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Groups > linux.kernel > #1173584
| Path | csiph.com!aioe.org!bofh.it!news.nic.it!robomod |
|---|---|
| From | Oleg Nesterov <oleg@redhat.com> |
| Newsgroups | linux.kernel |
| Subject | [PATCH 0/3] percpu-rwsem: introduce percpu_rw_semaphore->recursive mode |
| Date | Mon, 29 Jun 2015 02:00:01 +0200 |
| Message-ID | <pGuEp-2Kv-1@gated-at.bofh.it> (permalink) |
| References | <pE91n-3zX-3@gated-at.bofh.it> <pE91o-3zX-11@gated-at.bofh.it> <pEiR3-XU-1@gated-at.bofh.it> <pEqEW-409-31@gated-at.bofh.it> <pEzRU-vQ-15@gated-at.bofh.it> <pEAEj-1rm-19@gated-at.bofh.it> <pETnA-3eq-7@gated-at.bofh.it> |
| X-Original-To | Peter Zijlstra <peterz@infradead.org> |
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| Sender | robomod@news.nic.it |
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| Approved | robomod@news.nic.it |
| Lines | 26 |
| Organization | linux.* mail to news gateway |
| X-Original-Cc | paulmck@linux.vnet.ibm.com, tj@kernel.org, mingo@redhat.com, linux-kernel@vger.kernel.org, der.herr@hofr.at, dave@stgolabs.net, riel@redhat.com, viro@ZenIV.linux.org.uk, torvalds@linux-foundation.org |
| X-Original-Date | Mon, 29 Jun 2015 01:56:14 +0200 |
| X-Original-Message-ID | <20150628235614.GA24454@redhat.com> |
| X-Original-References | <20150622121623.291363374@infradead.org> <20150622122256.480062572@infradead.org> <20150622225739.GA5582@redhat.com> <20150623071637.GA3644@twins.programming.kicks-ass.net> <20150623170122.GA26854@redhat.com> <20150623175318.GE3644@twins.programming.kicks-ass.net> <20150624135049.GA31992@redhat.com> |
| X-Original-Sender | linux-kernel-owner@vger.kernel.org |
| Xref | aioe.org linux.kernel:1173584 |
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On 06/24, Oleg Nesterov wrote: > > So we need percpu_down_write_dont_block_readers(). I already thought > about this before, I'll try to make the patch tomorrow on top of your > changes. Never say tomorrow... > This means that we do not need task_struct->cpuhp_ref, but we can't > avoid livelock we currently have: cpu_hotplug_begin() can never succeed > if the new readers come fast enough. Like with any other "recursive" lock. Peter, I know you don't like the 1st patch. And yes, we could add another mutex into percpu_rw_semaphore instead. But I think it would be better to rely on rcu_sync_enter(). As for completion, we can remove it later. Nevermind, the actual change is 3/3 and it looks simple. Oleg. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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Re: [RFC][PATCH 09/13] hotplug: Replace hotplug lock with percpu-rwsem Oleg Nesterov <oleg@redhat.com> - 2015-06-23 01:00 +0200
[PATCH 0/3] percpu-rwsem: introduce percpu_rw_semaphore->recursive mode Oleg Nesterov <oleg@redhat.com> - 2015-06-29 02:00 +0200
[PATCH 2/3] percpu-rwsem: don't use percpu_rw_semaphore->rw_sem to exclude writers Oleg Nesterov <oleg@redhat.com> - 2015-06-29 02:00 +0200
[PATCH 3/3] percpu-rwsem: introduce percpu_rw_semaphore->recursive mode Oleg Nesterov <oleg@redhat.com> - 2015-06-29 02:00 +0200
[PATCH 1/3] rcusync: introduce rcu_sync_struct->exclusive mode Oleg Nesterov <oleg@redhat.com> - 2015-06-29 02:00 +0200
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