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[2.102.14.151]) by smtp.gmail.com with ESMTPSA id af79cd13be357-7e817311ad9sm186328985a.41.2025.08.07.00.15.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 Aug 2025 00:15:42 -0700 (PDT) Date: Thu, 7 Aug 2025 08:15:37 +0100 From: Juri Lelli To: Kuyo Chang Cc: Ingo Molnar , Peter Zijlstra , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , Matthias Brugger , AngeloGioacchino Del Regno , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org Subject: Re: [PATCH] sched/deadline: Add DL server activated message Message-ID: References: <20250805155347.1693676-1-kuyo.chang@mediatek.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250805155347.1693676-1-kuyo.chang@mediatek.com> Hi, On 05/08/25 23:53, Kuyo Chang wrote: > From: kuyo chang > > The DL server is introduced as a replacement for realtime throttling. > When RT throttling is activated, a message > "sched: RT throttling activated" is shown. However, it is currently > difficult for users to know when the DL server is activated. > > This patch adds a similar message to indicate when the DL server > is activated, which helps users debug RT/CFS contention issues. > > Signed-off-by: kuyo chang > --- > kernel/sched/deadline.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c > index e2d51f4306b3..8e0de6cdb980 100644 > --- a/kernel/sched/deadline.c > +++ b/kernel/sched/deadline.c > @@ -2042,6 +2042,9 @@ enqueue_dl_entity(struct sched_dl_entity *dl_se, int flags) > } > > __enqueue_dl_entity(dl_se); > + > + if (dl_server(dl_se)) > + printk_deferred_once("sched: dl_server activated\n"); > } Not sure if we want/need this, but, if we do, I believe fair_server_pick_task() might be a better place to put it, as it's really when the dl-server is called to do its job. Thanks, Juri