lkml.org 
[lkml]   [2008]   [Oct]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH -mm 5/6] i/o controller instrumentation: accounting and throttling
Date
Apply the cgroup-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@gmail.com>
---
block/blk-core.c | 4 ++++
fs/aio.c | 12 ++++++++++++
fs/direct-io.c | 3 +++
include/linux/sched.h | 7 +++++++
kernel/fork.c | 8 +++++++-
mm/page-writeback.c | 4 ++++
mm/readahead.c | 3 +++
7 files changed, 40 insertions(+), 1 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index 6cb3c6d..cc8a493 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/blktrace_api.h>
#include <linux/fault-inject.h>

@@ -1504,9 +1505,12 @@ void submit_bio(int rw, struct bio *bio)
if (bio_has_data(bio)) {
if (rw & WRITE) {
count_vm_events(PGPGOUT, count);
+ cgroup_io_throttle(bio_iovec_idx(bio, 0)->bv_page,
+ bio->bi_bdev, bio->bi_size, 0);
} else {
task_io_account_read(bio->bi_size);
count_vm_events(PGPGIN, count);
+ cgroup_io_throttle(NULL, bio->bi_bdev, bio->bi_size, 1);
}

if (unlikely(block_dump)) {
diff --git a/fs/aio.c b/fs/aio.c
index f658441..ee8d452 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -22,6 +22,7 @@
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/file.h>
+#include <linux/blk-io-throttle.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/slab.h>
@@ -1558,6 +1559,7 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
{
struct kiocb *req;
struct file *file;
+ struct block_device *bdev;
ssize_t ret;

/* enforce forwards compatibility on users */
@@ -1580,6 +1582,14 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
if (unlikely(!file))
return -EBADF;

+ /* check if we're exceeding the IO throttling limits */
+ bdev = as_to_bdev(file->f_mapping);
+ ret = cgroup_io_throttle(NULL, bdev, 0, 0);
+ if (unlikely(ret)) {
+ fput(file);
+ return -EAGAIN;
+ }
+
req = aio_get_req(ctx); /* returns with 2 references to req */
if (unlikely(!req)) {
fput(file);
@@ -1622,12 +1632,14 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
goto out_put_req;

spin_lock_irq(&ctx->ctx_lock);
+ set_in_aio();
aio_run_iocb(req);
if (!list_empty(&ctx->run_list)) {
/* drain the run list */
while (__aio_run_iocbs(ctx))
;
}
+ unset_in_aio();
spin_unlock_irq(&ctx->ctx_lock);
aio_put_req(req); /* drop extra ref to req */
return 0;
diff --git a/fs/direct-io.c b/fs/direct-io.c
index 9606ee8..66f011a 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -28,6 +28,7 @@
#include <linux/highmem.h>
#include <linux/pagemap.h>
#include <linux/task_io_accounting_ops.h>
+#include <linux/blk-io-throttle.h>
#include <linux/bio.h>
#include <linux/wait.h>
#include <linux/err.h>
@@ -657,10 +658,12 @@ submit_page_section(struct dio *dio, struct page *page,
int ret = 0;

if (dio->rw & WRITE) {
+ struct block_device *bdev = dio->inode->i_sb->s_bdev;
/*
* Read accounting is performed in submit_bio()
*/
task_io_account_write(len);
+ cgroup_io_throttle(NULL, bdev, 0, 1);
}

/*
diff --git a/include/linux/sched.h b/include/linux/sched.h
index cd67fac..685c449 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1210,6 +1210,13 @@ struct task_struct {
unsigned long ptrace_message;
siginfo_t *last_siginfo; /* For ptrace use. */
struct task_io_accounting ioac;
+#ifdef CONFIG_CGROUP_IO_THROTTLE
+ atomic_t in_aio;
+ unsigned long long io_throttle_bw_cnt;
+ unsigned long long io_throttle_bw_sleep;
+ unsigned long long io_throttle_iops_cnt;
+ unsigned long long io_throttle_iops_sleep;
+#endif
#if defined(CONFIG_TASK_XACCT)
u64 acct_rss_mem1; /* accumulated rss usage */
u64 acct_vm_mem1; /* accumulated virtual memory usage */
diff --git a/kernel/fork.c b/kernel/fork.c
index 7b34bc5..99cef1a 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1004,7 +1004,13 @@ static struct task_struct *copy_process(unsigned long clone_flags,

task_io_accounting_init(&p->ioac);
acct_clear_integrals(p);
-
+#ifdef CONFIG_CGROUP_IO_THROTTLE
+ atomic_set(&p->in_aio, 0);
+ p->io_throttle_bw_cnt = 0;
+ p->io_throttle_bw_sleep = 0;
+ p->io_throttle_iops_cnt = 0;
+ p->io_throttle_iops_sleep = 0;
+#endif
p->it_virt_expires = cputime_zero;
p->it_prof_expires = cputime_zero;
p->it_sched_expires = 0;
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index c6d6088..7096b26 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>
@@ -556,6 +557,9 @@ void balance_dirty_pages_ratelimited_nr(struct address_space *mapping,
static DEFINE_PER_CPU(unsigned long, ratelimits) = 0;
unsigned long ratelimit;
unsigned long *p;
+ struct block_device *bdev = as_to_bdev(mapping);
+
+ cgroup_io_throttle(NULL, bdev, 0, 1);

ratelimit = ratelimit_pages;
if (mapping->backing_dev_info->dirty_exceeded)
diff --git a/mm/readahead.c b/mm/readahead.c
index 137bc56..176ad00 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 +59,7 @@ 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 = as_to_bdev(mapping);
int ret = 0;

while (!list_empty(pages)) {
@@ -76,6 +78,7 @@ int read_cache_pages(struct address_space *mapping, struct list_head *pages,
break;
}
task_io_account_read(PAGE_CACHE_SIZE);
+ cgroup_io_throttle(NULL, bdev, PAGE_CACHE_SIZE, 1);
}
return ret;
}
--
1.5.4.3


\
 
 \ /
  Last update: 2008-10-07 12:09    [W:0.050 / U:2.004 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site