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[54.240.197.231]) by smtp.gmail.com with ESMTPSA id d11-20020adff84b000000b0033e7a102cfesm2167143wrq.64.2024.04.05.07.33.36 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Fri, 05 Apr 2024 07:33:36 -0700 (PDT) From: Puranjay Mohan To: =?utf-8?B?QmrDtnJuIFTDtnBlbA==?= , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , "Eduard Zingerman" , Song Liu , Yonghong Song , John Fastabend , "KP Singh" , Stanislav Fomichev , Hao Luo , Jiri Olsa , Paul Walmsley , Palmer Dabbelt , Albert Ou , bpf@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Pu Lehui Subject: Re: [PATCH bpf-next] riscv, bpf: add internal-only MOV instruction to resolve per-CPU addrs In-Reply-To: <87wmpbnbce.fsf@all.your.base.are.belong.to.us> References: <20240405124348.27644-1-puranjay12@gmail.com> <87wmpbnbce.fsf@all.your.base.are.belong.to.us> Date: Fri, 05 Apr 2024 14:33:34 +0000 Message-ID: Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Bj=C3=B6rn T=C3=B6pel writes: > Puranjay Mohan writes: > >> Support an instruction for resolving absolute addresses of per-CPU >> data from their per-CPU offsets. This instruction is internal-only and >> users are not allowed to use them directly. They will only be used for >> internal inlining optimizations for now between BPF verifier and BPF >> JITs. >> >> RISC-V uses generic per-cpu implementation where the offsets for CPUs >> are kept in an array called __per_cpu_offset[cpu_number]. RISCV stores >> the address of the task_struct in TP register. The first element in >> tast_struct is struct thread_info, and we can get the cpu number by > ^ > k ;-) I need to start using some kind of spell-check in vim :D. >> reading from the TP register + offsetof(struct thread_info, cpu). >> >> Once we have the cpu number in a register we read the offset for that >> cpu from address: &__per_cpu_offset + cpu_number << 3. Then we add this >> offset to the destination register. > > Just to clarify for readers; BPF programs are run with migrate disable, > which means that on RT we can be preempted, which means that per-cpu > operations are trickier (disabling interrupts/preemption). > > However, this BPF instruction is about calculating the per-cpu address, > so the look up can be inlined. > > It's not a per-cpu *operation*. Will add this information to the commit message. >> To measure the improvement from this change, the benchmark in [1] was >> used on Qemu: >> >> Before: >> glob-arr-inc : 1.127 =C2=B1 0.013M/s >> arr-inc : 1.121 =C2=B1 0.004M/s >> hash-inc : 0.681 =C2=B1 0.052M/s >> >> After: >> glob-arr-inc : 1.138 =C2=B1 0.011M/s >> arr-inc : 1.366 =C2=B1 0.006M/s >> hash-inc : 0.676 =C2=B1 0.001M/s >> >> [1] https://github.com/anakryiko/linux/commit/8dec900975ef >> >> Signed-off-by: Puranjay Mohan >> --- >> arch/riscv/net/bpf_jit_comp64.c | 24 ++++++++++++++++++++++++ >> 1 file changed, 24 insertions(+) >> >> diff --git a/arch/riscv/net/bpf_jit_comp64.c b/arch/riscv/net/bpf_jit_co= mp64.c >> index 15e482f2c657..e95bd1d459a4 100644 >> --- a/arch/riscv/net/bpf_jit_comp64.c >> +++ b/arch/riscv/net/bpf_jit_comp64.c >> @@ -12,6 +12,7 @@ >> #include >> #include >> #include >> +#include >> #include "bpf_jit.h" >>=20=20 >> #define RV_FENTRY_NINSNS 2 >> @@ -1089,6 +1090,24 @@ int bpf_jit_emit_insn(const struct bpf_insn *insn= , struct rv_jit_context *ctx, >> emit_or(RV_REG_T1, rd, RV_REG_T1, ctx); >> emit_mv(rd, RV_REG_T1, ctx); >> break; >> + } else if (insn_is_mov_percpu_addr(insn)) { >> + if (rd !=3D rs) >> + emit_mv(rd, rs, ctx); >> +#ifdef CONFIG_SMP >> + /* Load current CPU number in T1 */ >> + emit_ld(RV_REG_T1, offsetof(struct thread_info, cpu), RV_REG_TP, >> + ctx); >> + /* << 3 because offsets are 8 bytes */ >> + emit_slli(RV_REG_T1, RV_REG_T1, 3, ctx); >> + /* Load address of __per_cpu_offset array in T2 */ >> + emit_imm(RV_REG_T2, (u64)&__per_cpu_offset, ctx); > > Did you try using emit_addr() here? I'd guess that'll be fewer > instructions, no? Yes, I should have used that, the address would always be in the range of auipc+addi right? I will try and see.