On Tue, Aug 19, 2014 at 10:11:57AM -0500, Seth Jennings wrote:
> 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
Thanks for the eating but it's not what I wanted.
I'd like to leave current semantic of zpool and up to you to roll back
to old time. ;-)
> 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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--
Kind regards,
Minchan Kim
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