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From: Frederic Weisbecker <frederic@kernel.org>
To: Puranjay Mohan <puranjay@kernel.org>
Cc: rcu@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-trace-kernel@vger.kernel.org,
	"Paul E. McKenney" <paulmck@kernel.org>,
	Neeraj Upadhyay <neeraj.upadhyay@kernel.org>,
	Joel Fernandes <joelagnelf@nvidia.com>,
	Josh Triplett <josh@joshtriplett.org>,
	Boqun Feng <boqun@kernel.org>,
	Uladzislau Rezki <urezki@gmail.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	Lai Jiangshan <jiangshanlai@gmail.com>,
	Zqiang <qiang.zhang@linux.dev>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	Davidlohr Bueso <dave@stgolabs.net>
Subject: Re: [RFC PATCH 00/10] RCU: Enable callbacks to benefit from expedited grace periods
Date: Thu, 28 May 2026 14:14:08 +0200	[thread overview]
Message-ID: <ahgxkIbBLkTJyUVt@localhost.localdomain> (raw)
In-Reply-To: <20260417231203.785172-1-puranjay@kernel.org>

Hi,

Le Fri, Apr 17, 2026 at 04:11:48PM -0700, Puranjay Mohan a écrit :
> RCU callbacks only track normal grace period sequence numbers. This
> means callbacks must wait for normal GPs even when expedited GPs have
> already elapsed.
> 
> This series tracks both normal and expedited GP sequences in the
> callback infrastructure using struct rcu_gp_oldstate, so callbacks
> advance when either GP type completes.

What is the motivation behind this? When most callbacks don't have much latency
requirements between queue and invocation?

Thanks.

-- 
Frederic Weisbecker
SUSE Labs

      parent reply	other threads:[~2026-05-28 12:14 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-04-17 23:11 [RFC PATCH 00/10] RCU: Enable callbacks to benefit from expedited grace periods Puranjay Mohan
2026-04-17 23:11 ` [RFC PATCH 01/10] rcu/segcblist: Add SRCU and Tasks RCU wrapper functions Puranjay Mohan
2026-04-17 23:11 ` [RFC PATCH 02/10] rcu/segcblist: Factor out rcu_segcblist_advance_compact() helper Puranjay Mohan
2026-04-17 23:11 ` [RFC PATCH 03/10] rcu/segcblist: Change gp_seq to struct rcu_gp_oldstate gp_seq_full Puranjay Mohan
2026-05-28 12:50   ` Frederic Weisbecker
2026-05-28 13:15   ` Frederic Weisbecker
2026-04-17 23:11 ` [RFC PATCH 04/10] rcu: Add RCU_GET_STATE_NOT_TRACKED for subsystems without expedited GPs Puranjay Mohan
2026-04-17 23:11 ` [RFC PATCH 05/10] rcu: Enable RCU callbacks to benefit from expedited grace periods Puranjay Mohan
2026-04-17 23:11 ` [RFC PATCH 06/10] rcu: Update comments for gp_seq_full and expedited GP tracking Puranjay Mohan
2026-04-17 23:11 ` [RFC PATCH 07/10] rcu: Wake NOCB rcuog kthreads on expedited grace period completion Puranjay Mohan
2026-04-17 23:11 ` [RFC PATCH 08/10] rcu: Detect expedited grace period completion in rcu_pending() Puranjay Mohan
2026-04-17 23:11 ` [RFC PATCH 09/10] rcu: Advance callbacks for expedited GP completion in rcu_core() Puranjay Mohan
2026-04-17 23:11 ` [RFC PATCH 10/10] rcuscale: Add concurrent expedited GP threads for callback scaling tests Puranjay Mohan
2026-05-28 12:14 ` Frederic Weisbecker [this message]

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