diff options
| author | Kent Overstreet <kent.overstreet@linux.dev> | 2023-10-31 02:03:32 +0100 |
|---|---|---|
| committer | Kent Overstreet <kent.overstreet@linux.dev> | 2024-01-01 17:47:38 +0100 |
| commit | 011173321f6fb36f47c3aaaf04218bf758b29e17 (patch) | |
| tree | 139d8ac4fde351e503d87251c67e5f2083d5b671 /fs/bcachefs/Kconfig | |
| parent | powerpc: Export kvm_guest static key, for bcachefs six locks (diff) | |
| download | linux-011173321f6fb36f47c3aaaf04218bf758b29e17.tar.xz linux-011173321f6fb36f47c3aaaf04218bf758b29e17.zip | |
bcachefs: six locks: Simplify optimistic spinning
osq lock maintainers don't want it to be used outside of kernel/locking/
- but, we can do better.
Since we have lock handoff signalled via waitlist entries, there's no
reason for optimistic spinning to have to look at the lock at all -
aside from checking lock-owner; we can just spin looking at our waitlist
entry.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Diffstat (limited to 'fs/bcachefs/Kconfig')
| -rw-r--r-- | fs/bcachefs/Kconfig | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/bcachefs/Kconfig b/fs/bcachefs/Kconfig index fddc7be58022..7d3ac9556c98 100644 --- a/fs/bcachefs/Kconfig +++ b/fs/bcachefs/Kconfig @@ -85,6 +85,16 @@ config BCACHEFS_NO_LATENCY_ACCT help This disables device latency tracking and time stats, only for performance testing +config BCACHEFS_SIX_OPTIMISTIC_SPIN + bool "Optimistic spinning for six locks" + depends on BCACHEFS_FS + depends on SMP + default y + help + Instead of immediately sleeping when attempting to take a six lock that + is held by another thread, spin for a short while, as long as the + thread owning the lock is running. + config MEAN_AND_VARIANCE_UNIT_TEST tristate "mean_and_variance unit tests" if !KUNIT_ALL_TESTS depends on KUNIT |