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smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=FcmqzLxE; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="FcmqzLxE" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8B333C16AAE; Mon, 1 Dec 2025 00:31:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1764549069; bh=eFfeaKnYfm7T1fmmBnN98nZcN0oQn69S6tmyVQbI8DM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FcmqzLxETUROMfc8jbqXaPM0gH9POPPVrtpiBUGfStfpl0nbP11BICLIghFUZD49G TZb6wvBXWXjiSLwNWAJq64QtW00oo7MpqxZ6hgwBO8eqiMmTql0lwz3zDN/8CSeOIj TwP1OcUqgoZqA9mchRBFxO36Npm/SBxSII+rYVkBHWjG/7IFbTGChq2RpxTF5EFru3 MUJtcDnw8QaxRqgLNuTy4RLzVFoXZ076T/e72ggrN4YROu9akJ6wTVu0fyxw7sOu6P qvVj8Mb7yO7QNn3WqwT0Su69XBcXeisi3jw4TkxrQQ4lSqyXcKMMtQ/wQ4VcQKGBWN nKSt2lmxh05Mw== From: guoren@kernel.org To: paul.walmsley@sifive.com, palmer@dabbelt.com, guoren@kernel.org, leobras@redhat.com, ajones@ventanamicro.com, anup@brainfault.org, atish.patra@linux.dev, corbet@lwn.net Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, kvm-riscv@lists.infradead.org, kvm@vger.kernel.org, linux-doc@vger.kernel.org Subject: [RFC PATCH V3 3/4] RISC-V: paravirt: pvqspinlock: Add trace point for pv_kick/wait Date: Sun, 30 Nov 2025 19:30:40 -0500 Message-Id: <20251201003041.695081-4-guoren@kernel.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20251201003041.695081-1-guoren@kernel.org> References: <20251201003041.695081-1-guoren@kernel.org> 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" From: "Guo Ren (Alibaba DAMO Academy)" Add trace point for pv_kick&wait, here is the output: ls /sys/kernel/debug/tracing/events/paravirt/ enable filter pv_kick pv_wait cat /sys/kernel/debug/tracing/trace entries-in-buffer/entries-written: 33927/33927 #P:12 _-----=3D> irqs-off/BH-disabled / _----=3D> need-resched | / _---=3D> hardirq/softirq || / _--=3D> preempt-depth ||| / _-=3D> migrate-disable |||| / delay TASK-PID CPU# ||||| TIMESTAMP FUNCTION | | | ||||| | | sh-100 [001] d..2. 28.312294: pv_wait: cpu 1 out of wfi -0 [000] d.h4. 28.322030: pv_kick: cpu 0 kick targe= t cpu 1 sh-100 [001] d..2. 30.982631: pv_wait: cpu 1 out of wfi -0 [000] d.h4. 30.993289: pv_kick: cpu 0 kick targe= t cpu 1 sh-100 [002] d..2. 44.987573: pv_wait: cpu 2 out of wfi -0 [000] d.h4. 44.989000: pv_kick: cpu 0 kick targe= t cpu 2 -0 [003] d.s3. 51.593978: pv_kick: cpu 3 kick targe= t cpu 4 rcu_sched-15 [004] d..2. 51.595192: pv_wait: cpu 4 out of wfi lock_torture_wr-115 [004] ...2. 52.656482: pv_kick: cpu 4 kick targe= t cpu 2 lock_torture_wr-113 [002] d..2. 52.659146: pv_wait: cpu 2 out of wfi lock_torture_wr-114 [008] d..2. 52.659507: pv_wait: cpu 8 out of wfi lock_torture_wr-114 [008] d..2. 52.663503: pv_wait: cpu 8 out of wfi lock_torture_wr-113 [002] ...2. 52.666128: pv_kick: cpu 2 kick targe= t cpu 8 lock_torture_wr-114 [008] d..2. 52.667261: pv_wait: cpu 8 out of wfi lock_torture_wr-114 [009] .n.2. 