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Message-Id: <1215179928-9767-4-git-send-email-righi.andrea@gmail.com>
Date: Fri, 4 Jul 2008 15:58:48 +0200
From: Andrea Righi <righi.andrea@...il.com>
To: Balbir Singh <balbir@...ux.vnet.ibm.com>,
Paul Menage <menage@...gle.com>
Cc: Carl Henrik Lunde <chlunde@...g.uio.no>, axboe@...nel.dk,
matt@...ehost.com, roberto@...it.it, randy.dunlap@...cle.com,
Divyesh Shah <dpshah@...gle.com>, subrata@...ux.vnet.ibm.com,
eric.rannaud@...il.com, akpm@...ux-foundation.org,
containers@...ts.linux-foundation.org,
linux-kernel@...r.kernel.org, Andrea Righi <righi.andrea@...il.com>
Subject: [PATCH 3/3] i/o accounting and control
Apply the io-throttle controller to the opportune kernel functions. Both
accounting and throttling functionalities are performed by
cgroup_io_throttle().
Signed-off-by: Andrea Righi <righi.andrea@...il.com>
---
block/blk-core.c | 2 ++
fs/buffer.c | 10 ++++++++++
fs/direct-io.c | 3 +++
mm/page-writeback.c | 20 ++++++++++++++++++++
mm/readahead.c | 5 +++++
5 files changed, 40 insertions(+), 0 deletions(-)
diff --git a/block/blk-core.c b/block/blk-core.c
index 1905aab..2ac5463 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -26,6 +26,7 @@
#include <linux/swap.h>
#include <linux/writeback.h>
#include <linux/task_io_accounting_ops.h>
+#include <linux/blk-io-throttle.h>
#include <linux/interrupt.h>
#include <linux/cpu.h>
#include <linux/blktrace_api.h>
@@ -1482,6 +1483,7 @@ void submit_bio(int rw, struct bio *bio)
count_vm_events(PGPGOUT, count);
} else {
task_io_account_read(bio->bi_size);
+ cgroup_io_throttle(bio->bi_bdev, bio->bi_size, 1);
count_vm_events(PGPGIN, count);
}
diff --git a/fs/buffer.c b/fs/buffer.c
index 0f51c0f..6f41c3a 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -35,6 +35,7 @@
#include <linux/suspend.h>
#include <linux/buffer_head.h>
#include <linux/task_io_accounting_ops.h>
+#include <linux/blk-io-throttle.h>
#include <linux/bio.h>
#include <linux/notifier.h>
#include <linux/cpu.h>
@@ -700,6 +701,9 @@ EXPORT_SYMBOL(mark_buffer_dirty_inode);
static int __set_page_dirty(struct page *page,
struct address_space *mapping, int warn)
{
+ struct block_device *bdev = NULL;
+ size_t cgroup_io_acct = 0;
+
if (unlikely(!mapping))
return !TestSetPageDirty(page);
@@ -711,16 +715,22 @@ static int __set_page_dirty(struct page *page,
WARN_ON_ONCE(warn && !PageUptodate(page));
if (mapping_cap_account_dirty(mapping)) {
+ bdev = (mapping->host &&
+ mapping->host->i_sb->s_bdev) ?
+ mapping->host->i_sb->s_bdev : NULL;
+
__inc_zone_page_state(page, NR_FILE_DIRTY);
__inc_bdi_stat(mapping->backing_dev_info,
BDI_RECLAIMABLE);
task_io_account_write(PAGE_CACHE_SIZE);
+ cgroup_io_acct = PAGE_CACHE_SIZE;
}
radix_tree_tag_set(&mapping->page_tree,
page_index(page), PAGECACHE_TAG_DIRTY);
}
write_unlock_irq(&mapping->tree_lock);
__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
+ cgroup_io_throttle(bdev, cgroup_io_acct, 0);
return 1;
}
diff --git a/fs/direct-io.c b/fs/direct-io.c
index 9e81add..42c8e54 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -35,6 +35,7 @@
#include <linux/buffer_head.h>
#include <linux/rwsem.h>
#include <linux/uio.h>
+#include <linux/blk-io-throttle.h>
#include <asm/atomic.h>
/*
@@ -666,6 +667,8 @@ submit_page_section(struct dio *dio, struct page *page,
/*
* Read accounting is performed in submit_bio()
*/
+ struct block_device *bdev = dio->bio ? dio->bio->bi_bdev : NULL;
+ cgroup_io_throttle(bdev, len, 1);
task_io_account_write(len);
}
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 789b6ad..8e5e99d 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -23,6 +23,7 @@
#include <linux/init.h>
#include <linux/backing-dev.h>
#include <linux/task_io_accounting_ops.h>
+#include <linux/blk-io-throttle.h>
#include <linux/blkdev.h>
#include <linux/mpage.h>
#include <linux/rmap.h>
@@ -430,6 +431,9 @@ static void balance_dirty_pages(struct address_space *mapping)
unsigned long write_chunk = sync_writeback_pages();
struct backing_dev_info *bdi = mapping->backing_dev_info;
+ struct block_device *bdev = (mapping->host &&
+ mapping->host->i_sb->s_bdev) ?
