From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-yb1-f202.google.com (mail-yb1-f202.google.com [209.85.219.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DCC1715B0F9 for ; Wed, 15 May 2024 19:36:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715801793; cv=none; b=aLhbIJM72gchqDmJMepD0S0LvzTxwr5Xl/Ib9aC7jFSvxxut5L1WvyXEV65XZP6lRGt6008VhqJOeIm5H62Flyvqr6EfTIB3peVC/h10fOyyRpdqXcprxHQZQsuDhu0HeP7pr5S/ahaWIpfCB6t3ZRvc5eOMjPgF2uAIpVHavCs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715801793; c=relaxed/simple; bh=0lSt7QVBUAdOGQGjlbIPqXYDj232a+VWY9UlJ/ZrpNU=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=ggU3oCNLp44jFJ0Yw9dYeF4fROpflXv6yOUw5j3C0opgkr91XUhd9Qvcoc86pnZNei+diBznTixK6PQDUkPuUSJWJfyJuf0RFddPUMBvK3bgFmwfraMuvSnrDQhismDZX2SW+MgzLuseND3REggOHmf1mVy1pQcBNcJ43Wb2VqI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--yabinc.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=nqcJeDG4; arc=none smtp.client-ip=209.85.219.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--yabinc.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="nqcJeDG4" Received: by mail-yb1-f202.google.com with SMTP id 3f1490d57ef6-de74a2635e2so11860908276.3 for ; Wed, 15 May 2024 12:36:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1715801791; x=1716406591; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=YlmXNn2pYx8wzd3I64r7rBzQTUUgwVUdbiBLIDfo5/M=; b=nqcJeDG4VS51tGH0eNlWJoGayc4RrT+yo5IBujXLTc4nPTLlc2J4p0MMFR32Z7lSaz ppcz2KvOuj7LrhOsRg55PtbeID9JycUPJ3eBGVK/tNGq4VucWozqkxdSfOLbbpO17prQ sWuIwN/jjBE0ZVMEaXfgWjGSIq9S/BjpTOsyJ0pFRhip7B5v0uD4dEKyeFnTS0D5n18u ZOtkM/+FANKK4yv6kaJytaB+sGQZ0xeirNUOBMRqpsASkfeSJfn3MyxcKjiA2GpNJCoe VYBzMiX3v+wqmc/4Hv15pHNVBYWLdjNPr+sHBe+DMe/BXRA9qH02YVCEQXwRfaEcAhmy sgIg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1715801791; x=1716406591; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=YlmXNn2pYx8wzd3I64r7rBzQTUUgwVUdbiBLIDfo5/M=; b=XfN59dZDNQ2Jroxcerl/w8FKW3pKp+eAou/YEQwFHTQDJ6gekMHGxaLHWxN/iReJ4D imrCPIt4bmaMvmljZNqFDUg1Wkx8od2RE1WW3eqLJ0ATiy6OYy6vjaqPx/W7JBpX5DMs GiQRJR1J6Os1FwTmnnVwKIe6Px7H6wiMKLaG3aPTURwF1EYTerW3gyIDNNxEDy/fWlq4 FI0MoROi5uNy1Fobn9P8ui344rYd8QIwblet91fFrBbItRQ52QnPnCavjlEgp/ak8o1l +2Udu49Zaw5enjiedJ92VDha6/8Z9rEZd5KFQBnvG/l04Re7mwmudAbPp/o7NvgqXy4R iAdA== X-Forwarded-Encrypted: i=1; AJvYcCXXg9eMhvhKviX28xz2QiJ+2QqFABBlpdHUkFBKFJ2Zu5ImZttgW+dDqm6bOn2m8rQcsk9kXw2I+IevgdwaijrxSBGY X-Gm-Message-State: AOJu0Yykyh0jpUpo9A5o+pc9cmLenla/7eOsX5AiAeztgNPydM/0BxXC HxoWsjJtI5ujq1Qj+c5+bPzC8Iydixy2btCiDIzyGrSgwzQxyNzs6vfbKlE5mRss1X5K4gmfXtE H X-Google-Smtp-Source: AGHT+IGytyoLkOH431aR7mF4/3pxrMXnoPzF9EPSCOORKbwwc0MQGbSUWr23nIhRDL3iPMPF3Uv+te+uzcs= X-Received: from yabinc-desktop.mtv.corp.google.com ([2620:15c:211:202:6e4e:954d:1e49:f87c]) (user=yabinc job=sendgmr) by 2002:a05:6902:2b83:b0:de5:2ce1:b62d with SMTP id 3f1490d57ef6-dee4f4bfba9mr1543914276.10.1715801790944; Wed, 15 May 2024 12:36:30 -0700 (PDT) Date: Wed, 15 May 2024 12:36:08 -0700 In-Reply-To: <20240515193610.2350456-1-yabinc@google.