On Wed, May 07, 2014 at 05:51:33PM -0400, Dan Streetman wrote: > Change zbud to store gfp_t flags passed at pool creation to use for > each alloc; this allows the api to be closer to the existing zsmalloc > interface, and the only current zbud user (zswap) uses the same gfp > flags for all allocs. Update zswap to use changed interface. >
Acked-by: Seth Jennings <[email protected]> > Signed-off-by: Dan Streetman <[email protected]> > Cc: Seth Jennings <[email protected]> > Cc: Weijie Yang <[email protected]> > --- > > Changes since v1 https://lkml.org/lkml/2014/4/19/98 > -context changes only; zbud_alloc parameter type changed since > last patch > > include/linux/zbud.h | 2 +- > mm/zbud.c | 27 +++++++++++++++------------ > mm/zswap.c | 6 +++--- > 3 files changed, 19 insertions(+), 16 deletions(-) > > diff --git a/include/linux/zbud.h b/include/linux/zbud.h > index 13af0d4..0b2534e 100644 > --- a/include/linux/zbud.h > +++ b/include/linux/zbud.h > @@ -11,7 +11,7 @@ struct zbud_ops { > > struct zbud_pool *zbud_create_pool(gfp_t gfp, struct zbud_ops *ops); > void zbud_destroy_pool(struct zbud_pool *pool); > -int zbud_alloc(struct zbud_pool *pool, unsigned int size, gfp_t gfp, > +int zbud_alloc(struct zbud_pool *pool, unsigned int size, > unsigned long *handle); > void zbud_free(struct zbud_pool *pool, unsigned long handle); > int zbud_reclaim_page(struct zbud_pool *pool, unsigned int retries); > diff --git a/mm/zbud.c b/mm/zbud.c > index 01df13a..847c01c 100644 > --- a/mm/zbud.c > +++ b/mm/zbud.c > @@ -94,6 +94,7 @@ struct zbud_pool { > struct list_head lru; > u64 pages_nr; > struct zbud_ops *ops; > + gfp_t gfp; > }; > > /* > @@ -193,9 +194,12 @@ static int num_free_chunks(struct zbud_header *zhdr) > *****************/ > /** > * zbud_create_pool() - create a new zbud pool > - * @gfp: gfp flags when allocating the zbud pool structure > + * @gfp: gfp flags when growing the pool > * @ops: user-defined operations for the zbud pool > * > + * gfp should not set __GFP_HIGHMEM as highmem pages cannot be used > + * as zbud pool pages. > + * > * Return: pointer to the new zbud pool or NULL if the metadata allocation > * failed. > */ > @@ -204,7 +208,9 @@ struct zbud_pool *zbud_create_pool(gfp_t gfp, struct > zbud_ops *ops) > struct zbud_pool *pool; > int i; > > - pool = kmalloc(sizeof(struct zbud_pool), gfp); > + if (gfp & __GFP_HIGHMEM) > + return NULL; > + pool = kmalloc(sizeof(struct zbud_pool), GFP_KERNEL); > if (!pool) > return NULL; > spin_lock_init(&pool->lock); > @@ -214,6 +220,7 @@ struct zbud_pool *zbud_create_pool(gfp_t gfp, struct > zbud_ops *ops) > INIT_LIST_HEAD(&pool->lru); > pool->pages_nr = 0; > pool->ops = ops; > + pool->gfp = gfp; > return pool; > } > > @@ -232,7 +239,6 @@ void zbud_destroy_pool(struct zbud_pool *pool) > * zbud_alloc() - allocates a region of a given size > * @pool: zbud pool from which to allocate > * @size: size in bytes of the desired allocation > - * @gfp: gfp flags used if the pool needs to grow > * @handle: handle of the new allocation > * > * This function will attempt to find a free region in the pool large enough > to > @@ -240,14 +246,11 @@ void zbud_destroy_pool(struct zbud_pool *pool) > * performed first. If no suitable free region is found, then a new page is > * allocated and added to the pool to satisfy the request. > * > - * gfp should not set __GFP_HIGHMEM as highmem pages cannot be used > - * as zbud pool pages. > - * > - * Return: 0 if success and handle is set, otherwise -EINVAL if the size or > - * gfp arguments are invalid or -ENOMEM if the pool was unable to allocate > - * a new page. > + * Return: 0 if success and @handle is set, -ENOSPC if the @size is too > large, > + * -EINVAL if the @size is 0, or -ENOMEM if the pool was unable to > + * allocate a new page. > */ > -int zbud_alloc(struct zbud_pool *pool, unsigned int size, gfp_t gfp, > +int zbud_alloc(struct zbud_pool *pool, unsigned int size, > unsigned long *handle) > { > int chunks, i, freechunks; > @@ -255,7 +258,7 @@ int zbud_alloc(struct zbud_pool *pool, unsigned int size, > gfp_t gfp, > enum buddy bud; > struct page *page; > > - if (!size || (gfp & __GFP_HIGHMEM)) > + if (!size) > return -EINVAL; > if (size > PAGE_SIZE - ZHDR_SIZE_ALIGNED - CHUNK_SIZE) > return -ENOSPC; > @@ -279,7 +282,7 @@ int zbud_alloc(struct zbud_pool *pool, unsigned int size, > gfp_t gfp, > > /* Couldn't find unbuddied zbud page, create new one */ > spin_unlock(&pool->lock); > - page = alloc_page(gfp); > + page = alloc_page(pool->gfp); > if (!page) > return -ENOMEM; > spin_lock(&pool->lock); > diff --git a/mm/zswap.c b/mm/zswap.c > index aeaef0f..1cc6770 100644 > --- a/mm/zswap.c > +++ b/mm/zswap.c > @@ -679,8 +679,7 @@ static int zswap_frontswap_store(unsigned type, pgoff_t > offset, > > /* store */ > len = dlen + sizeof(struct zswap_header); > - ret = zbud_alloc(zswap_pool, len, __GFP_NORETRY | __GFP_NOWARN, > - &handle); > + ret = zbud_alloc(zswap_pool, len, &handle); > if (ret == -ENOSPC) { > zswap_reject_compress_poor++; > goto freepage; > @@ -900,7 +899,8 @@ static int __init init_zswap(void) > > pr_info("loading zswap\n"); > > - zswap_pool = zbud_create_pool(GFP_KERNEL, &zswap_zbud_ops); > + zswap_pool = zbud_create_pool(__GFP_NORETRY | __GFP_NOWARN, > + &zswap_zbud_ops); > if (!zswap_pool) { > pr_err("zbud pool creation failed\n"); > goto error; > -- > 1.8.3.1 > > -- > To unsubscribe, send a message with 'unsubscribe linux-mm' in > the body to [email protected]. For more info on Linux MM, > see: http://www.linux-mm.org/ . > Don't email: <a href=mailto:"[email protected]";> [email protected] </a> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
