From: Vitaly Wool <vitalywool@gmail.com>
To: Linux-MM <linux-mm@kvack.org>,
linux-kernel <linux-kernel@vger.kernel.org>
Cc: Dan Streetman <ddstreet@ieee.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: [PATCH/RESEND v3 1/5] z3fold: make pages_nr atomic
Date: Tue, 31 Jan 2017 21:39:46 +0100 [thread overview]
Message-ID: <20170131213946.b828676ab17bbea42022c213@gmail.com> (raw)
In-Reply-To: <20170131213829.3d86c07ffd1358019354c937@gmail.com>
This patch converts pages_nr per-pool counter to atomic64_t.
Signed-off-by: Vitaly Wool <vitalywool@gmail.com>
---
mm/z3fold.c | 20 +++++++++-----------
1 file changed, 9 insertions(+), 11 deletions(-)
diff --git a/mm/z3fold.c b/mm/z3fold.c
index 207e5dd..2273789 100644
--- a/mm/z3fold.c
+++ b/mm/z3fold.c
@@ -80,7 +80,7 @@ struct z3fold_pool {
struct list_head unbuddied[NCHUNKS];
struct list_head buddied;
struct list_head lru;
- u64 pages_nr;
+ atomic64_t pages_nr;
const struct z3fold_ops *ops;
struct zpool *zpool;
const struct zpool_ops *zpool_ops;
@@ -238,7 +238,7 @@ static struct z3fold_pool *z3fold_create_pool(gfp_t gfp,
INIT_LIST_HEAD(&pool->unbuddied[i]);
INIT_LIST_HEAD(&pool->buddied);
INIT_LIST_HEAD(&pool->lru);
- pool->pages_nr = 0;
+ atomic64_set(&pool->pages_nr, 0);
pool->ops = ops;
return pool;
}
@@ -350,7 +350,7 @@ static int z3fold_alloc(struct z3fold_pool *pool, size_t size, gfp_t gfp,
if (!page)
return -ENOMEM;
spin_lock(&pool->lock);
- pool->pages_nr++;
+ atomic64_inc(&pool->pages_nr);
zhdr = init_z3fold_page(page);
if (bud == HEADLESS) {
@@ -443,10 +443,9 @@ static void z3fold_free(struct z3fold_pool *pool, unsigned long handle)
return;
}
- if (bud != HEADLESS) {
- /* Remove from existing buddy list */
+ /* Remove from existing buddy list */
+ if (bud != HEADLESS)
list_del(&zhdr->buddy);
- }
if (bud == HEADLESS ||
(zhdr->first_chunks == 0 && zhdr->middle_chunks == 0 &&
@@ -455,7 +454,7 @@ static void z3fold_free(struct z3fold_pool *pool, unsigned long handle)
list_del(&page->lru);
clear_bit(PAGE_HEADLESS, &page->private);
free_z3fold_page(zhdr);
- pool->pages_nr--;
+ atomic64_dec(&pool->pages_nr);
} else {
z3fold_compact_page(zhdr);
/* Add to the unbuddied list */
@@ -573,7 +572,7 @@ static int z3fold_reclaim_page(struct z3fold_pool *pool, unsigned int retries)
*/
clear_bit(PAGE_HEADLESS, &page->private);
free_z3fold_page(zhdr);
- pool->pages_nr--;
+ atomic64_dec(&pool->pages_nr);
spin_unlock(&pool->lock);
return 0;
} else if (!test_bit(PAGE_HEADLESS, &page->private)) {
@@ -676,12 +675,11 @@ static void z3fold_unmap(struct z3fold_pool *pool, unsigned long handle)
* z3fold_get_pool_size() - gets the z3fold pool size in pages
* @pool: pool whose size is being queried
*
- * Returns: size in pages of the given pool. The pool lock need not be
- * taken to access pages_nr.
+ * Returns: size in pages of the given pool.
*/
static u64 z3fold_get_pool_size(struct z3fold_pool *pool)
{
- return pool->pages_nr;
+ return atomic64_read(&pool->pages_nr);
}
/*****************
--
2.4.2
next prev parent reply other threads:[~2017-01-31 20:39 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-31 20:38 [PATCH/RESEND v3 0/5] z3fold: optimizations and fixes Vitaly Wool
2017-01-31 20:39 ` Vitaly Wool [this message]
2017-02-01 15:04 ` [PATCH/RESEND v3 1/5] z3fold: make pages_nr atomic Dan Streetman
2017-01-31 20:40 ` [PATCH/RESEND v3 2/5] z3fold: fix header size related issues Vitaly Wool
2017-02-01 15:05 ` Dan Streetman
2017-01-31 20:43 ` [PATCH/RESEND v3 3/5] z3fold: extend compaction function Vitaly Wool
2017-02-01 15:05 ` Dan Streetman
2017-01-31 20:44 ` [PATCH/RESEND v3 4/5] z3fold: use per-page spinlock Vitaly Wool
2017-02-01 15:06 ` Dan Streetman
2017-01-31 20:46 ` [PATCH/RESEND v3 5/5] z3fold: add kref refcounting Vitaly Wool
2017-02-01 15:07 ` Dan Streetman
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