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Date: Wed, 15 Jun 2016 22:42:07 +0800
From: Geliang Tang <geliangtang@...il.com>
To: Minchan Kim <minchan@...nel.org>, Nitin Gupta <ngupta@...are.org>,
Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
Dan Streetman <ddstreet@...e.org>,
Vitaly Wool <vitalywool@...il.com>
Cc: Geliang Tang <geliangtang@...il.com>, linux-kernel@...r.kernel.org,
linux-mm@...ck.org
Subject: [PATCH] zram: update zram to use zpool
Change zram to use the zpool api instead of directly using zsmalloc.
The zpool api doesn't have zs_compact() and zs_pool_stats() functions.
I did the following two things to fix it.
1) I replace zs_compact() with zpool_shrink(), use zpool_shrink() to
call zs_compact() in zsmalloc.
2) The 'pages_compacted' attribute is showed in zram by calling
zs_pool_stats(). So in order not to call zs_pool_state() I move the
attribute to zsmalloc.
Signed-off-by: Geliang Tang <geliangtang@...il.com>
---
drivers/block/zram/Kconfig | 3 ++-
drivers/block/zram/zram_drv.c | 59 ++++++++++++++++++++++---------------------
drivers/block/zram/zram_drv.h | 4 +--
mm/zsmalloc.c | 12 +++++----
4 files changed, 41 insertions(+), 37 deletions(-)
diff --git a/drivers/block/zram/Kconfig b/drivers/block/zram/Kconfig
index b8ecba6..6389a5a 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 && CRYPTO
+ depends on BLOCK && SYSFS && ZPOOL && CRYPTO
+ select ZSMALLOC
select CRYPTO_LZO
default n
help
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 7454cf1..7ee9050 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -39,6 +39,7 @@ static DEFINE_MUTEX(zram_index_mutex);
static int zram_major;
static const char *default_compressor = "lzo";
+static char *default_zpool_type = "zsmalloc";
/* Module params (documentation at end) */
static unsigned int num_devices = 1;
@@ -228,11 +229,11 @@ 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,
@@ -297,7 +298,7 @@ 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);
@@ -379,7 +380,7 @@ static ssize_t compact_store(struct device *dev,
}
meta = zram->meta;
- zs_compact(meta->mem_pool);
+ zpool_shrink(meta->mem_pool, 0, NULL);
up_read(&zram->init_lock);
return len;
@@ -407,31 +408,25 @@ 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;
u64 orig_size, mem_used = 0;
long max_used;
ssize_t ret;
- memset(&pool_stats, 0x00, sizeof(struct zs_pool_stats));
-
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);
- }
+ if (init_done(zram))
+ mem_used = zpool_get_total_size(zram->meta->mem_pool);
orig_size = atomic64_read(&zram->stats.pages_stored);
max_used = atomic_long_read(&zram->stats.max_used_pages);
ret = scnprintf(buf, PAGE_SIZE,
- "%8llu %8llu %8llu %8lu %8ld %8llu %8lu\n",
+ "%8llu %8llu %8llu %8lu %8ld %8llu\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),
- pool_stats.pages_compacted);
+ (u64)atomic64_read(&zram->stats.zero_pages));
up_read(&zram->init_lock);
return ret;
@@ -490,10 +485,10 @@ 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);
}
@@ -513,7 +508,13 @@ static struct zram_meta *zram_meta_alloc(char *pool_name, u64 disksize)
goto out_error;
}
- meta->mem_pool = zs_create_pool(pool_name);
+ if (!zpool_has_pool(default_zpool_type)) {
+ pr_err("zpool %s not available\n", default_zpool_type);
+ goto out_error;
+ }
+
+ meta->mem_pool = zpool_create_pool(default_zpool_type,
+ pool_name, 0, NULL);
if (!meta->mem_pool) {
pr_err("Error creating memory pool\n");
goto out_error;
@@ -549,7 +550,7 @@ 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);
@@ -577,7 +578,7 @@ 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 {
@@ -586,7 +587,7 @@ static int zram_decompress_page(struct zram *zram, char *mem, u32 index)
ret = zcomp_decompress(zstrm, cmem, size, mem);
zcomp_stream_put(zram->comp);
}
- 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. */
@@ -735,20 +736,20 @@ compress_again:
* from the slow path and handle has already been allocated.