+ mapping->host->i_sb->s_bdev : NULL;
for (;;) {
struct writeback_control wbc = {
@@ -512,6 +516,14 @@ static void balance_dirty_pages(struct address_space *mapping)
return; /* pdflush is already working this queue */
/*
+ * Apply the cgroup i/o throttling limitations. The accounting of write
+ * activity in page cache is performed in __set_page_dirty(), but since
+ * we cannot sleep there, 0 bytes are accounted here and the function
+ * is invoked only for throttling purpose.
+ */
+ cgroup_io_throttle(bdev, 0, 1);
+
+ /*
* In laptop mode, we wait until hitting the higher threshold before
* starting background writeout, and then write out all the way down
* to the lower threshold. So slow writers cause minimal disk activity.
@@ -1077,6 +1089,8 @@ int __set_page_dirty_nobuffers(struct page *page)
if (!TestSetPageDirty(page)) {
struct address_space *mapping = page_mapping(page);
struct address_space *mapping2;
+ struct block_device *bdev = NULL;
+ size_t cgroup_io_acct = 0;
if (!mapping)
return 1;
@@ -1087,10 +1101,15 @@ int __set_page_dirty_nobuffers(struct page *page)
BUG_ON(mapping2 != mapping);
WARN_ON_ONCE(!PagePrivate(page) && !PageUptodate(page));
if (mapping_cap_account_dirty(mapping)) {
+ bdev = (mapping->host &&
+ mapping->host->i_sb->s_bdev) ?
+ mapping->host->i_sb->s_bdev : NULL;
+
__inc_zone_page_state(page, NR_FILE_DIRTY);
__inc_bdi_stat(mapping->backing_dev_info,
BDI_RECLAIMABLE);
task_io_account_write(PAGE_CACHE_SIZE);
+ cgroup_io_acct = PAGE_CACHE_SIZE;
}
radix_tree_tag_set(&mapping->page_tree,
page_index(page), PAGECACHE_TAG_DIRTY);
@@ -1100,6 +1119,7 @@ int __set_page_dirty_nobuffers(struct page *page)
/* !PageAnon && !swapper_space */
__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
}
+ cgroup_io_throttle(bdev, cgroup_io_acct, 1);
return 1;
}
return 0;
diff --git a/mm/readahead.c b/mm/readahead.c
index d8723a5..ec83e63 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -14,6 +14,7 @@
#include <linux/blkdev.h>
#include <linux/backing-dev.h>
#include <linux/task_io_accounting_ops.h>
+#include <linux/blk-io-throttle.h>
#include <linux/pagevec.h>
#include <linux/pagemap.h>
@@ -58,6 +59,9 @@ int read_cache_pages(struct address_space *mapping, struct list_head *pages,
int (*filler)(void *, struct page *), void *data)
{
struct page *page;
+ struct block_device *bdev =
+ (mapping->host && mapping->host->i_sb->s_bdev) ?
+ mapping->host->i_sb->s_bdev : NULL;
int ret = 0;
while (!list_empty(pages)) {
@@ -76,6 +80,7 @@ int read_cache_pages(struct address_space *mapping, struct list_head *pages,
break;
}
task_io_account_read(PAGE_CACHE_SIZE);
+ cgroup_io_throttle(bdev, PAGE_CACHE_SIZE, 1);
}
return ret;
}
--
1.5.4.3
--
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