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Date: Thu, 24 Jan 2013 16:08:05 -0800
From: Nitin Gupta <ngupta@...are.org>
To: Seth Jennings <sjenning@...ux.vnet.ibm.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Minchan Kim <minchan@...nel.org>,
Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
Dan Magenheimer <dan.magenheimer@...cle.com>,
Robert Jennings <rcj@...ux.vnet.ibm.com>,
Jenifer Hopper <jhopper@...ibm.com>,
Mel Gorman <mgorman@...e.de>,
Johannes Weiner <jweiner@...hat.com>,
Rik van Riel <riel@...hat.com>,
Larry Woodman <lwoodman@...hat.com>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org
Subject: Re: [PATCHv2 1/9] staging: zsmalloc: add gfp flags to zs_create_pool
On Mon, Jan 7, 2013 at 12:24 PM, Seth Jennings
<sjenning@...ux.vnet.ibm.com> wrote:
> zs_create_pool() currently takes a gfp flags argument
> that is used when growing the memory pool. However
> it is not used in allocating the metadata for the pool
> itself. That is currently hardcoded to GFP_KERNEL.
>
> zswap calls zs_create_pool() at swapon time which is done
> in atomic context, resulting in a "might sleep" warning.
>
> This patch changes the meaning of the flags argument in
> zs_create_pool() to mean the flags for the metadata allocation,
> and adds a flags argument to zs_malloc that will be used for
> memory pool growth if required.
>
> Signed-off-by: Seth Jennings <sjenning@...ux.vnet.ibm.com>
> ---
> drivers/staging/zcache/zcache-main.c | 4 ++--
> drivers/staging/zram/zram_drv.c | 4 ++--
> drivers/staging/zsmalloc/zsmalloc-main.c | 9 +++------
> drivers/staging/zsmalloc/zsmalloc.h | 2 +-
> 4 files changed, 8 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/staging/zcache/zcache-main.c b/drivers/staging/zcache/zcache-main.c
> index 52b43b7..674c754 100644
> --- a/drivers/staging/zcache/zcache-main.c
> +++ b/drivers/staging/zcache/zcache-main.c
> @@ -711,7 +711,7 @@ static unsigned long zv_create(struct zs_pool *pool, uint32_t pool_id,
>
> BUG_ON(!irqs_disabled());
> BUG_ON(chunks >= NCHUNKS);
> - handle = zs_malloc(pool, size);
> + handle = zs_malloc(pool, size, ZCACHE_GFP_MASK);
> if (!handle)
> goto out;
> atomic_inc(&zv_curr_dist_counts[chunks]);
> @@ -982,7 +982,7 @@ int zcache_new_client(uint16_t cli_id)
> goto out;
> cli->allocated = 1;
> #ifdef CONFIG_FRONTSWAP
> - cli->zspool = zs_create_pool("zcache", ZCACHE_GFP_MASK);
> + cli->zspool = zs_create_pool("zcache", GFP_KERNEL);
> if (cli->zspool == NULL)
> goto out;
> idr_init(&cli->tmem_pools);
> diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c
> index fb4a7c9..13e9b4b 100644
> --- a/drivers/staging/zram/zram_drv.c
> +++ b/drivers/staging/zram/zram_drv.c
> @@ -336,7 +336,7 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index,
> clen = PAGE_SIZE;
> }
>
> - handle = zs_malloc(zram->mem_pool, clen);
> + handle = zs_malloc(zram->mem_pool, clen, GFP_NOIO | __GFP_HIGHMEM);
> if (!handle) {
> pr_info("Error allocating memory for compressed "
> "page: %u, size=%zu\n", index, clen);
> @@ -576,7 +576,7 @@ int zram_init_device(struct zram *zram)
> /* zram devices sort of resembles non-rotational disks */
> queue_flag_set_unlocked(QUEUE_FLAG_NONROT, zram->disk->queue);
>
> - zram->mem_pool = zs_create_pool("zram", GFP_NOIO | __GFP_HIGHMEM);
> + zram->mem_pool = zs_create_pool("zram", GFP_KERNEL);
> if (!zram->mem_pool) {
> pr_err("Error creating memory pool\n");
> ret = -ENOMEM;
> diff --git a/drivers/staging/zsmalloc/zsmalloc-main.c b/drivers/staging/zsmalloc/zsmalloc-main.c
> index 09a9d35..6ff380e 100644
> --- a/drivers/staging/zsmalloc/zsmalloc-main.c
> +++ b/drivers/staging/zsmalloc/zsmalloc-main.c
> @@ -205,8 +205,6 @@ struct link_free {
>
> struct zs_pool {
> struct size_class size_class[ZS_SIZE_CLASSES];
> -
> - gfp_t flags; /* allocation flags used when growing pool */
> const char *name;
> };
>
> @@ -807,7 +805,7 @@ struct zs_pool *zs_create_pool(const char *name, gfp_t flags)
> return NULL;
>
> ovhd_size = roundup(sizeof(*pool), PAGE_SIZE);
> - pool = kzalloc(ovhd_size, GFP_KERNEL);
> + pool = kzalloc(ovhd_size, flags);
> if (!pool)
> return NULL;
>
> @@ -827,7 +825,6 @@ struct zs_pool *zs_create_pool(const char *name, gfp_t flags)
>
> }
>
> - pool->flags = flags;
> pool->name = name;
>
> return pool;
> @@ -863,7 +860,7 @@ EXPORT_SYMBOL_GPL(zs_destroy_pool);
> * otherwise 0.
> * Allocation requests with size > ZS_MAX_ALLOC_SIZE will fail.
> */
> -unsigned long zs_malloc(struct zs_pool *pool, size_t size)
> +unsigned long zs_malloc(struct zs_pool *pool, size_t size, gfp_t flags)
> {
> unsigned long obj;
> struct link_free *link;
> @@ -885,7 +882,7 @@ unsigned long zs_malloc(struct zs_pool *pool, size_t size)
>
> if (!first_page) {
> spin_unlock(&class->lock);
> - first_page = alloc_zspage(class, pool->flags);
> + first_page = alloc_zspage(class, flags);
> if (unlikely(!first_page))
> return 0;
>
> diff --git a/drivers/staging/zsmalloc/zsmalloc.h b/drivers/staging/zsmalloc/zsmalloc.h
> index de2e8bf..907ff03 100644
> --- a/drivers/staging/zsmalloc/zsmalloc.h
> +++ b/drivers/staging/zsmalloc/zsmalloc.h
> @@ -31,7 +31,7 @@ struct zs_pool;
> struct zs_pool *zs_create_pool(const char *name, gfp_t flags);
> void zs_destroy_pool(struct zs_pool *pool);
>
> -unsigned long zs_malloc(struct zs_pool *pool, size_t size);
> +unsigned long zs_malloc(struct zs_pool *pool, size_t size, gfp_t flags);
> void zs_free(struct zs_pool *pool, unsigned long obj);
>
> void *zs_map_object(struct zs_pool *pool, unsigned long handle,
> --
> 1.7.9.5
>
> --
The additional of flags, especially for zs_create_pool seems not so
obvious so should be documented as function comment. Otherwise,
looks good to me.
Acked-by: Nitin Gupta <ngupta@...are.org>
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