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bees: drop the balance/logical workaround that has been disabled for two years

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Kernels that needed the balance workaround frankly are too buggy
to run bees at all.  The workaround also makes the locking stories
around logical_ino calls and process exit complicated, so get rid of
it completely.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell
2022-11-19 02:00:17 -05:00
parent 83a2b010e6
commit 9cdeb608f5
3 changed files with 0 additions and 47 deletions
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10
docs/btrfs-kernel.md
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@ -96,16 +96,6 @@ Workarounds for known kernel bugs
at the same time can lead to a kernel hang. The workaround is
to reduce the thread count to 1 with `-c1`.
* **Tree mod log issues**: bees will detect that a btrfs balance is
running, and pause bees activity until the balance is done. This avoids
running both the `LOGICAL_INO` ioctl and btrfs balance at the same time,
which avoids kernel crashes on old kernel versions.
The numbers for "tree mod log issue #" in the above table are arbitrary.
There are a lot of them, and they all behave fairly similarly.
This workaround is less necessary for kernels 5.4.19 and later.
* **Slow backrefs** (aka toxic extents): Under certain conditions,
if the number of references to a single shared extent grows too
high, the kernel consumes more and more CPU while also holding locks