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Date: Tue, 15 Sep 2015 10:12:49 +0900
From: Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To: Vitaly Wool <vitalywool@...il.com>
Cc: minchan@...nel.org, sergey.senozhatsky@...il.com,
ddstreet@...e.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 3/3] zram: use common zpool interface
On (09/14/15 15:55), Vitaly Wool wrote:
> Update zram driver to use common zpool API instead of calling
> zsmalloc functions directly. This patch also adds a parameter
> that allows for changing underlying compressor storage to zbud.
>
> Signed-off-by: Vitaly Wool <vitalywool@...il.com>
> ---
> drivers/block/zram/Kconfig | 3 ++-
> drivers/block/zram/zram_drv.c | 44 ++++++++++++++++++++++++-------------------
> drivers/block/zram/zram_drv.h | 4 ++--
> 3 files changed, 29 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/block/zram/Kconfig b/drivers/block/zram/Kconfig
> index 386ba3d..4831d0a 100644
> --- a/drivers/block/zram/Kconfig
> +++ b/drivers/block/zram/Kconfig
> @@ -1,6 +1,7 @@
> config ZRAM
> tristate "Compressed RAM block device support"
> - depends on BLOCK && SYSFS && ZSMALLOC
> + depends on BLOCK && SYSFS
> + select ZPOOL
well, in that case, all `#ifdef CONFIG_ZPOOL' in zsmalloc can be dropped,
because now it's a must have.
> select LZO_COMPRESS
> select LZO_DECOMPRESS
> default n
> diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
> index 49d5a65..2829c3d 100644
> --- a/drivers/block/zram/zram_drv.c
> +++ b/drivers/block/zram/zram_drv.c
> @@ -44,6 +44,9 @@ static const char *default_compressor = "lzo";
> static unsigned int num_devices = 1;
> static size_t max_zpage_size = PAGE_SIZE / 4 * 3;
>
> +#define ZRAM_ZPOOL_DEFAULT "zsmalloc"
> +static char *pool_type = ZRAM_ZPOOL_DEFAULT;
> +
> static inline void deprecated_attr_warn(const char *name)
> {
> pr_warn_once("%d (%s) Attribute %s (and others) will be removed. %s\n",
> @@ -229,11 +232,11 @@ static ssize_t mem_used_total_show(struct device *dev,
> down_read(&zram->init_lock);
> if (init_done(zram)) {
> struct zram_meta *meta = zram->meta;
> - val = zs_get_total_pages(meta->mem_pool);
> + val = zpool_get_total_size(meta->mem_pool);
> }
> up_read(&zram->init_lock);
>
> - return scnprintf(buf, PAGE_SIZE, "%llu\n", val << PAGE_SHIFT);
> + return scnprintf(buf, PAGE_SIZE, "%llu\n", val);
> }
>
> static ssize_t mem_limit_show(struct device *dev,
> @@ -298,7 +301,7 @@ static ssize_t mem_used_max_store(struct device *dev,
> if (init_done(zram)) {
> struct zram_meta *meta = zram->meta;
> atomic_long_set(&zram->stats.max_used_pages,
> - zs_get_total_pages(meta->mem_pool));
> + zpool_get_total_size(meta->mem_pool) >> PAGE_SHIFT);
> }
> up_read(&zram->init_lock);
>
> @@ -399,7 +402,7 @@ static ssize_t compact_store(struct device *dev,
> }
>
> meta = zram->meta;
> - zs_compact(meta->mem_pool);
> + zpool_compact(meta->mem_pool, NULL);
so you don't use that 'compacted' param.
