On Tue, Aug 19, 2014 at 09:46:28AM -0500, Seth Jennings wrote:
> On Tue, Aug 19, 2014 at 04:54:45PM +0900, Minchan Kim wrote:
> > zs_get_total_size_bytes returns a amount of memory zsmalloc
> > consumed with *byte unit* but zsmalloc operates *page unit*
> > rather than byte unit so let's change the API so benefit
> > we could get is that reduce unnecessary overhead
> > (ie, change page unit with byte unit) in zsmalloc.
> >
> > Now, zswap can rollback to zswap_pool_pages.
> > Over to zswap guys ;-)
>
> I don't think that's how is it done :-/ Changing the API for a
> component that has two users, changing one, then saying "hope you guys
> change your newly broken stuff".
However, I'll bite on this one :) Just squash this in so that
zpool/zswap aren't broken at any point.
Dan, care to make sure I didn't miss something?
Thanks,
Seth
diff --git a/mm/zbud.c b/mm/zbud.c
index a05790b..27a3701 100644
--- a/mm/zbud.c
+++ b/mm/zbud.c
@@ -179,7 +179,7 @@ static void zbud_zpool_unmap(void *pool, unsigned long
handle)
static u64 zbud_zpool_total_size(void *pool)
{
- return zbud_get_pool_size(pool) * PAGE_SIZE;
+ return zbud_get_pool_size(pool);
}
static struct zpool_driver zbud_zpool_driver = {
diff --git a/mm/zpool.c b/mm/zpool.c
index e40612a..d126ebc 100644
--- a/mm/zpool.c
+++ b/mm/zpool.c
@@ -336,9 +336,9 @@ void zpool_unmap_handle(struct zpool *zpool, unsigned long
handle)
* zpool_get_total_size() - The total size of the pool
* @pool The zpool to check
*
- * This returns the total size in bytes of the pool.
+ * This returns the total size in pages of the pool.
*
- * Returns: Total size of the zpool in bytes.
+ * Returns: Total size of the zpool in pages.
*/
u64 zpool_get_total_size(struct zpool *zpool)
{
diff --git a/mm/zswap.c b/mm/zswap.c
index ea064c1..124f750 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -45,8 +45,8 @@
/*********************************
* statistics
**********************************/
-/* Total bytes used by the compressed storage */
-static u64 zswap_pool_total_size;
+/* Total pages used by the compressed storage */
+static u64 zswap_pool_pages;
/* The number of compressed pages currently stored in zswap */
static atomic_t zswap_stored_pages = ATOMIC_INIT(0);
@@ -297,7 +297,7 @@ static void zswap_free_entry(struct zswap_entry *entry)
zpool_free(zswap_pool, entry->handle);
zswap_entry_cache_free(entry);
atomic_dec(&zswap_stored_pages);
- zswap_pool_total_size = zpool_get_total_size(zswap_pool);
+ zswap_pool_pages = zpool_get_total_size(zswap_pool);
}
/* caller must hold the tree lock */
@@ -414,7 +414,7 @@ cleanup:
static bool zswap_is_full(void)
{
return totalram_pages * zswap_max_pool_percent / 100 <
- DIV_ROUND_UP(zswap_pool_total_size, PAGE_SIZE);
+ zswap_pool_pages;
}
/*********************************
@@ -721,7 +721,7 @@ static int zswap_frontswap_store(unsigned type, pgoff_t
offset,
/* update stats */
atomic_inc(&zswap_stored_pages);
- zswap_pool_total_size = zpool_get_total_size(zswap_pool);
+ zswap_pool_pages = zpool_get_total_size(zswap_pool);
return 0;
@@ -874,8 +874,8 @@ static int __init zswap_debugfs_init(void)
zswap_debugfs_root, &zswap_written_back_pages);
debugfs_create_u64("duplicate_entry", S_IRUGO,
zswap_debugfs_root, &zswap_duplicate_entry);
- debugfs_create_u64("pool_total_size", S_IRUGO,
- zswap_debugfs_root, &zswap_pool_total_size);
+ debugfs_create_u64("pool_pages", S_IRUGO,
+ zswap_debugfs_root, &zswap_pool_pages);
debugfs_create_atomic_t("stored_pages", S_IRUGO,
zswap_debugfs_root, &zswap_stored_pages);
--
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