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-- | 11.2 KB |
| Kconfig.debug | -rw-r--r-- | 908 bytes |
| Makefile | -rw-r--r-- | 1.7 KB |
| backing-dev.c | -rw-r--r-- | 20.8 KB |
| bootmem.c | -rw-r--r-- | 20.8 KB |
| bounce.c | -rw-r--r-- | 6.5 KB |
| compaction.c | -rw-r--r-- | 19.1 KB |
| debug-pagealloc.c | -rw-r--r-- | 2.5 KB |
| dmapool.c | -rw-r--r-- | 13.0 KB |
| fadvise.c | -rw-r--r-- | 3.5 KB |
| failslab.c | -rw-r--r-- | 1.6 KB |
| filemap.c | -rw-r--r-- | 68.0 KB |
| filemap_xip.c | -rw-r--r-- | 11.0 KB |
| fremap.c | -rw-r--r-- | 6.7 KB |
| highmem.c | -rw-r--r-- | 10.3 KB |
| huge_memory.c | -rw-r--r-- | 61.7 KB |
| hugetlb.c | -rw-r--r-- | 75.8 KB |
| hwpoison-inject.c | -rw-r--r-- | 3.3 KB |
| init-mm.c | -rw-r--r-- | 647 bytes |
| internal.h | -rw-r--r-- | 7.1 KB |
| kmemcheck.c | -rw-r--r-- | 2.8 KB |
| kmemleak-test.c | -rw-r--r-- | 3.3 KB |
| kmemleak.c | -rw-r--r-- | 49.7 KB |
| ksm.c | -rw-r--r-- | 54.4 KB |
| maccess.c | -rw-r--r-- | 1.6 KB |
| madvise.c | -rw-r--r-- | 11.5 KB |
| memblock.c | -rw-r--r-- | 22.7 KB |
| memcontrol.c | -rw-r--r-- | 133.6 KB |
| memory-failure.c | -rw-r--r-- | 39.3 KB |
| memory.c | -rw-r--r-- | 106.2 KB |
| memory_hotplug.c | -rw-r--r-- | 22.3 KB |
| mempolicy.c | -rw-r--r-- | 67.5 KB |
| mempool.c | -rw-r--r-- | 8.9 KB |
| migrate.c | -rw-r--r-- | 31.9 KB |
| mincore.c | -rw-r--r-- | 7.7 KB |
| mlock.c | -rw-r--r-- | 15.5 KB |
| mm_init.c | -rw-r--r-- | 3.7 KB |
| mmap.c | -rw-r--r-- | 70.1 KB |
| mmu_context.c | -rw-r--r-- | 1.4 KB |
| mmu_notifier.c | -rw-r--r-- | 9.1 KB |
| mmzone.c | -rw-r--r-- | 1.8 KB |
| mprotect.c | -rw-r--r-- | 7.9 KB |
| mremap.c | -rw-r--r-- | 13.2 KB |
| msync.c | -rw-r--r-- | 2.4 KB |
| nobootmem.c | -rw-r--r-- | 11.0 KB |
| nommu.c | -rw-r--r-- | 50.9 KB |
| oom_kill.c | -rw-r--r-- | 21.0 KB |
| page-writeback.c | -rw-r--r-- | 39.7 KB |
| page_alloc.c | -rw-r--r-- | 157.0 KB |
| page_cgroup.c | -rw-r--r-- | 11.8 KB |
| page_io.c | -rw-r--r-- | 3.2 KB |
| page_isolation.c | -rw-r--r-- | 3.6 KB |
| pagewalk.c | -rw-r--r-- | 5.0 KB |
| percpu-km.c | -rw-r--r-- | 2.8 KB |
| percpu-vm.c | -rw-r--r-- | 13.0 KB |
| percpu.c | -rw-r--r-- | 55.4 KB |
| pgtable-generic.c | -rw-r--r-- | 3.3 KB |
| prio_tree.c | -rw-r--r-- | 6.3 KB |
| quicklist.c | -rw-r--r-- | 2.4 KB |
| readahead.c | -rw-r--r-- | 15.1 KB |
| rmap.c | -rw-r--r-- | 45.8 KB |
| shmem.c | -rw-r--r-- | 72.6 KB |
| slab.c | -rw-r--r-- | 117.4 KB |
| slob.c | -rw-r--r-- | 17.0 KB |
| slub.c | -rw-r--r-- | 116.0 KB |
| sparse-vmemmap.c | -rw-r--r-- | 5.9 KB |
| sparse.c | -rw-r--r-- | 20.5 KB |
| swap.c | -rw-r--r-- | 18.9 KB |
| swap_state.c | -rw-r--r-- | 10.4 KB |
| swapfile.c | -rw-r--r-- | 65.2 KB |
| thrash.c | -rw-r--r-- | 1.9 KB |
| truncate.c | -rw-r--r-- | 16.6 KB |
| util.c | -rw-r--r-- | 6.8 KB |
| vmalloc.c | -rw-r--r-- | 64.2 KB |
| vmscan.c | -rw-r--r-- | 92.4 KB |
| vmstat.c | -rw-r--r-- | 33.0 KB |
Computing file changes ...
