Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU... | netdev

[PATCH v6 00/46] CPU hotplug: stop_machine()-free CPU hotplug · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 01/46] percpu_rwlock: Introduce the global reader-writer lock backend · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 02/46] percpu_rwlock: Introduce per-CPU variables for the reader and the writer · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 03/46] percpu_rwlock: Provide a way to define and init percpu-rwlocks at compile time · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Srivatsa S. Bhat <hidden> · 2013-02-18
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Michel Lespinasse <hidden> · 2013-02-18
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Srivatsa S. Bhat <hidden> · 2013-02-18
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Steven Rostedt <rostedt@goodmis.org> · 2013-02-18
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Srivatsa S. Bhat <hidden> · 2013-02-18
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Srivatsa S. Bhat <hidden> · 2013-02-18
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Michel Lespinasse <hidden> · 2013-02-18
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Srivatsa S. Bhat <hidden> · 2013-02-18
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Lai Jiangshan <hidden> · 2013-02-25
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Srivatsa S. Bhat <hidden> · 2013-02-25
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Lai Jiangshan <hidden> · 2013-02-26
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Lai Jiangshan <hidden> · 2013-02-26
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Srivatsa S. Bhat <hidden> · 2013-02-26
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Lai Jiangshan <hidden> · 2013-02-26
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Srivatsa S. Bhat <hidden> · 2013-02-26
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Lai Jiangshan <hidden> · 2013-02-26
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Srivatsa S. Bhat <hidden> · 2013-02-26
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Lai Jiangshan <hidden> · 2013-02-27
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Srivatsa S. Bhat <hidden> · 2013-02-27
[PATCH] lglock: add read-preference local-global rwlock · Lai Jiangshan <hidden> · 2013-03-01
Re: [PATCH] lglock: add read-preference local-global rwlock · Tejun Heo <tj@kernel.org> · 2013-03-01
Re: [PATCH] lglock: add read-preference local-global rwlock · Srivatsa S. Bhat <hidden> · 2013-03-01
Re: [PATCH] lglock: add read-preference local-global rwlock · Oleg Nesterov <oleg@redhat.com> · 2013-03-01
Re: [PATCH] lglock: add read-preference local-global rwlock · Michel Lespinasse <hidden> · 2013-03-02
[PATCH V2] lglock: add read-preference local-global rwlock · Lai Jiangshan <hidden> · 2013-03-02
Re: [PATCH V2] lglock: add read-preference local-global rwlock · Srivatsa S. Bhat <hidden> · 2013-03-02
Re: [PATCH V2] lglock: add read-preference local-global rwlock · Lai Jiangshan <hidden> · 2013-03-05
Re: [PATCH V2] lglock: add read-preference local-global rwlock · Srivatsa S. Bhat <hidden> · 2013-03-05
Re: [PATCH V2] lglock: add read-preference local-global rwlock · Oleg Nesterov <oleg@redhat.com> · 2013-03-02
Re: [PATCH V2] lglock: add read-preference local-global rwlock · Oleg Nesterov <oleg@redhat.com> · 2013-03-03
Re: [PATCH V2] lglock: add read-preference local-global rwlock · Michel Lespinasse <hidden> · 2013-03-05
Re: [PATCH V2] lglock: add read-preference local-global rwlock · Lai Jiangshan <hidden> · 2013-03-05
Re: [PATCH V2] lglock: add read-preference local-global rwlock · Michel Lespinasse <hidden> · 2013-03-05
Re: [PATCH V2] lglock: add read-preference local-global rwlock · Oleg Nesterov <oleg@redhat.com> · 2013-03-05
Re: [PATCH] lglock: add read-preference local-global rwlock · Oleg Nesterov <oleg@redhat.com> · 2013-03-02
Re: [PATCH] lglock: add read-preference local-global rwlock · Lai Jiangshan <hidden> · 2013-03-05
Re: [PATCH] lglock: add read-preference local-global rwlock · Michel Lespinasse <hidden> · 2013-03-05
Re: [PATCH] lglock: add read-preference local-global rwlock · Oleg Nesterov <oleg@redhat.com> · 2013-03-05
Re: [PATCH] lglock: add read-preference local-global rwlock · Lai Jiangshan <hidden> · 2013-03-02
Re: [PATCH] lglock: add read-preference local-global rwlock · Oleg Nesterov <oleg@redhat.com> · 2013-03-02
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Lai Jiangshan <hidden> · 2013-03-01
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Srivatsa S. Bhat <hidden> · 2013-03-01
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Lai Jiangshan <hidden> · 2013-03-05
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Srivatsa S. Bhat <hidden> · 2013-03-05
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Tejun Heo <tj@kernel.org> · 2013-03-01
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Srivatsa S. Bhat <hidden> · 2013-03-01
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Michel Lespinasse <hidden> · 2013-02-27
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Oleg Nesterov <oleg@redhat.com> · 2013-02-27
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Michel Lespinasse <hidden> · 2013-02-28
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Oleg Nesterov <oleg@redhat.com> · 2013-02-28
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Oleg Nesterov <oleg@redhat.com> · 2013-02-28
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Lai Jiangshan <hidden> · 2013-02-26
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Srivatsa S. Bhat <hidden> · 2013-02-26
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Lai Jiangshan <hidden> · 2013-02-26
Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks · Srivatsa S. Bhat <hidden> · 2013-02-26
[PATCH v6 06/46] percpu_rwlock: Rearrange the read-lock code to fastpath nested percpu readers · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 07/46] percpu_rwlock: Allow writers to be readers, and add lockdep annotations · Srivatsa S. Bhat <hidden> · 2013-02-18
