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-- | 3.0 KB |
| Makefile | -rw-r--r-- | 431 bytes |
| acl.h | -rw-r--r-- | 2.4 KB |
| auth.c | -rw-r--r-- | 2.0 KB |
| auth.h | -rw-r--r-- | 540 bytes |
| cache.h | -rw-r--r-- | 1.6 KB |
| export.c | -rw-r--r-- | 38.8 KB |
| idmap.h | -rw-r--r-- | 2.3 KB |
| lockd.c | -rw-r--r-- | 1.7 KB |
| nfs2acl.c | -rw-r--r-- | 8.6 KB |
| nfs3acl.c | -rw-r--r-- | 6.3 KB |
| nfs3proc.c | -rw-r--r-- | 24.5 KB |
| nfs3xdr.c | -rw-r--r-- | 26.6 KB |
| nfs4acl.c | -rw-r--r-- | 21.5 KB |
| nfs4callback.c | -rw-r--r-- | 25.5 KB |
| nfs4idmap.c | -rw-r--r-- | 13.2 KB |
| nfs4proc.c | -rw-r--r-- | 38.0 KB |
| nfs4recover.c | -rw-r--r-- | 9.3 KB |
| nfs4state.c | -rw-r--r-- | 115.6 KB |
| nfs4xdr.c | -rw-r--r-- | 83.9 KB |
| nfscache.c | -rw-r--r-- | 7.6 KB |
| nfsctl.c | -rw-r--r-- | 38.8 KB |
| nfsd.h | -rw-r--r-- | 14.0 KB |
| nfsfh.c | -rw-r--r-- | 18.3 KB |
| nfsfh.h | -rw-r--r-- | 4.2 KB |
| nfsproc.c | -rw-r--r-- | 20.1 KB |
| nfssvc.c | -rw-r--r-- | 15.6 KB |
| nfsxdr.c | -rw-r--r-- | 13.0 KB |
| state.h | -rw-r--r-- | 15.7 KB |
| stats.c | -rw-r--r-- | 2.7 KB |
| vfs.c | -rw-r--r-- | 53.2 KB |
| vfs.h | -rw-r--r-- | 4.0 KB |
| xdr.h | -rw-r--r-- | 4.0 KB |
| xdr3.h | -rw-r--r-- | 7.9 KB |
| xdr4.h | -rw-r--r-- | 16.9 KB |
Computing file changes ...
