) {
> @@ -147,7 +147,7 @@ int anon_vma_prepare(struct vm_area_struct *vma)
> avc = NULL;
> }
> spin_unlock(&mm->page_table_lock);
> - spin_unlock(&anon_vma->lock);
> + anon_vma_unlock(anon_vma);
>
> if (unlikely(allocated))
> anon_vma_free(allocated);
> @@ -170,9 +170,9 @@ static void anon_vma_chain_link(struct vm_area_struct *vma,
> avc->anon_vma = anon_vma;
> list_add(&avc->same_vma, &vma->anon_vma_chain);
>
> - spin_lock(&anon_vma->lock);
> + anon_vma_lock(anon_vma);
> list_add_tail(&avc->same_anon_vma, &anon_vma->head);
> - spin_unlock(&anon_vma->lock);
> + anon_vma_unlock(anon_vma);
> }
>
> /*
> @@ -246,12 +246,12 @@ static void anon_vma_unlink(struct anon_vma_chain *anon_vma_chain)
> if (!anon_vma)
> return;
>
> - spin_lock(&anon_vma->lock);
> + anon_vma_lock(anon_vma);
> list_del(&anon_vma_chain->same_anon_vma);
>
> /* We must garbage collect the anon_vma if it's empty */
> empty = list_empty(&anon_vma->head) && !ksm_refcount(anon_vma);
> - spin_unlock(&anon_vma->lock);
> + anon_vma_unlock(anon_vma);
>
> if (empty)
> anon_vma_free(anon_vma);
> @@ -302,7 +302,7 @@ struct anon_vma *page_lock_anon_vma(struct page *page)
> goto out;
>
> anon_vma = (struct anon_vma *) (anon_mapping - PAGE_MAPPING_ANON);
> - spin_lock(&anon_vma->lock);
> + anon_vma_lock(anon_vma);
> return anon_vma;
> out:
> rcu_read_unlock();
> @@ -311,7 +311,7 @@ out:
>
> void page_unlock_anon_vma(struct anon_vma *anon_vma)
> {
> - spin_unlock(&anon_vma->lock);
> + anon_vma_unlock(anon_vma);
> rcu_read_unlock();
> }
>
> @@ -1364,7 +1364,7 @@ static int rmap_walk_anon(struct page *page, int (*rmap_one)(struct page *,
> anon_vma = page_anon_vma(page);
> if (!anon_vma)
> return ret;
> - spin_lock(&anon_vma->lock);
> + anon_vma_lock(anon_vma);
> list_for_each_entry(avc, &anon_vma->head, same_anon_vma) {
> struct vm_area_struct *vma = avc->vma;
> unsigned long address = vma_address(page, vma);
> @@ -1374,7 +1374,7 @@ static int rmap_walk_anon(struct page *page, int (*rmap_one)(struct page *,
> if (ret != SWAP_AGAIN)
> break;
> }
> - spin_unlock(&anon_vma->lock);
> + anon_vma_unlock(anon_vma);
> return ret;
> }
>
>
--
Mel Gorman
Part-time Phd Student Linux Technology Center
University of Limerick IBM Dublin Software Lab
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