=20 Thanks, Puranjay From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A3896CD11C2 for ; Fri, 5 Apr 2024 14:33:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:References :In-Reply-To:Subject:To:From:Reply-To:Cc:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=hZhuzi3UflAiyhdu/iuXabDYq++3TLnr3Iy4djCSPBk=; b=cWo0uNK2Kp+RmL R5a0Ji4Ryd7T9Vk8hyzUyO56flbr47g21D9CDoa4SFfYKLS5YLHpPVwmJGLCK4uHmHG1NEiQZQbxE Y3U3tTtORRRlcgy+llN8cGRMn/BbCAXVBvJZkrtsoNJw0mtFsLQRSlzkZTXLJ11NcZIhEvZTs6IEv vzxFXLa4JsuSDCu+fPiTiUMX8/0p13ySVuB+O+mMQO26uzSjJ9nniwpiyGx4K/BKwBzcOER8/5FTX qFKU4OWBza7TQkUqqQ2Oob6kuS0hz2smBBJDmAPXRaX/COU7ZXQ++niTYuUXBu2aJszXJQ6ys2mYM wVeXNq1bO9Py316igjnw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rskdW-00000007UIP-2xYS; Fri, 05 Apr 2024 14:33:46 +0000 Received: from mail-wr1-x435.google.com ([2a00:1450:4864:20::435]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rskdS-00000007UDJ-2lHx for linux-riscv@lists.infradead.org; Fri, 05 Apr 2024 14:33:44 +0000 Received: by mail-wr1-x435.google.com with SMTP id ffacd0b85a97d-343e7c20686so485346f8f.1 for ; Fri, 05 Apr 2024 07:33:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1712327617; x=1712932417; darn=lists.infradead.org; h=content-transfer-encoding:mime-version:message-id:date:references :in-reply-to:subject:to:from:from:to:cc:subject:date:message-id :reply-to; bh=XE7bBtXjTLLxuBkd0cUQ4f+BnesVFs7jpuSpsklKO2U=; b=X/jF/F+oiQqnd5Gg3BMyvHN2udx31OTLsH6YmDF4ClMBNbE3v4xJzW87H3m+0J/91l T9fhtN185x6Pf+EwgI/N2j/6vkvHsrXaVC3ezuBCx1WA1tk11Zflf3hsZ0hLixJP7UrH ERG3DuEhFvqCfnCYiONPOWB0xRaYu7jRJIwU5lsDRAOrM9sLhfFSddb3YoDh08ZOKhyd ws4Pez6yBqUmqkPAThQ1gaRyc54+/B8I/X56aGrtuIm+GX6VpkUxDamIm8ixXgeaTh5e ztTzeZM6IF2N+GzTdwY2LGsUINSF42I43FhgaKhL8KKgK91GjKVl7kdUeObcJF6W1oi5 U8Bw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1712327617; x=1712932417; h=content-transfer-encoding:mime-version:message-id:date:references :in-reply-to:subject:to:from:x-gm-message-state:from:to:cc:subject :date:message-id:reply-to; bh=XE7bBtXjTLLxuBkd0cUQ4f+BnesVFs7jpuSpsklKO2U=; b=U8LGVKeoEywUEYZGRzyQHMtnkSt0l3FkYCs+AqNw+mUuMz1MROcDw7nCAjL65Jm2b/ eh08WFi3i/PwJxiFX8jcewAwpfJDik+fdQNz1q+Zjr7kWEw+3g9saVXnzdzNZtKSLGef LwgwIgggCitJJpsZVrDJB1YvvLErbW5rPew1Id+yueHphGsRnIFk7/8U+qNJWz++7Rmu mQqvTrQCLq5eDk3iR/W38rW8obuNkKkmu1XKuSz1+psvM1ZQx9iz81jMLlLm6zanooaF AvZYSk7IEiknFETeA3RCer273YrfPaPUZ4HJu4QmRR3emSfCb6d6AebwYYku4MrAvQ77 OqPg== X-Forwarded-Encrypted: i=1; AJvYcCWFRCioAQT2eeL1HtECzDKtIKS6IAJ2AYQu26thQAAPCEVtp4Fa2jH8L3OnagdLz3/HDrNqM7ppe37sj3I5DVLst+JCDPjaLm2Lsig7Dy+G X-Gm-Message-State: AOJu0Yw0ZD6X7iJrnilmfX4Gdmm1Y41Ef7CwS65VEkERNISyGiCUs+X1 erbhlvNQFqXFMxh1ltZfASKWA7zWPpT4kcwNH1ozTrkKvs3qpqQDzCXjrB3WjMwRy83t X-Google-Smtp-Source: AGHT+IEZHLxAivag9esAnrX7FyCLYw7AgXgDUqm69jkpKf7pmtQeCzm4iQJH8oEUjk/4um4e6tEGng== X-Received: by 2002:a05:6000:229:b0:343:968e:f27c with SMTP id l9-20020a056000022900b00343968ef27cmr1223599wrz.27.1712327617094; Fri, 05 Apr 2024 07:33:37 -0700 (PDT) Received: from localhost (54-240-197-231.amazon.com. [54.240.197.231]) by smtp.gmail.com with ESMTPSA id d11-20020adff84b000000b0033e7a102cfesm2167143wrq.64.2024.04.05.07.33.36 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Fri, 05 Apr 2024 07:33:36 -0700 (PDT) From: Puranjay Mohan To: =?utf-8?B?QmrDtnJuIFTDtnBlbA==?= , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , "Eduard Zingerman" , Song Liu , Yonghong Song , John Fastabend , "KP Singh" , Stanislav Fomichev , Hao Luo , Jiri Olsa , Paul Walmsley , Palmer Dabbelt , Albert Ou , bpf@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Pu Lehui Subject: Re: [PATCH bpf-next] riscv, bpf: add internal-only MOV instruction to resolve per-CPU addrs In-Reply-To: <87wmpbnbce.fsf@all.your.base.are.belong.to.us> References: <20240405124348.27644-1-puranjay12@gmail.com> <87wmpbnbce.fsf@all.your.base.are.belong.to.us> Date: Fri, 05 Apr 2024 14:33:34 +0000 Message-ID: MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240405_073342_722152_58C26540 X-CRM114-Status: GOOD ( 21.12 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; 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