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 |
|---|---|---|
| Makefile | -rw-r--r-- | 1.4 KB |
| callback_srm.S | -rw-r--r-- | 2.8 KB |
| checksum.c | -rw-r--r-- | 4.5 KB |
| clear_page.S | -rw-r--r-- | 401 bytes |
| clear_user.S | -rw-r--r-- | 2.6 KB |
| copy_page.S | -rw-r--r-- | 532 bytes |
| copy_user.S | -rw-r--r-- | 2.5 KB |
| csum_ipv6_magic.S | -rw-r--r-- | 2.8 KB |
| csum_partial_copy.c | -rw-r--r-- | 8.7 KB |
| dbg_current.S | -rw-r--r-- | 402 bytes |
| dbg_stackcheck.S | -rw-r--r-- | 427 bytes |
| dbg_stackkill.S | -rw-r--r-- | 575 bytes |
| dec_and_lock.c | -rw-r--r-- | 809 bytes |
| divide.S | -rw-r--r-- | 4.2 KB |
| ev6-clear_page.S | -rw-r--r-- | 602 bytes |
| ev6-clear_user.S | -rw-r--r-- | 7.2 KB |
| ev6-copy_page.S | -rw-r--r-- | 4.2 KB |
| ev6-copy_user.S | -rw-r--r-- | 7.3 KB |
| ev6-csum_ipv6_magic.S | -rw-r--r-- | 5.1 KB |
| ev6-divide.S | -rw-r--r-- | 6.2 KB |
| ev6-memchr.S | -rw-r--r-- | 5.2 KB |
| ev6-memcpy.S | -rw-r--r-- | 6.1 KB |
| ev6-memset.S | -rw-r--r-- | 15.8 KB |
| ev6-strncpy_from_user.S | -rw-r--r-- | 11.3 KB |
| ev6-stxcpy.S | -rw-r--r-- | 9.4 KB |
| ev6-stxncpy.S | -rw-r--r-- | 11.2 KB |
| ev67-strcat.S | -rw-r--r-- | 1.5 KB |
| ev67-strchr.S | -rw-r--r-- | 2.7 KB |
| ev67-strlen.S | -rw-r--r-- | 1.2 KB |
| ev67-strlen_user.S | -rw-r--r-- | 2.5 KB |
| ev67-strncat.S | -rw-r--r-- | 2.4 KB |
| ev67-strrchr.S | -rw-r--r-- | 3.2 KB |
| fls.c | -rw-r--r-- | 1.1 KB |
| fpreg.c | -rw-r--r-- | 6.0 KB |
| memchr.S | -rw-r--r-- | 4.9 KB |
| memcpy.c | -rw-r--r-- | 4.0 KB |
| memmove.S | -rw-r--r-- | 2.6 KB |
| memset.S | -rw-r--r-- | 2.9 KB |
| srm_printk.c | -rw-r--r-- | 656 bytes |
| srm_puts.c | -rw-r--r-- | 370 bytes |
| stacktrace.c | -rw-r--r-- | 2.6 KB |
| strcat.S | -rw-r--r-- | 946 bytes |
| strchr.S | -rw-r--r-- | 1.9 KB |
| strcpy.S | -rw-r--r-- | 407 bytes |
| strlen.S | -rw-r--r-- | 1.1 KB |
| strlen_user.S | -rw-r--r-- | 1.9 KB |
| strncat.S | -rw-r--r-- | 1.8 KB |
| strncpy.S | -rw-r--r-- | 1.5 KB |
| strncpy_from_user.S | -rw-r--r-- | 9.9 KB |
| strrchr.S | -rw-r--r-- | 2.7 KB |
| stxcpy.S | -rw-r--r-- | 8.7 KB |
| stxncpy.S | -rw-r--r-- | 10.6 KB |
| udelay.c | -rw-r--r-- | 1.1 KB |
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