53.141515: pv_kick: cpu 9 kick targe= t cpu 11 lock_torture_wr-113 [002] d..2. 53.143339: pv_wait: cpu 2 out of wfi lock_torture_wr-116 [007] d..2. 53.143412: pv_wait: cpu 7 out of wfi lock_torture_wr-118 [000] d..2. 53.143457: pv_wait: cpu 0 out of wfi lock_torture_wr-115 [008] d..2. 53.143481: pv_wait: cpu 8 out of wfi lock_torture_wr-117 [011] d..2. 53.143522: pv_wait: cpu 11 out of wfi lock_torture_wr-117 [011] ...2. 53.143987: pv_kick: cpu 11 kick targ= et cpu 8 lock_torture_wr-115 [008] ...2. 53.144269: pv_kick: cpu 8 kick targe= t cpu 7 Reviewed-by: Leonardo Bras Signed-off-by: Guo Ren (Alibaba DAMO Academy) --- arch/riscv/kernel/qspinlock_paravirt.c | 7 +++ .../kernel/trace_events_filter_paravirt.h | 60 +++++++++++++++++++ 2 files changed, 67 insertions(+) create mode 100644 arch/riscv/kernel/trace_events_filter_paravirt.h diff --git a/arch/riscv/kernel/qspinlock_paravirt.c b/arch/riscv/kernel/qsp= inlock_paravirt.c index 299dddaa14b8..cae991139abe 100644 --- a/arch/riscv/kernel/qspinlock_paravirt.c +++ b/arch/riscv/kernel/qspinlock_paravirt.c @@ -9,8 +9,13 @@ #include #include =20 +#define CREATE_TRACE_POINTS +#include "trace_events_filter_paravirt.h" + void pv_kick(int cpu) { + trace_pv_kick(smp_processor_id(), cpu); + sbi_ecall(SBI_EXT_PVLOCK, SBI_EXT_PVLOCK_KICK_CPU, cpuid_to_hartid_map(cpu), 0, 0, 0, 0, 0); return; @@ -28,6 +33,8 @@ void pv_wait(u8 *ptr, u8 val) goto out; =20 wait_for_interrupt(); + + trace_pv_wait(smp_processor_id()); out: local_irq_restore(flags); } diff --git a/arch/riscv/kernel/trace_events_filter_paravirt.h b/arch/riscv/= kernel/trace_events_filter_paravirt.h new file mode 100644 index 000000000000..db5e702a1f12 --- /dev/null +++ b/arch/riscv/kernel/trace_events_filter_paravirt.h @@ -0,0 +1,60 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c), 2025 Alibaba Damo Academy + * Authors: + * Guo Ren + */ +#undef TRACE_SYSTEM +#define TRACE_SYSTEM paravirt + +#if !defined(_TRACE_PARAVIRT_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_PARAVIRT_H + +#include + +TRACE_EVENT(pv_kick, + TP_PROTO(int cpu, int target), + TP_ARGS(cpu, target), + + TP_STRUCT__entry( + __field(int, cpu) + __field(int, target) + ), + + TP_fast_assign( + __entry->cpu =3D cpu; + __entry->target =3D target; + ), + + TP_printk("cpu %d pv_kick target cpu %d", + __entry->cpu, + __entry->target + ) +); + +TRACE_EVENT(pv_wait, + TP_PROTO(int cpu), + TP_ARGS(cpu), + + TP_STRUCT__entry( + __field(int, cpu) + ), + + TP_fast_assign( + __entry->cpu =3D cpu; + ), + + TP_printk("cpu %d out of wfi", + __entry->cpu + ) +); + +#endif /* _TRACE_PARAVIRT_H || TRACE_HEADER_MULTI_READ */ + +#undef TRACE_INCLUDE_PATH +#undef TRACE_INCLUDE_FILE +#define TRACE_INCLUDE_PATH ../../../arch/riscv/kernel/ +#define TRACE_INCLUDE_FILE trace_events_filter_paravirt + +/* This part must be outside protection */ +#include --=20 2.40.1