From: Will Deacon <will.deacon@arm.com> To: linux-kernel@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, Jeremy.Linton@arm.com, peterz@infradead.org, mingo@redhat.com, longman@redhat.com, boqun.feng@gmail.com, paulmck@linux.vnet.ibm.com, Will Deacon <will.deacon@arm.com> Subject: [PATCH 0/6] Switch arm64 over to qrwlock Date: Thu, 5 Oct 2017 13:54:51 +0100 [thread overview] Message-ID: <1507208097-825-1-git-send-email-will.deacon@arm.com> (raw) Hi all, This patch series reworks bits of the qrwlock code that it can be used to replace the asm rwlocks currently implemented for arm64. The structure of the series is: Patches 1-3 : Work WFE into qrwlock using atomic_cond_read_acquire so we can avoid busy-waiting. Patch 4 : Enable qrwlocks for arm64 Patch 5-6 : Ensure writer slowpath fairness. This has a potential performance impact on the writer unlock path, so I've kept them at the end. The patches apply on top of my other locking cleanups: http://lkml.kernel.org/r/1507055129-12300-1-git-send-email-will.deacon@arm.com although the conflict with mainline is trivial to resolve without those. The full stack is also pushed here: git://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git qrwlock All comments (particularly related to testing and performance) welcome! Cheers, Will --->8 Will Deacon (6): 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 kernel/locking: Remove unused union members from struct qrwlock 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 | 14 +-- include/asm-generic/qrwlock_types.h | 2 +- include/linux/atomic.h | 4 + kernel/locking/qrwlock.c | 83 +++------------- 9 files changed, 43 insertions(+), 251 deletions(-) -- 2.1.4
WARNING: multiple messages have this Message-ID (diff)
From: will.deacon@arm.com (Will Deacon) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 0/6] Switch arm64 over to qrwlock Date: Thu, 5 Oct 2017 13:54:51 +0100 [thread overview] Message-ID: <1507208097-825-1-git-send-email-will.deacon@arm.com> (raw) Hi all, This patch series reworks bits of the qrwlock code that it can be used to replace the asm rwlocks currently implemented for arm64. The structure of the series is: Patches 1-3 : Work WFE into qrwlock using atomic_cond_read_acquire so we can avoid busy-waiting. Patch 4 : Enable qrwlocks for arm64 Patch 5-6 : Ensure writer slowpath fairness. This has a potential performance impact on the writer unlock path, so I've kept them at the end. The patches apply on top of my other locking cleanups: http://lkml.kernel.org/r/1507055129-12300-1-git-send-email-will.deacon at arm.com although the conflict with mainline is trivial to resolve without those. The full stack is also pushed here: git://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git qrwlock All comments (particularly related to testing and performance) welcome! Cheers, Will --->8 Will Deacon (6): 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 kernel/locking: Remove unused union members from struct qrwlock 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 | 14 +-- include/asm-generic/qrwlock_types.h | 2 +- include/linux/atomic.h | 4 + kernel/locking/qrwlock.c | 83 +++------------- 9 files changed, 43 insertions(+), 251 deletions(-) -- 2.1.4
next reply other threads:[~2017-10-05 12:54 UTC|newest] Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-10-05 12:54 Will Deacon [this message] 2017-10-05 12:54 ` [PATCH 0/6] Switch arm64 over to qrwlock Will Deacon 2017-10-05 12:54 ` [PATCH 1/6] kernel/locking: Use struct qrwlock instead of struct __qrwlock Will Deacon 2017-10-05 12:54 ` Will Deacon 2017-10-05 12:54 ` [PATCH 2/6] locking/atomic: Add atomic_cond_read_acquire Will Deacon 2017-10-05 12:54 ` Will Deacon 2017-10-05 12:54 ` [PATCH 3/6] kernel/locking: Use atomic_cond_read_acquire when spinning in qrwlock Will Deacon 2017-10-05 12:54 ` Will Deacon 2017-10-05 12:54 ` [PATCH 4/6] arm64: locking: Move rwlock implementation over to qrwlocks Will Deacon 2017-10-05 12:54 ` Will Deacon 2017-10-05 12:54 ` [PATCH 5/6] kernel/locking: Prevent slowpath writers getting held up by fastpath Will Deacon 2017-10-05 12:54 ` Will Deacon 2017-10-05 13:56 ` Peter Zijlstra 2017-10-05 13:56 ` Peter Zijlstra 2017-10-05 14:37 ` Waiman Long 2017-10-05 14:37 ` Waiman Long 2017-10-05 14:42 ` Will Deacon 2017-10-05 14:42 ` Will Deacon 2017-10-05 12:54 ` [PATCH 6/6] kernel/locking: Remove unused union members from struct qrwlock Will Deacon 2017-10-05 12:54 ` Will Deacon 2017-10-05 22:12 ` [PATCH 0/6] Switch arm64 over to qrwlock Jeremy Linton 2017-10-05 22:12 ` Jeremy Linton 2017-10-06 8:39 ` Will Deacon 2017-10-06 8:39 ` Will Deacon 2017-10-10 15:17 Jan Glauber
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