Re: [PATCH v6 07/46] percpu_rwlock: Allow writers to be readers, and add lockdep annotations · Michel Lespinasse <hidden> · 2013-02-18
Re: [PATCH v6 07/46] percpu_rwlock: Allow writers to be readers, and add lockdep annotations · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 09/46] CPU hotplug: Convert preprocessor macros to static inline functions · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 10/46] smp, cpu hotplug: Fix smp_call_function_*() to prevent CPU offline properly · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 11/46] smp, cpu hotplug: Fix on_each_cpu_*() to prevent CPU offline properly · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 12/46] sched/timer: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 13/46] sched/migration: Use raw_spin_lock/unlock since interrupts are already disabled · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 14/46] sched/rt: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 15/46] tick: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 16/46] time/clocksource: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 17/46] clockevents: Use get/put_online_cpus_atomic() in clockevents_notify() · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 18/46] softirq: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 19/46] irq: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 21/46] block: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 20/46] net: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 24/46] [SCSI] fcoe: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 25/46] staging: octeon: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 26/46] x86: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 27/46] perf/x86: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 28/46] KVM: Use get/put_online_cpus_atomic() to prevent CPU offline from atomic context · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 29/46] kvm/vmx: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 30/46] x86/xen: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 31/46] alpha/smp: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 32/46] blackfin/smp: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 33/46] cris/smp: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-02-18
Re: [PATCH v6 33/46] cris/smp: Use get/put_online_cpus_atomic() to prevent CPU offline · Jesper Nilsson <jesper.nilsson@axis.com> · 2013-02-18
[PATCH v6 34/46] hexagon/smp: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 35/46] ia64: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 37/46] MIPS: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 38/46] mn10300: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 39/46] parisc: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 40/46] powerpc: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 42/46] sparc: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 43/46] tile: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 44/46] cpu: No more __stop_machine() in _cpu_down() · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 45/46] CPU hotplug, stop_machine: Decouple CPU hotplug from stop_machine() in Kconfig · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 46/46] Documentation/cpu-hotplug: Remove references to stop_machine() · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 41/46] sh: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 36/46] m32r: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 23/46] infiniband: ehca: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 22/46] crypto: pcrypt - Protect access to cpu_online_mask with get/put_online_cpus() · Srivatsa S. Bhat <hidden> · 2013-02-18
[PATCH v6 08/46] CPU hotplug: Provide APIs to prevent CPU offline from atomic context · Srivatsa S. Bhat <hidden> · 2013-02-18
Re: [PATCH v6 08/46] CPU hotplug: Provide APIs to prevent CPU offline from atomic context · Michel Lespinasse <hidden> · 2013-02-18
Re: [PATCH v6 08/46] CPU hotplug: Provide APIs to prevent CPU offline from atomic context · Srivatsa S. Bhat <hidden> · 2013-02-18
Re: [PATCH v6 08/46] CPU hotplug: Provide APIs to prevent CPU offline from atomic context · Michel Lespinasse <hidden> · 2013-02-18
Re: [PATCH v6 08/46] CPU hotplug: Provide APIs to prevent CPU offline from atomic context · Srivatsa S. Bhat <hidden> · 2013-02-18
Re: [PATCH v6 08/46] CPU hotplug: Provide APIs to prevent CPU offline from atomic context · Michel Lespinasse <hidden> · 2013-02-19
Re: [PATCH v6 08/46] CPU hotplug: Provide APIs to prevent CPU offline from atomic context · Srivatsa S. Bhat <hidden> · 2013-02-19
RE: [PATCH v6 08/46] CPU hotplug: Provide APIs to prevent CPU offline from atomic context · David Laight <hidden> · 2013-02-19
Re: [PATCH v6 08/46] CPU hotplug: Provide APIs to prevent CPU offline from atomic context · Srivatsa S. Bhat <hidden> · 2013-02-19
[PATCH v6 05/46] percpu_rwlock: Make percpu-rwlocks IRQ-safe, optimally · Srivatsa S. Bhat <hidden> · 2013-02-18
Re: [PATCH v6 00/46] CPU hotplug: stop_machine()-free CPU hotplug · Rusty Russell <hidden> · 2013-02-25
Re: [PATCH v6 00/46] CPU hotplug: stop_machine()-free CPU hotplug · Srivatsa S. Bhat <hidden> · 2013-02-25
Re: [PATCH v6 00/46] CPU hotplug: stop_machine()-free CPU hotplug · Vincent Guittot <vincent.guittot@linaro.org> · 2013-03-01

Re: [PATCH v6 04/46] percpu_rwlock: Implement the core design of Per-CPU Reader-Writer Locks

From: Steven Rostedt <rostedt@goodmis.org>
Date: 2013-02-18 16:31:33
Also in: linux-arch, linux-arm-kernel, linux-pm, linuxppc-dev, lkml

On Mon, 2013-02-18 at 21:51 +0530, Srivatsa S. Bhat wrote:

Hi Michel,

Yes.. I don't think we can avoid that. Moreover, since we _want_ unfair
reader/writer semantics to allow flexible locking rules and guarantee
deadlock-safety, having a recursive reader side is not even an issue, IMHO.

Recursive unfair reader lock may guarantee deadlock-safety, but
remember, it adds a higher probability of live-locking the write_lock.
Which is another argument to keep this separate to cpu hotplug only.

-- Steve

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