The patch titled
Subject: z3fold: make pages_nr atomic
has been added to the -mm tree. Its filename is
z3fold-make-pages_nr-atomic.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/z3fold-make-pages_nr-atomic.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/z3fold-make-pages_nr-atomic.patch
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------------------------------------------------------
From: Vitaly Wool <vitalywool@xxxxxxxxx>
Subject: z3fold: make pages_nr atomic
Convert pages_nr per-pool counter to atomic64_t.
Link: http://lkml.kernel.org/r/20170131213946.b828676ab17bbea42022c213@xxxxxxxxx
Signed-off-by: Vitaly Wool <vitalywool@xxxxxxxxx>
Cc: Dan Streetman <ddstreet@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/z3fold.c | 20 +++++++++-----------
1 file changed, 9 insertions(+), 11 deletions(-)
diff -puN mm/z3fold.c~z3fold-make-pages_nr-atomic mm/z3fold.c
--- a/mm/z3fold.c~z3fold-make-pages_nr-atomic
+++ a/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
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_po
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_po
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_po
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 @@ next:
*/
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_p
* 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);
}
/*****************
_
Patches currently in -mm which might be from vitalywool@xxxxxxxxx are
z3fold-make-pages_nr-atomic.patch
z3fold-fix-header-size-related-issues.patch
z3fold-extend-compaction-function.patch
z3fold-use-per-page-spinlock.patch
z3fold-add-kref-refcounting.patch
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