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-- | 5.7 KB |
| LICENCE | -rw-r--r-- | 1.4 KB |
| Makefile | -rw-r--r-- | 751 bytes |
| README.Locking | -rw-r--r-- | 7.0 KB |
| TODO | -rw-r--r-- | 1.9 KB |
| acl.c | -rw-r--r-- | 9.6 KB |
| acl.h | -rw-r--r-- | 1.0 KB |
| background.c | -rw-r--r-- | 4.4 KB |
| build.c | -rw-r--r-- | 10.9 KB |
| compr.c | -rw-r--r-- | 10.2 KB |
| compr.h | -rw-r--r-- | 3.0 KB |
| compr_lzo.c | -rw-r--r-- | 2.3 KB |
| compr_rtime.c | -rw-r--r-- | 2.8 KB |
| compr_rubin.c | -rw-r--r-- | 8.7 KB |
| compr_zlib.c | -rw-r--r-- | 5.8 KB |
| debug.c | -rw-r--r-- | 25.6 KB |
| debug.h | -rw-r--r-- | 8.4 KB |
| dir.c | -rw-r--r-- | 22.9 KB |
| erase.c | -rw-r--r-- | 14.5 KB |
| file.c | -rw-r--r-- | 9.2 KB |
| fs.c | -rw-r--r-- | 19.9 KB |
| gc.c | -rw-r--r-- | 43.9 KB |
| ioctl.c | -rw-r--r-- | 557 bytes |
| jffs2_fs_i.h | -rw-r--r-- | 1.6 KB |
| jffs2_fs_sb.h | -rw-r--r-- | 5.1 KB |
| malloc.c | -rw-r--r-- | 7.4 KB |
| nodelist.c | -rw-r--r-- | 21.7 KB |
| nodelist.h | -rw-r--r-- | 17.8 KB |
| nodemgmt.c | -rw-r--r-- | 27.7 KB |
| os-linux.h | -rw-r--r-- | 7.5 KB |
| read.c | -rw-r--r-- | 6.9 KB |
| readinode.c | -rw-r--r-- | 43.3 KB |
| scan.c | -rw-r--r-- | 35.5 KB |
| security.c | -rw-r--r-- | 2.1 KB |
| summary.c | -rw-r--r-- | 23.5 KB |
| summary.h | -rw-r--r-- | 6.3 KB |
| super.c | -rw-r--r-- | 7.8 KB |
| symlink.c | -rw-r--r-- | 1.8 KB |
| wbuf.c | -rw-r--r-- | 36.5 KB |
| write.c | -rw-r--r-- | 21.3 KB |
| writev.c | -rw-r--r-- | 1.8 KB |
| xattr.c | -rw-r--r-- | 37.7 KB |
| xattr.h | -rw-r--r-- | 4.2 KB |
| xattr_trusted.c | -rw-r--r-- | 1.4 KB |
| xattr_user.c | -rw-r--r-- | 1.4 KB |
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