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Thomas Gleixner authored
The recent futex inode life time fix changed the ordering of the futex key union struct members, but forgot to adjust the hash function accordingly, As a result the hashing omits the leading 64bit and even hashes beyond the futex key causing a bad hash distribution which led to a ~100% performance regression. Hand in the futex key pointer instead of a random struct member and make the size calculation based of the struct offset. Fixes: 8019ad13 ("futex: Fix inode life-time issue") Reported-by:
Rong Chen <rong.a.chen@intel.com> Decoded-by:
Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Tested-by:
Rong Chen <rong.a.chen@intel.com> Link: https://lkml.kernel.org/r/87h7yy90ve.fsf@nanos.tec.linutronix.de
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