Subject: + zram-use-zcomp-compressing-backends.patch added to -mm tree
To: sergey.senozhatsky@xxxxxxxxx,jmarchan@xxxxxxxxxx,minchan@xxxxxxxxxx,ngupta@xxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Fri, 28 Feb 2014 15:52:36 -0800
The patch titled
Subject: zram: use zcomp compressing backends
has been added to the -mm tree. Its filename is
zram-use-zcomp-compressing-backends.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/zram-use-zcomp-compressing-backends.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/zram-use-zcomp-compressing-backends.patch
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------------------------------------------------------
From: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
Subject: zram: use zcomp compressing backends
Do not perform direct LZO compress/decompress calls, initialise
and use zcomp LZO backend (single compression stream) instead.
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Jerome Marchand <jmarchan@xxxxxxxxxx>
Cc: Nitin Gupta <ngupta@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/block/zram/Makefile | 2 -
drivers/block/zram/zram_drv.c | 59 +++++++++++++-------------------
drivers/block/zram/zram_drv.h | 8 ++--
3 files changed, 29 insertions(+), 40 deletions(-)
diff -puN drivers/block/zram/Makefile~zram-use-zcomp-compressing-backends drivers/block/zram/Makefile
--- a/drivers/block/zram/Makefile~zram-use-zcomp-compressing-backends
+++ a/drivers/block/zram/Makefile
@@ -1,3 +1,3 @@
-zram-y := zram_drv.o
+zram-y := zcomp_lzo.o zcomp.o zram_drv.o
obj-$(CONFIG_ZRAM) += zram.o
diff -puN drivers/block/zram/zram_drv.c~zram-use-zcomp-compressing-backends drivers/block/zram/zram_drv.c
--- a/drivers/block/zram/zram_drv.c~zram-use-zcomp-compressing-backends
+++ a/drivers/block/zram/zram_drv.c
@@ -29,7 +29,6 @@
#include <linux/genhd.h>
#include <linux/highmem.h>
#include <linux/slab.h>
-#include <linux/lzo.h>
#include <linux/string.h>
#include <linux/vmalloc.h>
@@ -38,6 +37,7 @@
/* Globals */
static int zram_major;
static struct zram *zram_devices;
+static const char *default_compressor = "lzo";
/* Module params (documentation at end) */
static unsigned int num_devices = 1;
@@ -160,8 +160,6 @@ static inline int valid_io_request(struc
static void zram_meta_free(struct zram_meta *meta)
{
zs_destroy_pool(meta->mem_pool);
- kfree(meta->compress_workmem);
- free_pages((unsigned long)meta->compress_buffer, 1);
vfree(meta->table);
kfree(meta);
}
@@ -173,22 +171,11 @@ static struct zram_meta *zram_meta_alloc
if (!meta)
goto out;
- meta->compress_workmem = kzalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
- if (!meta->compress_workmem)
- goto free_meta;
-
- meta->compress_buffer =
- (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 1);
- if (!meta->compress_buffer) {
- pr_err("Error allocating compressor buffer space\n");
- goto free_workmem;
- }
-
num_pages = disksize >> PAGE_SHIFT;
meta->table = vzalloc(num_pages * sizeof(*meta->table));
if (!meta->table) {
pr_err("Error allocating zram address table\n");
- goto free_buffer;
+ goto free_meta;
}
meta->mem_pool = zs_create_pool(GFP_NOIO | __GFP_HIGHMEM);
@@ -198,15 +185,10 @@ static struct zram_meta *zram_meta_alloc
}
rwlock_init(&meta->tb_lock);
- mutex_init(&meta->buffer_lock);
return meta;
free_table:
vfree(meta->table);
-free_buffer:
- free_pages((unsigned long)meta->compress_buffer, 1);
-free_workmem:
- kfree(meta->compress_workmem);
free_meta:
kfree(meta);
meta = NULL;
@@ -280,8 +262,7 @@ static void zram_free_page(struct zram *
static int zram_decompress_page(struct zram *zram, char *mem, u32 index)
{
- int ret = LZO_E_OK;
- size_t clen = PAGE_SIZE;
+ int ret = 0;
unsigned char *cmem;
struct zram_meta *meta = zram->meta;
unsigned long handle;
@@ -301,12 +282,12 @@ static int zram_decompress_page(struct z
if (size == PAGE_SIZE)
copy_page(mem, cmem);
else
- ret = lzo1x_decompress_safe(cmem, size, mem, &clen);
+ ret = zcomp_decompress(zram->comp, cmem, size, mem);
zs_unmap_object(meta->mem_pool, handle);
read_unlock(&meta->tb_lock);
/* Should NEVER happen. Return bio error if it does. */
- if (unlikely(ret != LZO_E_OK)) {
+ if (unlikely(ret)) {
pr_err("Decompression failed! err=%d, page=%u\n", ret, index);
atomic64_inc(&zram->stats.failed_reads);
return ret;
@@ -349,7 +330,7 @@ static int zram_bvec_read(struct zram *z