*/
if (!handle)
- handle = zs_malloc(meta->mem_pool, clen,
+ ret = zpool_malloc(meta->mem_pool, clen,
__GFP_KSWAPD_RECLAIM |
__GFP_NOWARN |
__GFP_HIGHMEM |
- __GFP_MOVABLE);
+ __GFP_MOVABLE, &handle);
if (!handle) {
zcomp_stream_put(zram->comp);
zstrm = NULL;
atomic64_inc(&zram->stats.writestall);
- handle = zs_malloc(meta->mem_pool, clen,
+ ret = zpool_malloc(meta->mem_pool, clen,
GFP_NOIO | __GFP_HIGHMEM |
- __GFP_MOVABLE);
+ __GFP_MOVABLE, &handle);
if (handle)
goto compress_again;
@@ -758,16 +759,16 @@ compress_again:
goto out;
}
- alloced_pages = zs_get_total_pages(meta->mem_pool);
+ alloced_pages = zpool_get_total_size(meta->mem_pool) >> PAGE_SHIFT;
update_used_max(zram, alloced_pages);
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;
}
- 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);
@@ -779,7 +780,7 @@ compress_again:
zcomp_stream_put(zram->comp);
zstrm = NULL;
- zs_unmap_object(meta->mem_pool, handle);
+ zpool_unmap_handle(meta->mem_pool, handle);
/*
* Free memory associated with this sector
diff --git a/drivers/block/zram/zram_drv.h b/drivers/block/zram/zram_drv.h
index 74fcf10..de3e013 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/rwsem.h>
-#include <linux/zsmalloc.h>
+#include <linux/zpool.h>
#include <linux/crypto.h>
#include "zcomp.h"
@@ -91,7 +91,7 @@ struct zram_stats {
struct zram_meta {
struct zram_table_entry *table;
- struct zs_pool *mem_pool;
+ struct zpool *mem_pool;
};
struct zram {
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 6a58edc..56e6439 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -421,7 +421,8 @@ static void zs_zpool_free(void *pool, unsigned long handle)
static int zs_zpool_shrink(void *pool, unsigned int pages,
unsigned int *reclaimed)
{
- return -EINVAL;
+ zs_compact(pool);
+ return 0;
}
static void *zs_zpool_map(void *pool, unsigned long handle,
@@ -609,10 +610,10 @@ static int zs_stats_size_show(struct seq_file *s, void *v)
unsigned long total_objs = 0, total_used_objs = 0, total_pages = 0;
unsigned long total_freeable = 0;
- seq_printf(s, " %5s %5s %11s %12s %13s %10s %10s %16s %8s\n",
+ seq_printf(s, " %5s %5s %11s %12s %13s %10s %10s %16s %8s %15s\n",
"class", "size", "almost_full", "almost_empty",
"obj_allocated", "obj_used", "pages_used",
- "pages_per_zspage", "freeable");
+ "pages_per_zspage", "freeable", "pages_compacted");
for (i = 0; i < zs_size_classes; i++) {
class = pool->size_class[i];
@@ -648,10 +649,11 @@ static int zs_stats_size_show(struct seq_file *s, void *v)
}
seq_puts(s, "\n");
- seq_printf(s, " %5s %5s %11lu %12lu %13lu %10lu %10lu %16s %8lu\n",
+ seq_printf(s, " %5s %5s %11lu %12lu %13lu %10lu %10lu %16s %8lu %15lu\n",
"Total", "", total_class_almost_full,
total_class_almost_empty, total_objs,
- total_used_objs, total_pages, "", total_freeable);
+ total_used_objs, total_pages, "", total_freeable,
+ pool->stats.pages_compacted);
return 0;
}
--
2.5.5
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