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| author |   Jens Axboe <axboe@suse.de> | 2006-06-13 08:26:10 +0200 |
|---|---|---|
| committer |   Jens Axboe <axboe@nelson.home.kernel.dk> | 2006-06-23 17:10:39 +0200 |
| commit | b31dc66a54ad986b6b73bdc49c8efc17cbad1833 (patch) | |
| tree | 5591383c1cbffe11512da889c971f899333f1a44 /fs/buffer.c | |
| parent | [PATCH] cfq-iosched: Don't set the queue batching limits (diff) | |
| download | linux-dev-b31dc66a54ad986b6b73bdc49c8efc17cbad1833.tar.xz linux-dev-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 'fs/buffer.c')
| -rw-r--r-- | fs/buffer.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/fs/buffer.c b/fs/buffer.c index 23f1f3a68077..373bb6292bdc 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -331,7 +331,6 @@ long do_fsync(struct file *file, int datasync) goto out; } - current->flags |= PF_SYNCWRITE; ret = filemap_fdatawrite(mapping); /* @@ -346,7 +345,6 @@ long do_fsync(struct file *file, int datasync) err = filemap_fdatawait(mapping); if (!ret) ret = err; - current->flags &= ~PF_SYNCWRITE; out: return ret; } |