ret = zram_decompress_page(zram, uncmem, index);
/* Should NEVER happen. Return bio error if it does. */
- if (unlikely(ret != LZO_E_OK))
+ if (unlikely(ret))
goto out_cleanup;
if (is_partial_io(bvec))
@@ -374,11 +355,10 @@ static int zram_bvec_write(struct zram *
struct page *page;
unsigned char *user_mem, *cmem, *src, *uncmem = NULL;
struct zram_meta *meta = zram->meta;
+ struct zcomp_strm *zstrm;
bool locked = false;
page = bvec->bv_page;
- src = meta->compress_buffer;
-
if (is_partial_io(bvec)) {
/*
* This is a partial IO. We need to read the full page
@@ -394,7 +374,7 @@ static int zram_bvec_write(struct zram *
goto out;
}
- mutex_lock(&meta->buffer_lock);
+ zstrm = zcomp_strm_find(zram->comp);
locked = true;
user_mem = kmap_atomic(page);
@@ -420,22 +400,20 @@ static int zram_bvec_write(struct zram *
goto out;
}
- ret = lzo1x_1_compress(uncmem, PAGE_SIZE, src, &clen,
- meta->compress_workmem);
+ ret = zcomp_compress(zram->comp, zstrm, uncmem, &clen);
if (!is_partial_io(bvec)) {
kunmap_atomic(user_mem);
user_mem = NULL;
uncmem = NULL;
}
- if (unlikely(ret != LZO_E_OK)) {
+ if (unlikely(ret)) {
pr_err("Compression failed! err=%d\n", ret);
goto out;
}
-
+ src = zstrm->buffer;
if (unlikely(clen > max_zpage_size)) {
clen = PAGE_SIZE;
- src = NULL;
if (is_partial_io(bvec))
src = uncmem;
}
@@ -457,6 +435,8 @@ static int zram_bvec_write(struct zram *
memcpy(cmem, src, clen);
}
+ zcomp_strm_release(zram->comp, zstrm);
+ locked = false;
zs_unmap_object(meta->mem_pool, handle);
/*
@@ -475,10 +455,9 @@ static int zram_bvec_write(struct zram *
atomic64_inc(&zram->stats.pages_stored);
out:
if (locked)
- mutex_unlock(&meta->buffer_lock);
+ zcomp_strm_release(zram->comp, zstrm);
if (is_partial_io(bvec))
kfree(uncmem);
-
if (ret)
atomic64_inc(&zram->stats.failed_writes);
return ret;
@@ -522,6 +501,7 @@ static void zram_reset_device(struct zra
zs_free(meta->mem_pool, handle);
}
+ zcomp_destroy(zram->comp);
zram_meta_free(zram->meta);
zram->meta = NULL;
/* Reset stats */
@@ -550,9 +530,18 @@ static ssize_t disksize_store(struct dev
return -EBUSY;
}
+ zram->comp = zcomp_create(default_compressor);
+ if (!zram->comp) {
+ up_write(&zram->init_lock);
+ pr_info("Cannot initialise %s compressing backend\n",
+ default_compressor);
+ return -EINVAL;
+ }
+
disksize = PAGE_ALIGN(disksize);
zram->meta = zram_meta_alloc(disksize);
if (!zram->meta) {
+ zcomp_destroy(zram->comp);
up_write(&zram->init_lock);
return -ENOMEM;
}
diff -puN drivers/block/zram/zram_drv.h~zram-use-zcomp-compressing-backends drivers/block/zram/zram_drv.h
--- a/drivers/block/zram/zram_drv.h~zram-use-zcomp-compressing-backends
+++ a/drivers/block/zram/zram_drv.h
@@ -16,9 +16,10 @@
#define _ZRAM_DRV_H_
#include <linux/spinlock.h>
-#include <linux/mutex.h>
#include <linux/zsmalloc.h>
+#include "zcomp.h"
+
/*
* Some arbitrary value. This is just to catch
* invalid value for num_devices module parameter.
@@ -81,17 +82,16 @@ struct zram_stats {
struct zram_meta {
rwlock_t tb_lock; /* protect table */
- void *compress_workmem;
- void *compress_buffer;
struct table *table;
struct zs_pool *mem_pool;
- struct mutex buffer_lock; /* protect compress buffers */
};
struct zram {
struct zram_meta *meta;
struct request_queue *queue;
struct gendisk *disk;
+ struct zcomp *comp;
+
/* Prevent concurrent execution of device init, reset and R/W request */
struct rw_semaphore init_lock;
/*
_
Patches currently in -mm which might be from sergey.senozhatsky@xxxxxxxxx are
zram-drop-init_done-struct-zram-member.patch
zram-do-not-pass-rw-argument-to-__zram_make_request.patch
zram-remove-good-and-bad-compress-stats.patch
zram-use-atomic64_t-for-all-zram-stats.patch
zram-remove-zram-stats-code-duplication.patch
zram-report-failed-read-and-write-stats.patch
zram-drop-not-used-table-count-member.patch
zram-move-zram-size-warning-to-documentation.patch
zram-document-failed_reads-failed_writes-stats.patch
zram-delete-zram_init_device.patch
zram-introduce-compressing-backend-abstraction.patch
zram-use-zcomp-compressing-backends.patch
zram-factor-out-single-stream-compression.patch
zram-add-multi-stream-functionality.patch
zram-add-set_max_streams-knob.patch
zram-make-compression-algorithm-selection-possible.patch
zram-add-lz4-algorithm-backend.patch
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