diff options
| author | Ingo Molnar <[email protected]> | 2017-10-14 09:26:59 +0200 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2017-10-14 12:50:26 +0200 |
| commit | b483cf3bc249d7af706390efa63d6671e80d1c09 (patch) | |
| tree | 38c2cbb6e3dd37a8ce37d72da96755c504478a20 | |
| parent | c7e2f69d3ed2e56de1f5eaaf37c0f5f91d7adb0a (diff) | |
locking/lockdep: Disable cross-release features for now
Johan Hovold reported a big lockdep slowdown on his system, caused by lockdep:
> I had noticed that the BeagleBone Black boot time appeared to have
> increased significantly with 4.14 and yesterday I finally had time to
> investigate it.
>
> Boot time (from "Linux version" to login prompt) had in fact doubled
> since 4.13 where it took 17 seconds (with my current config) compared to
> the 35 seconds I now see with 4.14-rc4.
>
> I quick bisect pointed to lockdep and specifically the following commit:
>
> 28a903f63ec0 ("locking/lockdep: Handle non(or multi)-acquisition of a crosslock")
Because the final v4.14 release is close, disable the cross-release lockdep
features for now.
Bisected-by: Johan Hovold <[email protected]>
Debugged-by: Johan Hovold <[email protected]>
Reported-by: Johan Hovold <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Byungchul Park <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Tony Lindgren <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
| -rw-r--r-- | lib/Kconfig.debug | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 2689b7c50c52..e2705843c524 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -1092,8 +1092,8 @@ config PROVE_LOCKING select DEBUG_MUTEXES select DEBUG_RT_MUTEXES if RT_MUTEXES select DEBUG_LOCK_ALLOC - select LOCKDEP_CROSSRELEASE - select LOCKDEP_COMPLETIONS + select LOCKDEP_CROSSRELEASE if BROKEN + select LOCKDEP_COMPLETIONS if BROKEN select TRACE_IRQFLAGS default n help |