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>
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File | Mode | Size |
---|---|---|
Makefile | -rw-r--r-- | 394 bytes |
compat.c | -rw-r--r-- | 17.0 KB |
compat_mq.c | -rw-r--r-- | 4.1 KB |
ipc_sysctl.c | -rw-r--r-- | 5.1 KB |
ipcns_notifier.c | -rw-r--r-- | 2.2 KB |
mq_sysctl.c | -rw-r--r-- | 2.7 KB |
mqueue.c | -rw-r--r-- | 30.5 KB |
msg.c | -rw-r--r-- | 20.9 KB |
msgutil.c | -rw-r--r-- | 2.8 KB |
namespace.c | -rw-r--r-- | 3.6 KB |
sem.c | -rw-r--r-- | 40.4 KB |
shm.c | -rw-r--r-- | 26.5 KB |
syscall.c | -rw-r--r-- | 2.3 KB |
util.c | -rw-r--r-- | 23.1 KB |
util.h | -rw-r--r-- | 5.3 KB |
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