(subset) [PATCH 0/6] powerpc/qspinlock: Fix yield latency bug and other

Michael Ellerman mpe at ellerman.id.au
Fri Oct 27 20:59:56 AEDT 2023

On Mon, 16 Oct 2023 22:42:59 +1000, Nicholas Piggin wrote:
> This fixes a long-standing latency bug in the powerpc qspinlock
> implementation that quite a few people have reported and helped
> out with debugging.
> The first patch is a minimal fix that avoids the problem. The
> other patches are streamlining and improvements after the fix.
> [...]

Applied to powerpc/next.

[2/6] powerpc/qspinlock: stop queued waiters trying to set lock sleepy
[3/6] powerpc/qspinlock: propagate owner preemptedness rather than CPU number
[4/6] powerpc/qspinlock: don't propagate the not-sleepy state
[5/6] powerpc/qspinlock: Propagate sleepy if previous waiter is preempted
[6/6] powerpc/qspinlock: Rename yield_propagate_owner tunable


More information about the Linuxppc-dev mailing list