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SubjectRe: [PATCH v3 0/5] Switch arm64 over to qrwlock
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On 10/12/2017 8:20 AM, Will Deacon wrote:
> Hello,
>
> This is version three of the patches previously posted here:
>
> v1: http://lists.infradead.org/pipermail/linux-arm-kernel/2017-October/534666.html
> v2: http://lists.infradead.org/pipermail/linux-arm-kernel/2017-October/534981.html
>
> Changes since v2 include:
>
> * Drop unused cnt argument
> * Fix typo in UNLOCK Kconfig inlining options
> * Added Tested-by tags
>
> Thanks to all of those who provided review and testing feedback!
>
> Will
>
> --->8
>
> Will Deacon (5):
> kernel/locking: Use struct qrwlock instead of struct __qrwlock
> locking/atomic: Add atomic_cond_read_acquire
> kernel/locking: Use atomic_cond_read_acquire when spinning in qrwlock
> arm64: locking: Move rwlock implementation over to qrwlocks
> kernel/locking: Prevent slowpath writers getting held up by fastpath
>
> arch/arm64/Kconfig | 17 ++++
> arch/arm64/include/asm/Kbuild | 1 +
> arch/arm64/include/asm/spinlock.h | 164 +-------------------------------
> arch/arm64/include/asm/spinlock_types.h | 6 +-
> include/asm-generic/atomic-long.h | 3 +
> include/asm-generic/qrwlock.h | 37 ++-----
> include/asm-generic/qrwlock_types.h | 15 ++-
> include/linux/atomic.h | 4 +
> kernel/locking/qrwlock.c | 86 +++--------------
> 9 files changed, 61 insertions(+), 272 deletions(-)
>

Will, I see the same performance improvements that I was getting in v2 of the
patch. I will continue to run these patches on multiple systems over the next
few weeks, months for stability/functionality testing as well.

Tested-by: Adam Wallis <awallis@codeaurora.org>

--
Adam Wallis
Qualcomm Datacenter Technologies as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

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