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zram: introduce ZRAM_IDLE flag

Browse source 
To support idle page writeback with upcoming patches, this patch
introduces a new ZRAM_IDLE flag.

Userspace can mark zram slots as "idle" via
	"echo all > /sys/block/zramX/idle"
which marks every allocated zram slot as ZRAM_IDLE.
User could see it by /sys/kernel/debug/zram/zram0/block_state.

          300    75.033841 ...i
          301    63.806904 s..i
          302    63.806919 ..hi

Once there is IO for the slot, the mark will be disappeared.

	  300    75.033841 ...
          301    63.806904 s..i
          302    63.806919 ..hi

Therefore, 300th block is idle zpage. With this feature,
user can how many zram has idle pages which are waste of memory.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Minchan Kim <[email protected]>
Reviewed-by: Sergey Senozhatsky <[email protected]>
Reviewed-by: Joey Pabalinas <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Minchan Kim 2018-12-28 00:36:44 -08:00 • committed by Linus Torvalds
commit e82592c4fd
4 changed files with 69 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

57
drivers/block/zram/zram_drv.c
View file

@ -281,6 +281,47 @@ static ssize_t mem_used_max_store(struct device *dev,
return len;
}
static ssize_t idle_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
struct zram *zram = dev_to_zram(dev);
unsigned long nr_pages = zram->disksize >> PAGE_SHIFT;
int index;
char mode_buf[8];
ssize_t sz;
sz = strscpy(mode_buf, buf, sizeof(mode_buf));
if (sz <= 0)
return -EINVAL;
/* ignore trailing new line */
if (mode_buf[sz - 1] == '\n')
mode_buf[sz - 1] = 0x00;
if (strcmp(mode_buf, "all"))
return -EINVAL;
down_read(&zram->init_lock);
if (!init_done(zram)) {
up_read(&zram->init_lock);
return -EINVAL;
}
for (index = 0; index < nr_pages; index++) {
zram_slot_lock(zram, index);
if (!zram_allocated(zram, index))
goto next;
zram_set_flag(zram, index, ZRAM_IDLE);
next:
zram_slot_unlock(zram, index);
}
up_read(&zram->init_lock);
return len;
}
#ifdef CONFIG_ZRAM_WRITEBACK
static void reset_bdev(struct zram *zram)
{
@ -638,6 +679,7 @@ static void zram_debugfs_destroy(void)
static void zram_accessed(struct zram *zram, u32 index)
{
zram_clear_flag(zram, index, ZRAM_IDLE);
zram->table[index].ac_time = ktime_get_boottime();
}
@ -670,12 +712,13 @@ static ssize_t read_block_state(struct file *file, char __user *buf,
ts = ktime_to_timespec64(zram->table[index].ac_time);
copied = snprintf(kbuf + written, count,
"%12zd %12lld.%06lu %c%c%c\n",
"%12zd %12lld.%06lu %c%c%c%c\n",
index, (s64)ts.tv_sec,
ts.tv_nsec / NSEC_PER_USEC,
zram_test_flag(zram, index, ZRAM_SAME) ? 's' : '.',
zram_test_flag(zram, index, ZRAM_WB) ? 'w' : '.',
zram_test_flag(zram, index, ZRAM_HUGE) ? 'h' : '.');
zram_test_flag(zram, index, ZRAM_HUGE) ? 'h' : '.',
zram_test_flag(zram, index, ZRAM_IDLE) ? 'i' : '.');
if (count < copied) {
zram_slot_unlock(zram, index);
@ -720,7 +763,10 @@ static void zram_debugfs_unregister(struct zram *zram)
#else
static void zram_debugfs_create(void) {};
static void zram_debugfs_destroy(void) {};
static void zram_accessed(struct zram *zram, u32 index) {};
static void zram_accessed(struct zram *zram, u32 index)
{
zram_clear_flag(zram, index, ZRAM_IDLE);
};
static void zram_debugfs_register(struct zram *zram) {};
static void zram_debugfs_unregister(struct zram *zram) {};
#endif
@ -924,6 +970,9 @@ static void zram_free_page(struct zram *zram, size_t index)
#ifdef CONFIG_ZRAM_MEMORY_TRACKING
zram->table[index].ac_time = 0;
#endif
if (zram_test_flag(zram, index, ZRAM_IDLE))
zram_clear_flag(zram, index, ZRAM_IDLE);
if (zram_test_flag(zram, index, ZRAM_HUGE)) {
zram_clear_flag(zram, index, ZRAM_HUGE);
atomic64_dec(&zram->stats.huge_pages);
@ -1589,6 +1638,7 @@ static DEVICE_ATTR_RO(initstate);
static DEVICE_ATTR_WO(reset);
static DEVICE_ATTR_WO(mem_limit);
static DEVICE_ATTR_WO(mem_used_max);
static DEVICE_ATTR_WO(idle);
static DEVICE_ATTR_RW(max_comp_streams);
static DEVICE_ATTR_RW(comp_algorithm);
#ifdef CONFIG_ZRAM_WRITEBACK
@ -1602,6 +1652,7 @@ static struct attribute *zram_disk_attrs[] = {
&dev_attr_compact.attr,
&dev_attr_mem_limit.attr,
&dev_attr_mem_used_max.attr,
&dev_attr_idle.attr,
&dev_attr_max_comp_streams.attr,
&dev_attr_comp_algorithm.attr,
#ifdef CONFIG_ZRAM_WRITEBACK

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

@ -48,6 +48,7 @@ enum zram_pageflags {
ZRAM_SAME, /* Page consists the same element */
ZRAM_WB, /* page is stored on backing_device */
ZRAM_HUGE, /* Incompressible page */
ZRAM_IDLE, /* not accessed page since last idle marking */
__NR_ZRAM_PAGEFLAGS,
};