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Date: Tue, 15 Sep 2015 10:06:30 +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 2/3] zpool/zsmalloc/zbud: align on interfaces
On (09/14/15 15:51), Vitaly Wool wrote:
> As a preparation step for zram to be able to use common zpool API,
> there has to be some alignment done on it. This patch adds
> functions that correspond to zsmalloc-specific API to the common
> zpool API and takes care of the callbacks that have to be
> introduced, too.
>
> Signed-off-by: Vitaly Wool <vitalywool@...il.com>
> ---
> drivers/block/zram/zram_drv.c | 4 ++--
> include/linux/zpool.h | 14 ++++++++++++++
> include/linux/zsmalloc.h | 8 ++------
> mm/zbud.c | 12 ++++++++++++
> mm/zpool.c | 22 ++++++++++++++++++++++
> mm/zsmalloc.c | 23 ++++++++++++++++++++---
> 6 files changed, 72 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
> index 6d9f1d1..49d5a65 100644
> --- a/drivers/block/zram/zram_drv.c
> +++ b/drivers/block/zram/zram_drv.c
> @@ -427,12 +427,12 @@ static ssize_t mm_stat_show(struct device *dev,
> struct device_attribute *attr, char *buf)
> {
> struct zram *zram = dev_to_zram(dev);
> - struct zs_pool_stats pool_stats;
> + struct zpool_stats pool_stats;
> u64 orig_size, mem_used = 0;
> long max_used;
> ssize_t ret;
>
> - memset(&pool_stats, 0x00, sizeof(struct zs_pool_stats));
> + memset(&pool_stats, 0x00, sizeof(struct zpool_stats));
>
> down_read(&zram->init_lock);
> if (init_done(zram)) {
> diff --git a/include/linux/zpool.h b/include/linux/zpool.h
> index 42f8ec9..f64cf86 100644
> --- a/include/linux/zpool.h
> +++ b/include/linux/zpool.h
> @@ -17,6 +17,11 @@ struct zpool_ops {
> int (*evict)(struct zpool *pool, unsigned long handle);
> };
>
> +struct zpool_stats {
> + /* How many pages were migrated (freed) */
> + unsigned long pages_compacted;
> +};
> +
> /*
> * Control how a handle is mapped. It will be ignored if the
> * implementation does not support it. Its use is optional.
> @@ -58,6 +63,10 @@ void *zpool_map_handle(struct zpool *pool, unsigned long handle,
>
> void zpool_unmap_handle(struct zpool *pool, unsigned long handle);
>
> +int zpool_compact(struct zpool *pool, unsigned long *compacted);
I see no reason for having this `unsigned long *compacted` param.
> +void zpool_stats(struct zpool *pool, struct zpool_stats *zstats);
> +
> u64 zpool_get_total_size(struct zpool *pool);
>
>
> @@ -72,6 +81,8 @@ u64 zpool_get_total_size(struct zpool *pool);
> * @shrink: shrink the pool.
> * @map: map a handle.
> * @unmap: unmap a handle.
> + * @compact: try to run compaction for the pool
> + * @stats: get statistics for the pool
> * @total_size: get total size of a pool.
> *
> * This is created by a zpool implementation and registered
> @@ -98,6 +109,9 @@ struct zpool_driver {
> enum zpool_mapmode mm);
> void (*unmap)(void *pool, unsigned long handle);
>
> + int (*compact)(void *pool, unsigned long *compacted);
> + void (*stats)(void *pool, struct zpool_stats *stats);
> +
> u64 (*total_size)(void *pool);
> };
>
> diff --git a/include/linux/zsmalloc.h b/include/linux/zsmalloc.h
> index 6398dfa..5aee1c7 100644
> --- a/include/linux/zsmalloc.h
> +++ b/include/linux/zsmalloc.h
> @@ -15,6 +15,7 @@
> #define _ZS_MALLOC_H_
>
> #include <linux/types.h>
> +#include <linux/zpool.h>
>
> /*
> * zsmalloc mapping modes
> @@ -34,11 +35,6 @@ enum zs_mapmode {
> */
> };
>
> -struct zs_pool_stats {
> - /* How many pages were migrated (freed) */
> - unsigned long pages_compacted;
> -};
> -
> struct zs_pool;
>
> struct zs_pool *zs_create_pool(char *name, gfp_t flags);
> @@ -54,5 +50,5 @@ void zs_unmap_object(struct zs_pool *pool, unsigned long handle);
