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Tue, 19 Aug 2025 02:35:00 -0700 (PDT) Received: from 7940hx ([43.129.244.20]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-76e7d1314a4sm1990945b3a.41.2025.08.19.02.34.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 Aug 2025 02:34:59 -0700 (PDT) From: Menglong Dong X-Google-Original-From: Menglong Dong To: ast@kernel.org, paulmck@kernel.org Cc: frederic@kernel.org, neeraj.upadhyay@kernel.org, joelagnelf@nvidia.com, josh@joshtriplett.org, boqun.feng@gmail.com, urezki@gmail.com, rostedt@goodmis.org, mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com, qiang.zhang@linux.dev, daniel@iogearbox.net, john.fastabend@gmail.com, andrii@kernel.org, martin.lau@linux.dev, eddyz87@gmail.com, song@kernel.org, yonghong.song@linux.dev, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org, rcu@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH bpf-next v2 4/7] bpf: use rcu_read_lock_dont_migrate() for bpf_iter_run_prog() Date: Tue, 19 Aug 2025 17:34:21 +0800 Message-ID: <20250819093424.1011645-5-dongml2@chinatelecom.cn> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250819093424.1011645-1-dongml2@chinatelecom.cn> References: <20250819093424.1011645-1-dongml2@chinatelecom.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Use rcu_read_lock_dont_migrate() and rcu_read_unlock_migrate() in bpf_iter_run_prog to obtain better performance when PREEMPT_RCU is not enabled. Signed-off-by: Menglong Dong --- v2: - use rcu_read_lock_dont_migrate() instead of rcu_migrate_disable() --- kernel/bpf/bpf_iter.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/kernel/bpf/bpf_iter.c b/kernel/bpf/bpf_iter.c index 0cbcae727079..6ac35430c573 100644 --- a/kernel/bpf/bpf_iter.c +++ b/kernel/bpf/bpf_iter.c @@ -705,13 +705,11 @@ int bpf_iter_run_prog(struct bpf_prog *prog, void *ct= x) migrate_enable(); rcu_read_unlock_trace(); } else { - rcu_read_lock(); - migrate_disable(); + rcu_read_lock_dont_migrate(); old_run_ctx =3D bpf_set_run_ctx(&run_ctx); ret =3D bpf_prog_run(prog, ctx); bpf_reset_run_ctx(old_run_ctx); - migrate_enable(); - rcu_read_unlock(); + rcu_read_unlock_migrate(); } =20 /* bpf program can only return 0 or 1: --=20 2.50.1