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Message-ID: <1360557366.4204.8.camel@buesod1.americas.hpqcorp.net>
Date: Sun, 10 Feb 2013 20:36:06 -0800
From: Davidlohr Bueso <davidlohr.bueso@...com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-kernel@...r.kernel.org, Nitin Gupta <ngupta@...are.org>
Subject: [PATCH v2 2/2] zram: gather statistics in a unique file
Instead of having one sysfs file per zram statistic, group them all
in a single, reader-friendly, 'statistics' file. This not only reduces
code but is also makes it easier to visualize. The new file looks like:
Number of reads: 24
Number of writes: 1055
Invalid IO: 0
Notify free: 0
Zero pages: 1042
Orig data size: 49152 bytes
Compressed data: 838 bytes
Total memory used: 53248 bytes
Signed-off-by: Davidlohr Bueso <davidlohr.bueso@...com>
---
Documentation/ABI/testing/sysfs-block-zram | 85 +++++++---------------
drivers/staging/zram/zram.txt | 20 +-----
drivers/staging/zram/zram_sysfs.c | 109 ++++++-----------------------
3 files changed, 51 insertions(+), 163 deletions(-)
diff --git a/Documentation/ABI/testing/sysfs-block-zram b/Documentation/ABI/testing/sysfs-block-zram
index 4627c33..2328d29 100644
--- a/Documentation/ABI/testing/sysfs-block-zram
+++ b/Documentation/ABI/testing/sysfs-block-zram
@@ -21,70 +21,37 @@ Description:
device. The reset operation frees all the memory assocaited
with this device.
-What: /sys/block/zram<id>/num_reads
-Date: August 2010
-Contact: Nitin Gupta <ngupta@...are.org>
+What: /sys/block/zram<id>/statistics
+Date: February 2013
+Contact: Davidlohr Bueso <davidlohr.bueso@...com>
Description:
- The num_reads file is read-only and specifies the number of
- reads (failed or successful) done on this device.
+ The statistics file is read-only and shows different zram
+ related statistics:
+ - number of reads (failed or successful) done on this device.
-What: /sys/block/zram<id>/num_writes
-Date: August 2010
-Contact: Nitin Gupta <ngupta@...are.org>
-Description:
- The num_writes file is read-only and specifies the number of
- writes (failed or successful) done on this device.
+ - number of writes (failed or successful) done on this device.
-What: /sys/block/zram<id>/invalid_io
-Date: August 2010
-Contact: Nitin Gupta <ngupta@...are.org>
-Description:
- The invalid_io file is read-only and specifies the number of
- non-page-size-aligned I/O requests issued to this device.
+ - invalid IO: Number of non-page-size-aligned I/O requests
+ issued to this device.
-What: /sys/block/zram<id>/notify_free
-Date: August 2010
-Contact: Nitin Gupta <ngupta@...are.org>
-Description:
- The notify_free file is read-only and specifies the number of
- swap slot free notifications received by this device. These
- notifications are send to a swap block device when a swap slot
- is freed. This statistic is applicable only when this disk is
- being used as a swap disk.
+ - notify free: Number of swap slot free notifications received
+ by this device. These notifications are send to
+ a swap block device when a swap slot is freed.
+ This statistic is applicable only when this disk is
+ being used as a swap disk.
-What: /sys/block/zram<id>/zero_pages
-Date: August 2010
-Contact: Nitin Gupta <ngupta@...are.org>
-Description:
- The zero_pages file is read-only and specifies number of zero
- filled pages written to this disk. No memory is allocated for
- such pages.
+ - zero pages: Number of zero filled pages written to this disk.
+ No memory is allocated for such pages.
-What: /sys/block/zram<id>/orig_data_size
-Date: August 2010
-Contact: Nitin Gupta <ngupta@...are.org>
-Description:
- The orig_data_size file is read-only and specifies uncompressed
- size of data stored in this disk. This excludes zero-filled
- pages (zero_pages) since no memory is allocated for them.
