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Message-id: <001201cfb838$fb0ac4a0$f1204de0$@samsung.com>
Date: Fri, 15 Aug 2014 11:27:04 +0800
From: Chao Yu <chao2.yu@...sung.com>
To: minchan@...nel.org
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
ngupta@...are.org, 'Jerome Marchand' <jmarchan@...hat.com>,
'Sergey Senozhatsky' <sergey.senozhatsky@...il.com>,
'Andrew Morton' <akpm@...ux-foundation.org>
Subject: [PATCH] zram: add num_discards for discarded pages stat
Now we have supported handling discard request which is sended by filesystem,
but no interface could be used to show information of discard.
This patch adds num_discards to stat discarded pages, then export it to sysfs
for displaying.
Signed-off-by: Chao Yu <chao2.yu@...sung.com>
---
Documentation/ABI/testing/sysfs-block-zram | 10 ++++++++++
drivers/block/zram/zram_drv.c | 3 +++
drivers/block/zram/zram_drv.h | 1 +
3 files changed, 14 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-block-zram b/Documentation/ABI/testing/sysfs-block-zram
index 70ec992..fa8936e 100644
--- a/Documentation/ABI/testing/sysfs-block-zram
+++ b/Documentation/ABI/testing/sysfs-block-zram
@@ -57,6 +57,16 @@ Description:
The failed_writes file is read-only and specifies the number of
failed writes happened on this device.
+
+What: /sys/block/zram<id>/num_discards
+Date: August 2014
+Contact: Chao Yu <chao2.yu@...sung.com>
+Description:
+ The num_discards file is read-only and specifies the number of
+ physical blocks which are discarded by this device. These blocks
+ are included in discard request which is sended by filesystem as
+ the blocks are no longer used.
+
What: /sys/block/zram<id>/max_comp_streams
Date: February 2014
Contact: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index d00831c..904e7a5 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -606,6 +606,7 @@ static void zram_bio_discard(struct zram *zram, u32 index,
bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
zram_free_page(zram, index);
bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+ atomic64_inc(&zram->stats.num_discards);
index++;
n -= PAGE_SIZE;
}
@@ -866,6 +867,7 @@ ZRAM_ATTR_RO(num_reads);
ZRAM_ATTR_RO(num_writes);
ZRAM_ATTR_RO(failed_reads);
ZRAM_ATTR_RO(failed_writes);
+ZRAM_ATTR_RO(num_discards);
ZRAM_ATTR_RO(invalid_io);
ZRAM_ATTR_RO(notify_free);
ZRAM_ATTR_RO(zero_pages);
@@ -879,6 +881,7 @@ static struct attribute *zram_disk_attrs[] = {
&dev_attr_num_writes.attr,
&dev_attr_failed_reads.attr,
&dev_attr_failed_writes.attr,
+ &dev_attr_num_discards.attr,
&dev_attr_invalid_io.attr,
&dev_attr_notify_free.attr,
&dev_attr_zero_pages.attr,
diff --git a/drivers/block/zram/zram_drv.h b/drivers/block/zram/zram_drv.h
index e0f725c..2994aaf 100644
--- a/drivers/block/zram/zram_drv.h
+++ b/drivers/block/zram/zram_drv.h
@@ -86,6 +86,7 @@ struct zram_stats {
atomic64_t num_writes; /* --do-- */
atomic64_t failed_reads; /* can happen when memory is too low */
atomic64_t failed_writes; /* can happen when memory is too low */
+ atomic64_t num_discards; /* no. of discarded pages */
atomic64_t invalid_io; /* non-page-aligned I/O requests */
atomic64_t notify_free; /* no. of swap slot free notifications */
atomic64_t zero_pages; /* no. of zero filled pages */
--
2.0.1.474.g72c7794
--
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