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240515193610.2350456-1-yabinc@google.com> X-Mailer: git-send-email 2.45.0.rc1.225.g2a3ae87e7f-goog Message-ID: <20240515193610.2350456-3-yabinc@google.com> Subject: [PATCH v5 2/3] perf/core: Check sample_type in perf_sample_save_callchain From: Yabin Cui To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter Cc: linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, Yabin Cui Content-Type: text/plain; charset="UTF-8" Check sample_type in perf_sample_save_callchain() to prevent saving callchain data when it isn't required. Suggested-by: Namhyung Kim Signed-off-by: Yabin Cui --- arch/x86/events/amd/ibs.c | 3 +-- arch/x86/events/intel/ds.c | 6 ++---- include/linux/perf_event.h | 5 +++++ 3 files changed, 8 insertions(+), 6 deletions(-) diff --git a/arch/x86/events/amd/ibs.c b/arch/x86/events/amd/ibs.c index c3a2f6f57770..f02939655b2a 100644 --- a/arch/x86/events/amd/ibs.c +++ b/arch/x86/events/amd/ibs.c @@ -1129,8 +1129,7 @@ static int perf_ibs_handle_irq(struct perf_ibs *perf_ibs, struct pt_regs *iregs) * recorded as part of interrupt regs. Thus we need to use rip from * interrupt regs while unwinding call stack. */ - if (event->attr.sample_type & PERF_SAMPLE_CALLCHAIN) - perf_sample_save_callchain(&data, event, iregs); + perf_sample_save_callchain(&data, event, iregs); throttle = perf_event_overflow(event, &data, ®s); out: diff --git a/arch/x86/events/intel/ds.c b/arch/x86/events/intel/ds.c index e010bfed8417..c2b5585aa6d1 100644 --- a/arch/x86/events/intel/ds.c +++ b/arch/x86/events/intel/ds.c @@ -1655,8 +1655,7 @@ static void setup_pebs_fixed_sample_data(struct perf_event *event, * previous PMI context or an (I)RET happened between the record and * PMI. */ - if (sample_type & PERF_SAMPLE_CALLCHAIN) - perf_sample_save_callchain(data, event, iregs); + perf_sample_save_callchain(data, event, iregs); /* * We use the interrupt regs as a base because the PEBS record does not @@ -1823,8 +1822,7 @@ static void setup_pebs_adaptive_sample_data(struct perf_event *event, * previous PMI context or an (I)RET happened between the record and * PMI. */ - if (sample_type & PERF_SAMPLE_CALLCHAIN) - perf_sample_save_callchain(data, event, iregs); + perf_sample_save_callchain(data, event, iregs); *regs = *iregs; /* The ip in basic is EventingIP */ diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index fefac1a57b56..bda066c33120 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -1235,6 +1235,11 @@ static inline void perf_sample_save_callchain(struct perf_sample_data *data, { int size = 1; + if (!(event->attr.sample_type & PERF_SAMPLE_CALLCHAIN)) + return; + if (WARN_ON_ONCE(data->sample_flags & PERF_SAMPLE_CALLCHAIN)) + return; + data->callchain = perf_callchain(event, regs); size += data->callchain->nr; -- 2.45.0.rc1.225.g2a3ae87e7f-goog