https://github.com/torvalds/linux
Revision 173ce1ca47c489135b2799f70f550e1319ba36d8 authored by David Howells on 11 March 2022, 15:58:21 UTC, committed by Linus Torvalds on 11 March 2022, 18:24:37 UTC
In afs_writepages_region(), if the dirty page we find is undergoing
writeback or write to cache, but the sync_mode is WB_SYNC_NONE, we go
round the loop trying the same page again and again with no pausing or
waiting unless and until another thread manages to clear the writeback
and fscache flags.
Fix this with three measures:
(1) Advance start to after the page we found.
(2) Break out of the loop and return if rescheduling is requested.
(3) Arbitrarily give up after a maximum of 5 skips.
Fixes: 31143d5d515e ("AFS: implement basic file write support")
Reported-by: Marc Dionne <marc.dionne@auristor.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Marc Dionne <marc.dionne@auristor.com>
Acked-by: Marc Dionne <marc.dionne@auristor.com>
Link: https://lore.kernel.org/r/164692725757.2097000.2060513769492301854.stgit@warthog.procyon.org.uk/ # v1
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 4edc076
Tip revision: 173ce1ca47c489135b2799f70f550e1319ba36d8 authored by David Howells on 11 March 2022, 15:58:21 UTC
afs: Fix potential thrashing in afs writeback
afs: Fix potential thrashing in afs writeback
Tip revision: 173ce1c
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| include | ||
| init | ||
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| .clang-format | -rw-r--r-- | 16.6 KB |
| .cocciconfig | -rw-r--r-- | 59 bytes |
| .get_maintainer.ignore | -rw-r--r-- | 71 bytes |
| .gitattributes | -rw-r--r-- | 62 bytes |
| .gitignore | -rw-r--r-- | 1.9 KB |
| .mailmap | -rw-r--r-- | 21.7 KB |
| COPYING | -rw-r--r-- | 496 bytes |
| CREDITS | -rw-r--r-- | 98.9 KB |
| Kbuild | -rw-r--r-- | 1.3 KB |
| Kconfig | -rw-r--r-- | 555 bytes |
| MAINTAINERS | -rw-r--r-- | 627.6 KB |
| Makefile | -rw-r--r-- | 63.5 KB |
| README | -rw-r--r-- | 727 bytes |
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