Revision c4f675cd40d955d539180506c09515c90169b15b authored by Sergei Trofimovich on 20 May 2011, 20:20:30 UTC, committed by Chris Mason on 23 May 2011, 17:24:14 UTC
Observed as a large delay when --mixed filesystem is filled up.
Test example:
1. create tiny --mixed FS:
$ dd if=/dev/zero of=2G.img seek=$((2048 * 1024 * 1024 - 1)) count=1 bs=1
$ mkfs.btrfs --mixed 2G.img
$ mount -oloop 2G.img /mnt/ut/
2. Try to fill it up:
$ dd if=/dev/urandom of=10M.file bs=10240 count=1024
$ seq 1 256 | while read file_no; do echo $file_no; time cp 10M.file ${file_no}.copy; done
Up to '200.copy' it goes fast, but when disk fills-up each -ENOSPC
message takes 3 seconds to pop-up _every_ ENOSPC (and in usermode linux
it's even more: 30-60 seconds!). (Maybe, time depends on kernel's timer resolution).
No IO, no CPU load, just rescheduling. Some debugging revealed busy spinning
in shrink_delalloc.
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
Reviewed-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
1 parent 0f3b708
| File | Mode | Size |
|---|---|---|
| Kconfig | -rw-r--r-- | 3.3 KB |
| Makefile | -rw-r--r-- | 1.1 KB |
| README | -rw-r--r-- | 7.9 KB |
| bitmap.c | -rw-r--r-- | 37.0 KB |
| dir.c | -rw-r--r-- | 8.8 KB |
| do_balan.c | -rw-r--r-- | 57.0 KB |
| file.c | -rw-r--r-- | 10.3 KB |
| fix_node.c | -rw-r--r-- | 77.2 KB |
| hashes.c | -rw-r--r-- | 3.6 KB |
| ibalance.c | -rw-r--r-- | 35.2 KB |
| inode.c | -rw-r--r-- | 92.0 KB |
| ioctl.c | -rw-r--r-- | 5.4 KB |
| item_ops.c | -rw-r--r-- | 18.7 KB |
| journal.c | -rw-r--r-- | 122.3 KB |
| lbalance.c | -rw-r--r-- | 41.4 KB |
| lock.c | -rw-r--r-- | 2.6 KB |
| namei.c | -rw-r--r-- | 44.1 KB |
| objectid.c | -rw-r--r-- | 6.9 KB |
| prints.c | -rw-r--r-- | 20.7 KB |
| procfs.c | -rw-r--r-- | 14.7 KB |
| resize.c | -rw-r--r-- | 6.2 KB |
| stree.c | -rw-r--r-- | 64.3 KB |
| super.c | -rw-r--r-- | 62.3 KB |
| tail_conversion.c | -rw-r--r-- | 9.1 KB |
| xattr.c | -rw-r--r-- | 26.6 KB |
| xattr_acl.c | -rw-r--r-- | 12.7 KB |
| xattr_security.c | -rw-r--r-- | 3.0 KB |
| xattr_trusted.c | -rw-r--r-- | 1.4 KB |
| xattr_user.c | -rw-r--r-- | 1.3 KB |
Computing file changes ...
