From: Sergey Senozhatsky <sergey.senozhat...@gmail.com>
allocate new `zram_meta' in disksize_store() only for uninitialised
zram device, saving a number of allocations and deallocations in case
if disksize_store() was called on currently used device. at the same
time zram_meta stack variable is not necessary, because we can set
->meta directly. there is also no need in setting QUEUE_FLAG_NONROT
queue on every disksize_store(), set it once during device creation.
[minc...@kernel.org]: handled zram->meta alloc fail case.
Signed-off-by: Sergey Senozhatsky <sergey.senozhat...@gmail.com>
Signed-off-by: Minchan Kim <minc...@kernel.org>
---
drivers/block/zram/zram_drv.c | 25 +++++++++----------------
1 file changed, 9 insertions(+), 16 deletions(-)
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 21aee3edcb25..9baac5b76bfe 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -533,40 +533,32 @@ static void zram_reset_device(struct zram *zram, bool
reset_capacity)
up_write(&zram->init_lock);
}
-static void zram_init_device(struct zram *zram, struct zram_meta *meta)
-{
- /* zram devices sort of resembles non-rotational disks */
- queue_flag_set_unlocked(QUEUE_FLAG_NONROT, zram->disk->queue);
- zram->meta = meta;
- pr_debug("Initialization done!\n");
-}
-
static ssize_t disksize_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
u64 disksize;
- struct zram_meta *meta;
struct zram *zram = dev_to_zram(dev);
disksize = memparse(buf, NULL);
if (!disksize)
return -EINVAL;
- disksize = PAGE_ALIGN(disksize);
- meta = zram_meta_alloc(disksize);
- if (!meta)
- return -ENOMEM;
down_write(&zram->init_lock);
if (init_done(zram)) {
up_write(&zram->init_lock);
- zram_meta_free(meta);
pr_info("Cannot change disksize for initialized device\n");
return -EBUSY;
}
+ disksize = PAGE_ALIGN(disksize);
+ zram->meta = zram_meta_alloc(disksize);
+ if (!zram->meta) {
+ up_write(&zram->init_lock);
+ return -ENOMEM;
+ }
+
zram->disksize = disksize;
set_capacity(zram->disk, zram->disksize >> SECTOR_SHIFT);
- zram_init_device(zram, meta);
up_write(&zram->init_lock);
return len;
@@ -776,7 +768,8 @@ static int create_device(struct zram *zram, int device_id)
/* Actual capacity set using syfs (/sys/block/zram<id>/disksize */
set_capacity(zram->disk, 0);
-
+ /* zram devices sort of resembles non-rotational disks */
+ queue_flag_set_unlocked(QUEUE_FLAG_NONROT, zram->disk->queue);
/*
* To ensure that we always get PAGE_SIZE aligned
* and n*PAGE_SIZED sized I/O requests.
--
1.8.5.3
--
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