[PATCH] Kill PF_SYNCWRITE flag
A process flag to indicate whether we are doing sync io is incredibly
ugly. It also causes performance problems when one does a lot of async
io and then proceeds to sync it. Part of the io will go out as async,
and the other part as sync. This causes a disconnect between the
previously submitted io and the synced io. For io schedulers such as CFQ,
this will cause us lost merges and suboptimal behaviour in scheduling.
Remove PF_SYNCWRITE completely from the fsync/msync paths, and let
the O_DIRECT path just directly indicate that the writes are sync
by using WRITE_SYNC instead.
Signed-off-by: Jens Axboe <axboe@suse.de>
diff --git a/block/as-iosched.c b/block/as-iosched.c
index 9b13d72..56c99fa 100644
--- a/block/as-iosched.c
+++ b/block/as-iosched.c
@@ -1339,7 +1339,7 @@
arq->state = AS_RQ_NEW;
if (rq_data_dir(arq->request) == READ
- || current->flags&PF_SYNCWRITE)
+ || (arq->request->flags & REQ_RW_SYNC))
arq->is_sync = 1;
else
arq->is_sync = 0;
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index c88f161d..4c4e9cc 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -277,8 +277,6 @@
static void cfq_dispatch_insert(request_queue_t *, struct cfq_rq *);
static struct cfq_queue *cfq_get_queue(struct cfq_data *cfqd, unsigned int key, struct task_struct *tsk, gfp_t gfp_mask);
-#define process_sync(tsk) ((tsk)->flags & PF_SYNCWRITE)
-
/*
* lots of deadline iosched dupes, can be abstracted later...
*/
@@ -334,7 +332,7 @@
static inline pid_t cfq_queue_pid(struct task_struct *task, int rw)
{
- if (rw == READ || process_sync(task))
+ if (rw == READ || rw == WRITE_SYNC)
return task->pid;
return CFQ_KEY_ASYNC;
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 17c42dd..2270bb4 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -2827,6 +2827,9 @@
if (unlikely(bio_barrier(bio)))
req->flags |= (REQ_HARDBARRIER | REQ_NOMERGE);
+ if (bio_sync(bio))
+ req->flags |= REQ_RW_SYNC;
+
req->errors = 0;
req->hard_sector = req->sector = bio->bi_sector;
req->hard_nr_sectors = req->nr_sectors = bio_sectors(bio);
diff --git a/drivers/usb/gadget/file_storage.c b/drivers/usb/gadget/file_storage.c
index 6f88747..a43dc90 100644
--- a/drivers/usb/gadget/file_storage.c
+++ b/drivers/usb/gadget/file_storage.c
@@ -1906,7 +1906,6 @@
inode = filp->f_dentry->d_inode;
mutex_lock(&inode->i_mutex);
- current->flags |= PF_SYNCWRITE;
rc = filemap_fdatawrite(inode->i_mapping);
err = filp->f_op->fsync(filp, filp->f_dentry, 1);
if (!rc)
@@ -1914,7 +1913,6 @@
err = filemap_fdatawait(inode->i_mapping);
if (!rc)
rc = err;
- current->flags &= ~PF_SYNCWRITE;
mutex_unlock(&inode->i_mutex);
VLDBG(curlun, "fdatasync -> %d\n", rc);
return rc;
diff --git a/fs/buffer.c b/fs/buffer.c
index 23f1f3a..373bb62 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -331,7 +331,6 @@
goto out;
}
- current->flags |= PF_SYNCWRITE;
ret = filemap_fdatawrite(mapping);
/*
@@ -346,7 +345,6 @@
err = filemap_fdatawait(mapping);
if (!ret)
ret = err;
- current->flags &= ~PF_SYNCWRITE;
out:
return ret;
}
diff --git a/fs/direct-io.c b/fs/direct-io.c
index b05d1b2..538fb04 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -162,7 +162,7 @@
NULL); /* vmas */
up_read(¤t->mm->mmap_sem);
- if (ret < 0 && dio->blocks_available && (dio->rw == WRITE)) {
+ if (ret < 0 && dio->blocks_available && (dio->rw & WRITE)) {
struct page *page = ZERO_PAGE(dio->curr_user_address);
/*
* A memory fault, but the filesystem has some outstanding
@@ -535,7 +535,7 @@
map_bh->b_state = 0;
map_bh->b_size = fs_count << dio->inode->i_blkbits;
- create = dio->rw == WRITE;
+ create = dio->rw & WRITE;
if (dio->lock_type == DIO_LOCKING) {
if (dio->block_in_file < (i_size_read(dio->inode) >>
dio->blkbits))
@@ -867,7 +867,7 @@
loff_t i_size_aligned;
/* AKPM: eargh, -ENOTBLK is a hack */
- if (dio->rw == WRITE) {
+ if (dio->rw & WRITE) {
page_cache_release(page);
return -ENOTBLK;
}
@@ -1045,7 +1045,7 @@
}
} /* end iovec loop */
- if (ret == -ENOTBLK && rw == WRITE) {
+ if (ret == -ENOTBLK && (rw & WRITE)) {
/*
* The remaining part of the request will be
* be handled by buffered I/O when we return
@@ -1089,7 +1089,7 @@
if (dio->is_async) {
int should_wait = 0;
- if (dio->result < dio->size && rw == WRITE) {
+ if (dio->result < dio->size && (rw & WRITE)) {
dio->waiter = current;
should_wait = 1;
}
@@ -1142,7 +1142,7 @@
ret = transferred;
/* We could have also come here on an AIO file extend */
- if (!is_sync_kiocb(iocb) && rw == WRITE &&
+ if (!is_sync_kiocb(iocb) && (rw & WRITE) &&
ret >= 0 && dio->result == dio->size)
/*
* For AIO writes where we have completed the
@@ -1194,7 +1194,7 @@
int acquire_i_mutex = 0;
if (rw & WRITE)
- current->flags |= PF_SYNCWRITE;
+ rw = WRITE_SYNC;
if (bdev)
bdev_blkbits = blksize_bits(bdev_hardsect_size(bdev));
@@ -1270,7 +1270,7 @@
* even for AIO, we need to wait for i/o to complete before
* returning in this case.
