From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-f170.google.com (mail-pd0-f170.google.com [209.85.192.170]) by kanga.kvack.org (Postfix) with ESMTP id C5D606B0035 for ; Tue, 19 Aug 2014 06:35:38 -0400 (EDT) Received: by mail-pd0-f170.google.com with SMTP id g10so9462315pdj.29 for ; Tue, 19 Aug 2014 03:35:37 -0700 (PDT) Received: from mailout1.samsung.com (mailout1.samsung.com. [203.254.224.24]) by mx.google.com with ESMTPS id hn4si2634359pdb.66.2014.08.19.03.35.33 for (version=TLSv1 cipher=RC4-MD5 bits=128/128); Tue, 19 Aug 2014 03:35:34 -0700 (PDT) Received: from epcpsbgm2.samsung.com (epcpsbgm2 [203.254.230.27]) by mailout1.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0NAJ00IH3UR398A0@mailout1.samsung.com> for linux-mm@kvack.org; Tue, 19 Aug 2014 19:35:27 +0900 (KST) From: Chao Yu Subject: [PATCH v2] zram: add num_discards for discarded pages stat Date: Tue, 19 Aug 2014 18:34:30 +0800 Message-id: <003501cfbb99$4abe9c70$e03bd550$@samsung.com> MIME-version: 1.0 Content-type: text/plain; charset=US-ASCII Content-transfer-encoding: 7bit Content-language: zh-cn Sender: owner-linux-mm@kvack.org List-ID: To: minchan@kernel.org Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, ngupta@vflare.org, 'Jerome Marchand' , 'Sergey Senozhatsky' , 'Andrew Morton' 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. v2: update zram document. Signed-off-by: Chao Yu --- Documentation/ABI/testing/sysfs-block-zram | 10 ++++++++++ Documentation/blockdev/zram.txt | 1 + drivers/block/zram/zram_drv.c | 3 +++ drivers/block/zram/zram_drv.h | 1 + 4 files changed, 15 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/num_discards +Date: August 2014 +Contact: Chao Yu +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/max_comp_streams Date: February 2014 Contact: Sergey Senozhatsky diff --git a/Documentation/blockdev/zram.txt b/Documentation/blockdev/zram.txt index 0595c3f..e50e18b 100644 --- a/Documentation/blockdev/zram.txt +++ b/Documentation/blockdev/zram.txt @@ -89,6 +89,7 @@ size of the disk when not in use so a huge zram is wasteful. num_writes failed_reads failed_writes + num_discards invalid_io notify_free zero_pages 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org