John Sully
6ee9d69763
Eliminate the need for an mfence by tricking the CPU into ordering the futex read
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Former-commit-id: 340e6f5bc94cd1c3b0c6fb6da833e8504acaf23a
2021-02-26 01:28:05 +00:00
John Sully
4efab08466
Fix bug in fastlock stack metadata
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Former-commit-id: 241d1bd7e1ed64885adbb07653a5c7e8ef882607
2021-02-07 19:11:05 -05:00
John Sully
495dff1e8c
Implement rehash during spinlock
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Former-commit-id: f68a26381a35b27948046d46c2c7bcfbdc21143d
2021-02-07 19:11:05 -05:00
John Sully
891977d9b7
Fix race in futex_sleep
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Former-commit-id: 73300c57005a49bafbfc44db9c40ba7d1d4eedce
2020-05-31 16:03:50 -04:00
John Sully
d344d9b0b9
Auto tune lock for high CPU tension scenarios
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Former-commit-id: 8edbae2e04538f82a146a6c2b459a6dfcacf99b2
2020-05-30 18:22:27 -04:00
John Sully
1d368edc10
Add double unlock detection and improve fastlock_unlock assmebly
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Former-commit-id: 98aefac09b6b59371e6c1c77d1ef2794bfc5ae62
2020-02-17 19:54:05 -05:00
John Sully
ad0cb8da40
Fix issue #130 due to fastlock timeout reduction
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Former-commit-id: dbef17c2e16f115733242721e9b5a43f01e7a554
2020-01-01 11:52:00 -05:00
John Sully
e16deddd05
Fix deadlock in spinlock (mfence) also spin for less time before sleeping
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Former-commit-id: 8a9045c028128ad1ceaaa7a482ae4d241592d164
2019-11-30 00:51:58 -05:00
John Sully
d46d4cd9ef
Fix failure to wakeup from futex sleep due to fastlock_unlock reading the wrong offset in the asm version. Also fix false sharing in spinlock
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Former-commit-id: 4c8603815cf525c75dcc360fddeab9ca6fe70ae6
2019-11-17 16:06:49 -05:00
John Sully
b1190c24a8
Optimize deadlock detection, fix callstack for ASM, and annotate locks
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Note: This change moves our assembly code to use the GNU Assembler because NASM seems to be incapable of emitting the necessary debug information for callstack unwinding to work.
Former-commit-id: 600fc241cfe79b9b32ac6010c6ea0c66747f0f15
2019-10-22 21:34:51 -04:00
John Sully
8aea7f8586
Implement deadlock detection
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Former-commit-id: fa797408d9c5d5f12053641144fe1a8b24f66185
2019-10-22 00:43:32 -04:00
John Sully
049ca9bf58
Even the next up thread should sleep in the futex
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Former-commit-id: 8b76b01bfe710603bcdc101da6eb27afcee7e1b1
2019-06-17 23:00:12 -04:00
John Sully
dd7cbbe730
Fallback to a futex if we spin for a long time
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Former-commit-id: ec57b4b0248bba671e388a2257b1bd65ed8d0f44
2019-06-17 23:00:12 -04:00
John Sully
fbe1a6c52a
Add debugging stats to the INFO command
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Former-commit-id: ac80a5c6a6676f45ac7d460a9cfb02fef8b48d78
2019-03-19 22:04:33 -04:00
John Sully
8f452efca3
write fastlock_unlock in ASM... because its faster
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Former-commit-id: bad73faf28f879d32c4064389b69c83e9474115a
2019-03-02 16:47:27 -05:00
John Sully
e868502b16
tighten up the spinlock loop, and some other bikeshedding
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Former-commit-id: 8bd56fadd6e73794415e1f9eae892c772800e559
2019-03-01 13:29:21 -05:00
John Sully
f446785084
Rewrite our spinlock in assembly, pretty big performance improvement
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Former-commit-id: 40d7a701feefd36e9e3fdb6d516228c4a70fcf3d
2019-02-25 18:21:27 -05:00