*/
- dio->is_async = !is_sync_kiocb(iocb) && !((rw == WRITE) &&
+ dio->is_async = !is_sync_kiocb(iocb) && !((rw & WRITE) &&
(end > i_size_read(inode)));
retval = direct_io_worker(rw, iocb, inode, iov, offset,
@@ -1284,8 +1284,6 @@
mutex_unlock(&inode->i_mutex);
else if (acquire_i_mutex)
mutex_lock(&inode->i_mutex);
- if (rw & WRITE)
- current->flags &= ~PF_SYNCWRITE;
return retval;
}
EXPORT_SYMBOL(__blockdev_direct_IO);
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 6db95cf..031b27a 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -623,7 +623,6 @@
int need_write_inode_now = 0;
int err2;
- current->flags |= PF_SYNCWRITE;
if (what & OSYNC_DATA)
err = filemap_fdatawrite(mapping);
if (what & (OSYNC_METADATA|OSYNC_DATA)) {
@@ -636,7 +635,6 @@
if (!err)
err = err2;
}
- current->flags &= ~PF_SYNCWRITE;
spin_lock(&inode_lock);
if ((inode->i_state & I_DIRTY) &&
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 3457e7b..482a21d 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -241,6 +241,7 @@
__REQ_PM_RESUME, /* resume request */
__REQ_PM_SHUTDOWN, /* shutdown request */
__REQ_ORDERED_COLOR, /* is before or after barrier */
+ __REQ_RW_SYNC, /* request is sync (O_DIRECT) */
__REQ_NR_BITS, /* stops here */
};
@@ -270,6 +271,7 @@
#define REQ_PM_RESUME (1 << __REQ_PM_RESUME)
#define REQ_PM_SHUTDOWN (1 << __REQ_PM_SHUTDOWN)
#define REQ_ORDERED_COLOR (1 << __REQ_ORDERED_COLOR)
+#define REQ_RW_SYNC (1 << __REQ_RW_SYNC)
/*
* State information carried for REQ_PM_SUSPEND and REQ_PM_RESUME
diff --git a/include/linux/sched.h b/include/linux/sched.h
index a9d23c7..38b4791e 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -941,12 +941,11 @@
#define PF_KSWAPD 0x00040000 /* I am kswapd */
#define PF_SWAPOFF 0x00080000 /* I am in swapoff */
#define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
-#define PF_SYNCWRITE 0x00200000 /* I am doing a sync write */
-#define PF_BORROWED_MM 0x00400000 /* I am a kthread doing use_mm */
-#define PF_RANDOMIZE 0x00800000 /* randomize virtual address space */
-#define PF_SWAPWRITE 0x01000000 /* Allowed to write to swap */
-#define PF_SPREAD_PAGE 0x04000000 /* Spread page cache over cpuset */
-#define PF_SPREAD_SLAB 0x08000000 /* Spread some slab caches over cpuset */
+#define PF_BORROWED_MM 0x00200000 /* I am a kthread doing use_mm */
+#define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
+#define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
+#define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
+#define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
#define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
/*
diff --git a/mm/msync.c b/mm/msync.c
index bc6c953..d083544 100644
--- a/mm/msync.c
+++ b/mm/msync.c
@@ -170,8 +170,6 @@
* just ignore them, but return -ENOMEM at the end.
*/
down_read(¤t->mm->mmap_sem);
- if (flags & MS_SYNC)
- current->flags |= PF_SYNCWRITE;
vma = find_vma(current->mm, start);
if (!vma) {
error = -ENOMEM;
@@ -228,7 +226,6 @@
}
} while (vma && !done);
out_unlock:
- current->flags &= ~PF_SYNCWRITE;
up_read(¤t->mm->mmap_sem);
out:
return error;