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zram: support compaction

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Now that zsmalloc supports compaction, zram can use it.  For the first
step, this patch exports compact knob via sysfs so user can do compaction
via "echo 1 > /sys/block/zram0/compact".

Signed-off-by: Minchan Kim <[email protected]>
Cc: Juneho Choi <[email protected]>
Cc: Gunho Lee <[email protected]>
Cc: Luigi Semenzato <[email protected]>
Cc: Dan Streetman <[email protected]>
Cc: Seth Jennings <[email protected]>
Cc: Nitin Gupta <[email protected]>
Cc: Jerome Marchand <[email protected]>
Cc: Sergey Senozhatsky <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Cc: Mel Gorman <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Minchan Kim 2015-04-15 16:15:36 -07:00 • committed by Linus Torvalds
commit 4e3ba87845
3 changed files with 41 additions and 0 deletions
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25
drivers/block/zram/zram_drv.c
View file

@ -63,6 +63,27 @@ static inline struct zram *dev_to_zram(struct device *dev)
return (struct zram *)dev_to_disk(dev)->private_data;
}
static ssize_t compact_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
unsigned long nr_migrated;
struct zram *zram = dev_to_zram(dev);
struct zram_meta *meta;
down_read(&zram->init_lock);
if (!init_done(zram)) {
up_read(&zram->init_lock);
return -EINVAL;
}
meta = zram->meta;
nr_migrated = zs_compact(meta->mem_pool);
atomic64_add(nr_migrated, &zram->stats.num_migrated);
up_read(&zram->init_lock);
return len;
}
static ssize_t disksize_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@ -1017,6 +1038,7 @@ static const struct block_device_operations zram_devops = {
.owner = THIS_MODULE
};
static DEVICE_ATTR_WO(compact);
static DEVICE_ATTR_RW(disksize);
static DEVICE_ATTR_RO(initstate);
static DEVICE_ATTR_WO(reset);
@ -1035,6 +1057,7 @@ ZRAM_ATTR_RO(invalid_io);
ZRAM_ATTR_RO(notify_free);
ZRAM_ATTR_RO(zero_pages);
ZRAM_ATTR_RO(compr_data_size);
ZRAM_ATTR_RO(num_migrated);
static struct attribute *zram_disk_attrs[] = {
&dev_attr_disksize.attr,
@ -1044,6 +1067,8 @@ static struct attribute *zram_disk_attrs[] = {
&dev_attr_num_writes.attr,
&dev_attr_failed_reads.attr,
&dev_attr_failed_writes.attr,
&dev_attr_num_migrated.attr,
&dev_attr_compact.attr,
&dev_attr_invalid_io.attr,
&dev_attr_notify_free.attr,
&dev_attr_zero_pages.attr,

1
drivers/block/zram/zram_drv.h
View file

@ -84,6 +84,7 @@ struct zram_stats {
atomic64_t compr_data_size; /* compressed size of pages stored */
atomic64_t num_reads; /* failed + successful */
atomic64_t num_writes; /* --do-- */
atomic64_t num_migrated; /* no. of migrated object */
atomic64_t failed_reads; /* can happen when memory is too low */
atomic64_t failed_writes; /* can happen when memory is too low */
atomic64_t invalid_io; /* non-page-aligned I/O requests */