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authorJens Axboe <axboe@suse.de>2006-06-13 08:26:10 +0200
committerJens Axboe <axboe@nelson.home.kernel.dk>2006-06-23 17:10:39 +0200
commitb31dc66a54ad986b6b73bdc49c8efc17cbad1833 (patch)
tree5591383c1cbffe11512da889c971f899333f1a44 /drivers/usb
parent271f18f102c789f59644bb6c53a69da1df72b2f4 (diff)
downloadblackbird-op-linux-b31dc66a54ad986b6b73bdc49c8efc17cbad1833.tar.gz
blackbird-op-linux-b31dc66a54ad986b6b73bdc49c8efc17cbad1833.zip
[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>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/gadget/file_storage.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/drivers/usb/gadget/file_storage.c b/drivers/usb/gadget/file_storage.c
index 6f887478b148..a43dc908ac59 100644
--- a/drivers/usb/gadget/file_storage.c
+++ b/drivers/usb/gadget/file_storage.c
@@ -1906,7 +1906,6 @@ static int fsync_sub(struct lun *curlun)
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 @@ static int fsync_sub(struct lun *curlun)
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;
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