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| author |   Steven Rostedt <rostedt@goodmis.org> | 2021-08-15 23:29:25 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2021-08-17 19:06:11 +0200 |
| commit | 992caf7f17243d736fc996770bac6566103778f6 (patch) | |
| tree | b3782229183ce8c5a02f24d1f28590b7a1f517fe /include/linux/spinlock_types_raw.h | |
| parent | locking/rtmutex: Implement equal priority lock stealing (diff) | |
| download | linux-dev-992caf7f17243d736fc996770bac6566103778f6.tar.xz linux-dev-992caf7f17243d736fc996770bac6566103778f6.zip | |
locking/rtmutex: Add adaptive spinwait mechanism
Going to sleep when locks are contended can be quite inefficient when the
contention time is short and the lock owner is running on a different CPU.
The MCS mechanism cannot be used because MCS is strictly FIFO ordered while
for rtmutex based locks the waiter ordering is priority based.
Provide a simple adaptive spinwait mechanism which currently restricts the
spinning to the top priority waiter.
[ tglx: Provide a contemporary changelog, extended it to all rtmutex based
locks and updated it to match the other spin on owner implementations ]
Originally-by: Gregory Haskins <ghaskins@novell.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210815211305.912050691@linutronix.de
Diffstat (limited to 'include/linux/spinlock_types_raw.h')
0 files changed, 0 insertions, 0 deletions