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authorIngo Molnar <[email protected]>2017-10-14 07:26:59 +0000
committerIngo Molnar <[email protected]>2017-10-14 10:50:26 +0000
commitb483cf3bc249d7af706390efa63d6671e80d1c09 (patch)
tree38c2cbb6e3dd37a8ce37d72da96755c504478a20 /lib/net_utils.c
parentlocking/selftest: Avoid false BUG report (diff)
downloadkernel-b483cf3bc249d7af706390efa63d6671e80d1c09.tar.gz
kernel-b483cf3bc249d7af706390efa63d6671e80d1c09.zip
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]>
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