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From: Lian Wang <lianux.mm@gmail.com>
To: Boqun Feng <boqun@kernel.org>
Cc: Kunwu Chan <kunwu.chan@gmail.com>,
	stern@rowland.harvard.edu, parri.andrea@gmail.com,
	will@kernel.org, peterz@infradead.org, npiggin@gmail.com,
	dhowells@redhat.com, j.alglave@ucl.ac.uk, luc.maranget@inria.fr,
	paulmck@kernel.org, corbet@lwn.net, mingo@redhat.com,
	dave@stgolabs.net, josh@joshtriplett.org, frederic@kernel.org,
	neeraj.upadhyay@kernel.org, urezki@gmail.com, akiyks@gmail.com,
	dlustig@nvidia.com, joelagnelf@nvidia.com,
	skhan@linuxfoundation.org, rdunlap@infradead.org,
	longman@redhat.com, rostedt@goodmis.org,
	mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com,
	qiang.zhang@linux.dev, include@grrlz.net,
	linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
	lkmm@lists.linux.dev, linux-doc@vger.kernel.org,
	rcu@vger.kernel.org, lianux.mm@gmail.com
Subject: Re: [RFC/WIP PATCH 1/4] hazptr: add shared-scan kthread
Date: Tue, 22 Sep 2026 16:44:37 +0800	[thread overview]
Message-ID: <20260922084447.58084-1-lianux.mm@gmail.com> (raw)
In-Reply-To: <arI8KNUjYNFBwKf8@MacBook-0RXW5>

Hi Boqun,

Thanks for the suggestion. Kunwu and I will work together on the next
iteration of the shared-scan design, including your idea of avoiding
per-synchronize allocations with a Bloom filter. We will also run the
rcuscale comparisons and collect IPI counts for the lockdep workloads
you suggested, then share the results with the thread.

Thanks,
Lian

On Tue, 22 Sep 2026 10:28:24 +0200 Boqun Feng <boqun@kernel.org> wrote:

> This would requires allocation during hazptr_synchronize() and I would
> like to avoid that (it's going to introduce a "allocating memory to free
> memory" case).
>
> Mathieu brought up a useful data structure for the scan: A Bloom filter:
>
> Willing to give it a try?

  reply	other threads:[~2026-09-22  8:45 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-09-22  7:09 [RFC/WIP PATCH 0/4] hazptr: add shared scan path and lockdep use case Kunwu Chan
2026-09-22  7:09 ` [RFC/WIP PATCH 1/4] hazptr: add shared-scan kthread Kunwu Chan
2026-09-22  8:28   ` Boqun Feng
2026-09-22  8:44     ` Lian Wang [this message]
2026-09-23  3:16     ` KunWu Chan
2026-09-22  7:09 ` [RFC/WIP PATCH 2/4] locking/lockdep: use hazptr to wait for dynamic key lookups Kunwu Chan
2026-09-22  8:51   ` Boqun Feng
2026-09-23  4:15     ` KunWu Chan
2026-09-22  7:09 ` [RFC/WIP PATCH 3/4] rcuscale: add hazptr scale type Kunwu Chan
2026-09-22  7:55   ` Boqun Feng
2026-09-23  4:40     ` KunWu Chan
2026-09-22  7:09 ` [RFC/WIP PATCH 4/4] Documentation/litmus-tests: add hazptr acquire-before-scan test Kunwu Chan
2026-09-22  7:48 ` [RFC/WIP PATCH 0/4] hazptr: add shared scan path and lockdep use case Boqun Feng
2026-09-22  9:55   ` KunWu Chan

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