> up_read(&zram->init_lock);
>
> return len;
> @@ -436,8 +439,8 @@ static ssize_t mm_stat_show(struct device *dev,
>
> down_read(&zram->init_lock);
> if (init_done(zram)) {
> - mem_used = zs_get_total_pages(zram->meta->mem_pool);
> - zs_pool_stats(zram->meta->mem_pool, &pool_stats);
> + mem_used = zpool_get_total_size(zram->meta->mem_pool);
> + zpool_stats(zram->meta->mem_pool, &pool_stats);
> }
>
> orig_size = atomic64_read(&zram->stats.pages_stored);
> @@ -447,7 +450,7 @@ static ssize_t mm_stat_show(struct device *dev,
> "%8llu %8llu %8llu %8lu %8ld %8llu %8lu\n",
> orig_size << PAGE_SHIFT,
> (u64)atomic64_read(&zram->stats.compr_data_size),
> - mem_used << PAGE_SHIFT,
> + mem_used,
> zram->limit_pages << PAGE_SHIFT,
> max_used << PAGE_SHIFT,
> (u64)atomic64_read(&zram->stats.zero_pages),
> @@ -492,10 +495,10 @@ static void zram_meta_free(struct zram_meta *meta, u64 disksize)
> if (!handle)
> continue;
>
> - zs_free(meta->mem_pool, handle);
> + zpool_free(meta->mem_pool, handle);
> }
>
> - zs_destroy_pool(meta->mem_pool);
> + zpool_destroy_pool(meta->mem_pool);
> vfree(meta->table);
> kfree(meta);
> }
> @@ -515,7 +518,8 @@ static struct zram_meta *zram_meta_alloc(char *pool_name, u64 disksize)
> goto out_error;
> }
>
> - meta->mem_pool = zs_create_pool(pool_name, GFP_NOIO | __GFP_HIGHMEM);
> + meta->mem_pool = zpool_create_pool(pool_type, pool_name,
> + GFP_NOIO | __GFP_HIGHMEM, NULL);
> if (!meta->mem_pool) {
> pr_err("Error creating memory pool\n");
> goto out_error;
> @@ -551,7 +555,7 @@ static void zram_free_page(struct zram *zram, size_t index)
> return;
> }
>
> - zs_free(meta->mem_pool, handle);
> + zpool_free(meta->mem_pool, handle);
>
> atomic64_sub(zram_get_obj_size(meta, index),
> &zram->stats.compr_data_size);
> @@ -579,12 +583,12 @@ static int zram_decompress_page(struct zram *zram, char *mem, u32 index)
> return 0;
> }
>
> - cmem = zs_map_object(meta->mem_pool, handle, ZS_MM_RO);
> + cmem = zpool_map_handle(meta->mem_pool, handle, ZPOOL_MM_RO);
> if (size == PAGE_SIZE)
> copy_page(mem, cmem);
> else
> ret = zcomp_decompress(zram->comp, cmem, size, mem);
> - zs_unmap_object(meta->mem_pool, handle);
> + zpool_unmap_handle(meta->mem_pool, handle);
> bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
>
> /* Should NEVER happen. Return bio error if it does. */
> @@ -718,24 +722,24 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index,
> src = uncmem;
> }
>
> - handle = zs_malloc(meta->mem_pool, clen);
> - if (!handle) {
> + if (zpool_malloc(meta->mem_pool, clen, __GFP_IO | __GFP_NOWARN,
hm, GFP_NOIO and __GFP_IO...
> + &handle) != 0) {
> pr_err("Error allocating memory for compressed page: %u, size=%zu\n",
> index, clen);
> ret = -ENOMEM;
> goto out;
> }
>
> - alloced_pages = zs_get_total_pages(meta->mem_pool);
> + alloced_pages = zpool_get_total_size(meta->mem_pool) >> PAGE_SHIFT;
> if (zram->limit_pages && alloced_pages > zram->limit_pages) {
> - zs_free(meta->mem_pool, handle);
> + zpool_free(meta->mem_pool, handle);
> ret = -ENOMEM;
> goto out;
> }
>
> update_used_max(zram, alloced_pages);
>
> - cmem = zs_map_object(meta->mem_pool, handle, ZS_MM_WO);
> + cmem = zpool_map_handle(meta->mem_pool, handle, ZPOOL_MM_WO);
>
> if ((clen == PAGE_SIZE) && !is_partial_io(bvec)) {
> src = kmap_atomic(page);
> @@ -747,7 +751,7 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index,
>
> zcomp_strm_release(zram->comp, zstrm);
> zstrm = NULL;
> - zs_unmap_object(meta->mem_pool, handle);
> + zpool_unmap_handle(meta->mem_pool, handle);
>
> /*
> * Free memory associated with this sector
> @@ -1457,6 +1461,8 @@ module_param(num_devices, uint, 0);
> MODULE_PARM_DESC(num_devices, "Number of pre-created zram devices");
> module_param(max_zpage_size, ulong, 0);
> MODULE_PARM_DESC(max_zpage_size, "Threshold for storing compressed pages");
> +module_param_named(zpool_type, pool_type, charp, 0444);
> +MODULE_PARM_DESC(zpool_type, "zpool implementation selection (zsmalloc vs zbud)");
>
> MODULE_LICENSE("Dual BSD/GPL");
> MODULE_AUTHOR("Nitin Gupta <ngupta@...are.org>");
> diff --git a/drivers/block/zram/zram_drv.h b/drivers/block/zram/zram_drv.h
> index 3a29c33..9a64b94 100644
> --- a/drivers/block/zram/zram_drv.h
> +++ b/drivers/block/zram/zram_drv.h
> @@ -16,7 +16,7 @@
> #define _ZRAM_DRV_H_
>
> #include <linux/spinlock.h>
> -#include <linux/zsmalloc.h>
> +#include <linux/zpool.h>
>
> #include "zcomp.h"
>
> @@ -73,7 +73,7 @@ struct zram_stats {
>
> struct zram_meta {
> struct zram_table_entry *table;
> - struct zs_pool *mem_pool;
> + struct zpool *mem_pool;
> };
>
> struct zram {
> --
> 1.9.1
>
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