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BACKPORT: zram: support compaction

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(cherry-pick from commit 4e3ba87845420e0bfa21e6c4f7f81897aed38f8c)

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".

Bug: 25951511

Change-Id: Id197e61879e41accb159f7b8ba037629eb4aa579
Signed-off-by: Minchan Kim <minchan@kernel.org>
Cc: Juneho Choi <juno.choi@lge.com>
Cc: Gunho Lee <gunho.lee@lge.com>
Cc: Luigi Semenzato <semenzato@google.com>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Seth Jennings <sjennings@variantweb.net>
Cc: Nitin Gupta <ngupta@vflare.org>
Cc: Jerome Marchand <jmarchan@redhat.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Minchan Kim 2015-04-15 16:15:36 -07:00 committed by Artem Borisov
parent 76c5023fc7
commit ee34c4e454
3 changed files with 41 additions and 0 deletions
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15
Documentation/ABI/testing/sysfs-block-zram
View file

@ -141,3 +141,18 @@ Description:
amount of memory ZRAM can use to store the compressed data. The
limit could be changed in run time and "0" means disable the
limit. No limit is the initial state. Unit: bytes
What: /sys/block/zram<id>/compact
Date: August 2015
Contact: Minchan Kim <minchan@kernel.org>
Description:
The compact file is write-only and trigger compaction for
allocator zrm uses. The allocator moves some objects so that
it could free fragment space.
What: /sys/block/zram<id>/num_migrated
Date: August 2015
Contact: Minchan Kim <minchan@kernel.org>
Description:
The compact file is read-only and shows how many object
migrated by compaction.

25
drivers/block/zram/zram_drv.c
View file

@ -64,6 +64,27 @@ 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)
{
@ -973,6 +994,7 @@ static const struct block_device_operations zram_devops = {
.owner = THIS_MODULE
};
static DEVICE_ATTR(compact, S_IWUSR, NULL, compact_store);
static DEVICE_ATTR(disksize, S_IRUGO | S_IWUSR,
disksize_show, disksize_store);
static DEVICE_ATTR(initstate, S_IRUGO, initstate_show, NULL);
@ -996,6 +1018,7 @@ 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,
@ -1005,6 +1028,8 @@ 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 */