From: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
To: Srikar Dronamraju <srikar@linux.ibm.com>,
LKML <linux-kernel@vger.kernel.org>,
netdev@vger.kernel.org, David S Miller <davem@davemloft.net>
Cc: Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Dust Li <dust.li@linux.alibaba.com>,
D Wythe <alibuda@linux.alibaba.com>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Jon Maloy <jmaloy@redhat.com>,
Kuniyuki Iwashima <kuniyu@google.com>,
linux-sctp@vger.kernel.org,
Mahanta Jambigi <mjambigi@linux.ibm.com>,
Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>,
Paolo Abeni <pabeni@redhat.com>,
Sidraya Jayagond <sidraya@linux.ibm.com>,
Simon Horman <horms@kernel.org>,
Tony Lu <tonylu@linux.alibaba.com>,
Wen Gu <guwen@linux.alibaba.com>,
Wenjia Zhang <wenjia@linux.ibm.com>,
Willem de Bruijn <willemb@google.com>,
Xin Long <lucien.xin@gmail.com>,
Shrikanth Hegde <sshegde@linux.ibm.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Steven Rostedt <rostedt@goodmis.org>,
Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
Valentin Schneider <vschneid@redhat.com>,
K Prateek Nayak <kprateek.nayak@amd.com>,
Srikar Dronamraju <srikar@linux.ibm.com>
Subject: Re: [PATCH 1/2] net/socket: Record preference for synchronous wakeups
Date: Tue, 21 Jul 2026 04:00:59 -0400 [thread overview]
Message-ID: <willemdebruijn.kernel.53771955fa7f@gmail.com> (raw)
In-Reply-To: <20260714013940.4068189-5-srikar@linux.ibm.com>
Srikar Dronamraju wrote:
> Scheduler differentiates between affine and non-affine wakeups by the
> way of sync flags. Scheduler prefers to pull the tasks towards the waker
> if the sync flag is set.
>
> In some cases, socket APIs are blindly requesting sync wakeups. This may
> cause load-balance issues and non-optimal performance.
>
> Record whether the most recent blocking socket operation could benefit
What is the heuristic that determines this?
If respinning, please state that explicitly in the commit message.
> from synchronous wakeups. Subsequent readiness notifications use this
> hint to determine whether WF_SYNC should be propagated.
>
> The flag is advisory and affects only wakeup placement decisions.
>
> Signed-off-by: Srikar Dronamraju <srikar@linux.ibm.com>
next prev parent reply other threads:[~2026-07-21 8:01 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-14 1:39 [PATCH 0/2] net: Use synchronous wakeups selectively Srikar Dronamraju
2026-07-14 1:39 ` [PATCH 1/2] net/socket: Record preference for synchronous wakeups Srikar Dronamraju
2026-07-21 5:00 ` Shrikanth Hegde
2026-07-21 8:00 ` Willem de Bruijn [this message]
2026-07-14 1:39 ` [PATCH 2/2] net/sock: Propagate WF_SYNC only when requested Srikar Dronamraju
2026-07-21 4:50 ` Shrikanth Hegde
2026-07-22 17:08 ` [PATCH 0/2] net: Use synchronous wakeups selectively Jakub Kicinski
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