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| author | Thomas Munro <tmunro@FreeBSD.org> | 2020-06-21 08:51:24 +0000 |
|---|---|---|
| committer | Thomas Munro <tmunro@FreeBSD.org> | 2020-06-21 08:51:24 +0000 |
| commit | f2706588730a5d3b9a687ba8d4269e386650cc4f (patch) | |
| tree | 6af7a3efa2502ab3e819c7aa522f1fd908696bab /sys/fs | |
| parent | 03270b59eed68cc33478a731a12269870e5168d2 (diff) | |
| download | src-f2706588730a5d3b9a687ba8d4269e386650cc4f.tar.gz src-f2706588730a5d3b9a687ba8d4269e386650cc4f.zip | |
vfs: track sequential reads and writes separately
For software like PostgreSQL and SQLite that sometimes reads sequentially
while also writing sequentially some distance behind with interleaved
syscalls on the same fd, performance is better on UFS if we do
sequential access heuristics separately for reads and writes.
Patch originally by Andrew Gierth in 2008, updated and proposed by me with
his permission.
Reviewed by: mjg, kib, tmunro
Approved by: mjg (mentor)
Obtained from: Andrew Gierth <andrew@tao11.riddles.org.uk>
Differential Revision: https://reviews.freebsd.org/D25024
Notes
Notes:
svn path=/head/; revision=362460
Diffstat (limited to 'sys/fs')
| -rw-r--r-- | sys/fs/devfs/devfs_vnops.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sys/fs/devfs/devfs_vnops.c b/sys/fs/devfs/devfs_vnops.c index f038f74e67a0..e7e524d2f0b9 100644 --- a/sys/fs/devfs/devfs_vnops.c +++ b/sys/fs/devfs/devfs_vnops.c @@ -1305,7 +1305,7 @@ devfs_read_f(struct file *fp, struct uio *uio, struct ucred *cred, td->td_fpop = fpop; dev_relthread(dev, ref); - foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF); + foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF_R); return (error); } @@ -1802,7 +1802,7 @@ devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred, td->td_fpop = fpop; dev_relthread(dev, ref); - foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF); + foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF_W); return (error); } |