> unsigned long zs_get_total_pages(struct zs_pool *pool);
> unsigned long zs_compact(struct zs_pool *pool);
>
> -void zs_pool_stats(struct zs_pool *pool, struct zs_pool_stats *stats);
> +void zs_pool_stats(struct zs_pool *pool, struct zpool_stats *stats);
> #endif
> diff --git a/mm/zbud.c b/mm/zbud.c
> index fa48bcdf..0963342 100644
> --- a/mm/zbud.c
> +++ b/mm/zbud.c
> @@ -195,6 +195,16 @@ static void zbud_zpool_unmap(void *pool, unsigned long handle)
> zbud_unmap(pool, handle);
> }
>
> +static int zbud_zpool_compact(void *pool, unsigned long *compacted)
> +{
> + return -EINVAL;
> +}
> +
> +static void zbud_zpool_stats(void *pool, struct zpool_stats *stats)
> +{
> + /* no-op */
> +}
> +
> static u64 zbud_zpool_total_size(void *pool)
> {
> return zbud_get_pool_size(pool) * PAGE_SIZE;
> @@ -210,6 +220,8 @@ static struct zpool_driver zbud_zpool_driver = {
> .shrink = zbud_zpool_shrink,
> .map = zbud_zpool_map,
> .unmap = zbud_zpool_unmap,
> + .compact = zbud_zpool_compact,
> + .stats = zbud_zpool_stats,
> .total_size = zbud_zpool_total_size,
> };
>
> diff --git a/mm/zpool.c b/mm/zpool.c
> index 8f670d3..15a171a 100644
> --- a/mm/zpool.c
> +++ b/mm/zpool.c
> @@ -341,6 +341,28 @@ void zpool_unmap_handle(struct zpool *zpool, unsigned long handle)
> }
>
> /**
> + * zpool_compact() - try to run compaction over zpool
> + * @pool The zpool to compact
> + * @compacted The number of migrated pages
> + *
> + * Returns: 0 on success, error code otherwise
> + */
> +int zpool_compact(struct zpool *zpool, unsigned long *compacted)
> +{
> + return zpool->driver->compact(zpool->pool, compacted);
> +}
> +
> +/**
> + * zpool_stats() - obtain zpool statistics
> + * @pool The zpool to get statistics for
> + * @zstats stats to fill in
> + */
> +void zpool_stats(struct zpool *zpool, struct zpool_stats *zstats)
> +{
> + zpool->driver->stats(zpool->pool, zstats);
> +}
> +
> +/**
> * zpool_get_total_size() - The total size of the pool
> * @pool The zpool to check
> *
> diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
> index f135b1b..f002f57 100644
> --- a/mm/zsmalloc.c
> +++ b/mm/zsmalloc.c
> @@ -245,7 +245,7 @@ struct zs_pool {
> gfp_t flags; /* allocation flags used when growing pool */
> atomic_long_t pages_allocated;
>
> - struct zs_pool_stats stats;
> + struct zpool_stats stats;
>
> /* Compact classes */
> struct shrinker shrinker;
> @@ -365,6 +365,21 @@ static void zs_zpool_unmap(void *pool, unsigned long handle)
> zs_unmap_object(pool, handle);
> }
>
> +static int zs_zpool_compact(void *pool, unsigned long *compacted)
> +{
> + unsigned long c = zs_compact(pool);
> +
> + if (compacted)
> + *compacted = c;
why not "return zs_compact(pool)"?
> + return 0;
> +}
> +
> +
> +static void zs_zpool_stats(void *pool, struct zpool_stats *stats)
> +{
> + zs_pool_stats(pool, stats);
> +}
> +
> static u64 zs_zpool_total_size(void *pool)
> {
> return zs_get_total_pages(pool) << PAGE_SHIFT;
> @@ -380,6 +395,8 @@ static struct zpool_driver zs_zpool_driver = {
> .shrink = zs_zpool_shrink,
> .map = zs_zpool_map,
> .unmap = zs_zpool_unmap,
> + .compact = zs_zpool_compact,
> + .stats = zs_zpool_stats,
> .total_size = zs_zpool_total_size,
> };
>
> @@ -1789,9 +1806,9 @@ unsigned long zs_compact(struct zs_pool *pool)
> }
> EXPORT_SYMBOL_GPL(zs_compact);
>
> -void zs_pool_stats(struct zs_pool *pool, struct zs_pool_stats *stats)
> +void zs_pool_stats(struct zs_pool *pool, struct zpool_stats *stats)
> {
> - memcpy(stats, &pool->stats, sizeof(struct zs_pool_stats));
> + memcpy(stats, &pool->stats, sizeof(struct zpool_stats));
> }
> EXPORT_SYMBOL_GPL(zs_pool_stats);
>
> --
> 1.9.1
>
> --
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