- Unit: bytes
+ - Orig data size: The uncompressed size of data stored in this disk.
+ This excludes zero-filled pages (zero_pages)
+ since no memory is allocated for them.
-What: /sys/block/zram<id>/compr_data_size
-Date: August 2010
-Contact: Nitin Gupta <ngupta@...are.org>
-Description:
- The compr_data_size file is read-only and specifies compressed
- size of data stored in this disk. So, compression ratio can be
- calculated using orig_data_size and this statistic.
- Unit: bytes
+ - Compressed data: The compressed size of data stored in this disk.
+ Compression ratio can be calculated using orig
+ data size and this statistic.
-What: /sys/block/zram<id>/mem_used_total
-Date: August 2010
-Contact: Nitin Gupta <ngupta@...are.org>
-Description:
- The mem_used_total file is read-only and specifies the amount
- of memory, including allocator fragmentation and metadata
- overhead, allocated for this disk. So, allocator space
- efficiency can be calculated using compr_data_size and this
- statistic.
- Unit: bytes
+ - Total memory used: The amount of memory, including allocator fragmentation
+ and metadata overhead, allocated for this disk.
+ So, allocator space efficiency can be calculated using
+ compr_data_size and this statistic.
diff --git a/drivers/staging/zram/zram.txt b/drivers/staging/zram/zram.txt
index 765d790..b3111bc 100644
--- a/drivers/staging/zram/zram.txt
+++ b/drivers/staging/zram/zram.txt
@@ -12,7 +12,7 @@ good amounts of memory savings. Some of the usecases include /tmp storage,
use as swap disks, various caches under /var and maybe many more :)
Statistics for individual zram devices are exported through sysfs nodes at
-/sys/block/zram<id>/
+/sys/block/zram<id>/statistics
* Usage
@@ -42,25 +42,11 @@ Following shows a typical sequence of steps for using zram.
mkfs.ext4 /dev/zram1
mount /dev/zram1 /tmp
-4) Stats:
- Per-device statistics are exported as various nodes under
- /sys/block/zram<id>/
- disksize
- num_reads
- num_writes
- invalid_io
- notify_free
- discard
- zero_pages
- orig_data_size
- compr_data_size
- mem_used_total
-
-5) Deactivate:
+4) Deactivate:
swapoff /dev/zram0
umount /dev/zram1
-6) Reset:
+5) Reset:
Write any positive value to 'reset' sysfs node
echo 1 > /sys/block/zram0/reset
echo 1 > /sys/block/zram1/reset
diff --git a/drivers/staging/zram/zram_sysfs.c b/drivers/staging/zram/zram_sysfs.c
index e6a929d..2aac370 100644
--- a/drivers/staging/zram/zram_sysfs.c
+++ b/drivers/staging/zram/zram_sysfs.c
@@ -119,106 +119,41 @@ static ssize_t reset_store(struct device *dev,
return len;
}
-static ssize_t num_reads_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct zram *zram = dev_to_zram(dev);
-
- return sprintf(buf, "%llu\n",
- zram_stat64_read(zram, &zram->stats.num_reads));
-}
-
-static ssize_t num_writes_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct zram *zram = dev_to_zram(dev);
-
- return sprintf(buf, "%llu\n",
- zram_stat64_read(zram, &zram->stats.num_writes));
-}
-
-static ssize_t invalid_io_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct zram *zram = dev_to_zram(dev);
-
- return sprintf(buf, "%llu\n",
- zram_stat64_read(zram, &zram->stats.invalid_io));
-}
-
