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[PATCH] Kill PF_SYNCWRITE flag

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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>
This commit is contained in:
Jens Axboe 2006-06-13 08:26:10 +02:00 • committed by Jens Axboe
parent 271f18f102
commit b31dc66a54
10 changed files with 20 additions and 29 deletions
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2
fs/fs-writeback.c
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@ -623,7 +623,6 @@ int generic_osync_inode(struct inode *inode, struct address_space *mapping, int
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 @@ int generic_osync_inode(struct inode *inode, struct address_space *mapping, int
if (!err)
err = err2;
}
current->flags &= ~PF_SYNCWRITE;
spin_lock(&inode_lock);
if ((inode->i_state & I_DIRTY) &&