From: Nicholas Piggin <npiggin@gmail.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: Shrikanth Hegde <sshegde@linux.vnet.ibm.com>,
Srikar Dronamraju <srikar@linux.vnet.ibm.com>,
Nicholas Piggin <npiggin@gmail.com>,
"Nysal Jan K . A" <nysal@linux.ibm.com>
Subject: [PATCH 0/6] powerpc/qspinlock: Fix yield latency bug and other
Date: Mon, 16 Oct 2023 22:42:59 +1000 [thread overview]
Message-ID: <20231016124305.139923-1-npiggin@gmail.com> (raw)
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.
Thanks,
Nick
Nicholas Piggin (6):
powerpc/qspinlock: Fix stale propagated yield_cpu
powerpc/qspinlock: stop queued waiters trying to set lock sleepy
powerpc/qspinlock: propagate owner preemptedness rather than CPU
number
powerpc/qspinlock: don't propagate the not-sleepy state
powerpc/qspinlock: Propagate sleepy if previous waiter is preempted
powerpc/qspinlock: Rename yield_propagate_owner tunable
arch/powerpc/lib/qspinlock.c | 119 +++++++++++++++--------------------
1 file changed, 52 insertions(+), 67 deletions(-)
--
2.42.0
next reply other threads:[~2023-10-16 12:44 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-16 12:42 Nicholas Piggin [this message]
2023-10-16 12:43 ` [PATCH 1/6] powerpc/qspinlock: Fix stale propagated yield_cpu Nicholas Piggin
2023-10-16 12:43 ` [PATCH 2/6] powerpc/qspinlock: stop queued waiters trying to set lock sleepy Nicholas Piggin
2023-10-20 9:50 ` Nysal Jan K.A.
2023-10-16 12:43 ` [PATCH 3/6] powerpc/qspinlock: propagate owner preemptedness rather than CPU number Nicholas Piggin
2023-10-16 12:43 ` [PATCH 4/6] powerpc/qspinlock: don't propagate the not-sleepy state Nicholas Piggin
2023-10-16 12:43 ` [PATCH 5/6] powerpc/qspinlock: Propagate sleepy if previous waiter is preempted Nicholas Piggin
2023-10-16 12:43 ` [PATCH 6/6] powerpc/qspinlock: Rename yield_propagate_owner tunable Nicholas Piggin
2023-10-18 7:41 ` [PATCH 0/6] powerpc/qspinlock: Fix yield latency bug and other Shrikanth Hegde
2023-10-20 10:04 ` Nysal Jan K.A.
2023-10-20 12:01 ` (subset) " Michael Ellerman
2023-10-27 9:59 ` Michael Ellerman
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