-static ssize_t notify_free_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct zram *zram = dev_to_zram(dev);
-
- return sprintf(buf, "%llu\n",
- zram_stat64_read(zram, &zram->stats.notify_free));
-}
-
-static ssize_t zero_pages_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct zram *zram = dev_to_zram(dev);
-
- return sprintf(buf, "%u\n", zram->stats.pages_zero);
-}
-
-static ssize_t orig_data_size_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct zram *zram = dev_to_zram(dev);
-
- return sprintf(buf, "%llu\n",
- (u64)(zram->stats.pages_stored) << PAGE_SHIFT);
-}
-
-static ssize_t compr_data_size_show(struct device *dev,
- struct device_attribute *attr, char *buf)
+static ssize_t statistics_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
{
struct zram *zram = dev_to_zram(dev);
-
- return sprintf(buf, "%llu\n",
- zram_stat64_read(zram, &zram->stats.compr_size));
-}
-
-static ssize_t mem_used_total_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- u64 val = 0;
- struct zram *zram = dev_to_zram(dev);
struct zram_meta *meta = zram->meta;
- if (zram->init_done)
- val = zs_get_total_size_bytes(meta->mem_pool);
-
- return sprintf(buf, "%llu\n", val);
+ return sprintf(buf,
+ "Number of reads:\t%llu\n"
+ "Number of writes:\t%llu\n"
+ "Invalid IO:\t\t%llu\n"
+ "Notify free:\t\t%llu\n"
+ "Zero pages:\t\t%u\n"
+ "Orig data size:\t\t%llu bytes\n"
+ "Compressed data:\t%llu bytes\n"
+ "Total memory used:\t%llu bytes\n",
+ zram_stat64_read(zram, &zram->stats.num_reads),
+ zram_stat64_read(zram, &zram->stats.num_writes),
+ zram_stat64_read(zram, &zram->stats.invalid_io),
+ zram_stat64_read(zram, &zram->stats.notify_free),
+ zram->stats.pages_zero,
+ (u64)(zram->stats.pages_stored) << PAGE_SHIFT,
+ zram_stat64_read(zram, &zram->stats.compr_size),
+ zram->init_done ? zs_get_total_size_bytes(meta->mem_pool) : 0);
}
-static DEVICE_ATTR(disksize, S_IRUGO | S_IWUSR,
- disksize_show, disksize_store);
+static DEVICE_ATTR(disksize, S_IRUGO | S_IWUSR, disksize_show, disksize_store);
static DEVICE_ATTR(initstate, S_IRUGO, initstate_show, NULL);
static DEVICE_ATTR(reset, S_IWUSR, NULL, reset_store);
-static DEVICE_ATTR(num_reads, S_IRUGO, num_reads_show, NULL);
-static DEVICE_ATTR(num_writes, S_IRUGO, num_writes_show, NULL);
-static DEVICE_ATTR(invalid_io, S_IRUGO, invalid_io_show, NULL);
-static DEVICE_ATTR(notify_free, S_IRUGO, notify_free_show, NULL);
-static DEVICE_ATTR(zero_pages, S_IRUGO, zero_pages_show, NULL);
-static DEVICE_ATTR(orig_data_size, S_IRUGO, orig_data_size_show, NULL);
-static DEVICE_ATTR(compr_data_size, S_IRUGO, compr_data_size_show, NULL);
-static DEVICE_ATTR(mem_used_total, S_IRUGO, mem_used_total_show, NULL);
+static DEVICE_ATTR(statistics, S_IRUGO, statistics_show, NULL);
static struct attribute *zram_disk_attrs[] = {
&dev_attr_disksize.attr,
&dev_attr_initstate.attr,
&dev_attr_reset.attr,
- &dev_attr_num_reads.attr,
- &dev_attr_num_writes.attr,
- &dev_attr_invalid_io.attr,
- &dev_attr_notify_free.attr,
- &dev_attr_zero_pages.attr,
- &dev_attr_orig_data_size.attr,
- &dev_attr_compr_data_size.attr,
- &dev_attr_mem_used_total.attr,
+ &dev_attr_statistics.attr,
NULL,
};
--
1.7.11.7
--
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