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[103.168.172.200]) by smtp.gmail.com with ESMTPSA id af79cd13be357-7d3f99a6724sm562079485a.41.2025.06.24.20.11.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Jun 2025 20:11:28 -0700 (PDT) Received: from phl-compute-05.internal (phl-compute-05.phl.internal [10.202.2.45]) by mailfauth.phl.internal (Postfix) with ESMTP id 7CAC4F40066; Tue, 24 Jun 2025 23:11:27 -0400 (EDT) Received: from phl-mailfrontend-02 ([10.202.2.163]) by phl-compute-05.internal (MEProxy); Tue, 24 Jun 2025 23:11:27 -0400 X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeeffedrtddvgddvudeihecutefuodetggdotefrod ftvfcurfhrohhfihhlvgemucfhrghsthforghilhdpuffrtefokffrpgfnqfghnecuuegr ihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjug hrpefhvfevufffkffojghfggfgsedtkeertdertddtnecuhfhrohhmpeeuohhquhhnucfh vghnghcuoegsohhquhhnrdhfvghnghesghhmrghilhdrtghomheqnecuggftrfgrthhtvg hrnhepgeeljeeitdehvdehgefgjeevfeejjeekgfevffeiueejhfeuiefggeeuheeggefg necuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehmrghilhhfrhhomhepsghoqh hunhdomhgvshhmthhprghuthhhphgvrhhsohhnrghlihhthidqieelvdeghedtieegqddu jeejkeehheehvddqsghoqhhunhdrfhgvnhhgpeepghhmrghilhdrtghomhesfhhigihmvg drnhgrmhgvpdhnsggprhgtphhtthhopedviedpmhhouggvpehsmhhtphhouhhtpdhrtghp thhtoheplhhinhhugidqkhgvrhhnvghlsehvghgvrhdrkhgvrhhnvghlrdhorhhgpdhrtg hpthhtoheprhgtuhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlkhhm mheslhhishhtshdrlhhinhhugidruggvvhdprhgtphhtthhopehpvghtvghriiesihhnfh hrrgguvggrugdrohhrghdprhgtphhtthhopehmihhnghhosehkvghrnhgvlhdrohhrghdp rhgtphhtthhopeifihhllheskhgvrhhnvghlrdhorhhgpdhrtghpthhtohepsghoqhhunh drfhgvnhhgsehgmhgrihhlrdgtohhmpdhrtghpthhtoheplhhonhhgmhgrnhesrhgvughh rghtrdgtohhmpdhrtghpthhtohepuggrvhgvsehsthhgohhlrggsshdrnhgvth X-ME-Proxy: Feedback-ID: iad51458e:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Tue, 24 Jun 2025 23:11:26 -0400 (EDT) From: Boqun Feng To: linux-kernel@vger.kernel.org, rcu@vger.kernel.org, lkmm@lists.linux.dev Cc: Peter Zijlstra , Ingo Molnar , Will Deacon , Boqun Feng , Waiman Long , Davidlohr Bueso , "Paul E. McKenney" , Josh Triplett , Frederic Weisbecker , Neeraj Upadhyay , Joel Fernandes , Uladzislau Rezki , Steven Rostedt , Mathieu Desnoyers , Lai Jiangshan , Zqiang , Breno Leitao , aeh@meta.com, netdev@vger.kernel.org, edumazet@google.com, jhs@mojatatu.com, kernel-team@meta.com, Erik Lundgren Subject: [PATCH 2/8] shazptr: Add refscale test Date: Tue, 24 Jun 2025 20:10:55 -0700 Message-Id: <20250625031101.12555-3-boqun.feng@gmail.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) In-Reply-To: <20250625031101.12555-1-boqun.feng@gmail.com> References: <20250625031101.12555-1-boqun.feng@gmail.com> Precedence: bulk X-Mailing-List: lkmm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add the refscale test for shazptr to measure the reader side performance. Signed-off-by: Boqun Feng --- kernel/rcu/refscale.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/kernel/rcu/refscale.c b/kernel/rcu/refscale.c index f11a7c2af778..154520e4ee4c 100644 --- a/kernel/rcu/refscale.c +++ b/kernel/rcu/refscale.c @@ -29,6 +29,7 @@ #include #include #include +#include #include #include #include @@ -890,6 +891,43 @@ static const struct ref_scale_ops typesafe_seqlock_ops = { .name = "typesafe_seqlock" }; +static void ref_shazptr_read_section(const int nloops) +{ + int i; + + for (i = nloops; i >= 0; i--) { + preempt_disable(); + { guard(shazptr)(ref_shazptr_read_section); } + preempt_enable(); + } +} + +static void ref_shazptr_delay_section(const int nloops, const int udl, const int ndl) +{ + int i; + + for (i = nloops; i >= 0; i--) { + preempt_disable(); + { + guard(shazptr)(ref_shazptr_delay_section); + un_delay(udl, ndl); + } + preempt_enable(); + } +} + +static bool ref_shazptr_init(void) +{ + return true; +} + +static const struct ref_scale_ops shazptr_ops = { + .init = ref_shazptr_init, + .readsection = ref_shazptr_read_section, + .delaysection = ref_shazptr_delay_section, + .name = "shazptr" +}; + static void rcu_scale_one_reader(void) { if (readdelay <= 0) @@ -1197,6 +1235,7 @@ ref_scale_init(void) &refcnt_ops, &rwlock_ops, &rwsem_ops, &lock_ops, &lock_irq_ops, &acqrel_ops, &sched_clock_ops, &clock_ops, &jiffies_ops, &typesafe_ref_ops, &typesafe_lock_ops, &typesafe_seqlock_ops, + &shazptr_ops, }; if (!torture_init_begin(scale_type, verbose)) -- 2.39.5 (Apple Git-154)