From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f202.google.com (mail-pg1-f202.google.com [209.85.215.202]) (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 7FE4E2D3221 for ; Fri, 21 Nov 2025 23:09:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763766601; cv=none; b=DrGrECB8fB5DECFEqUAZuex5dEg/5p0DsvVDyfzZoIkm2nMVaUBzq99xT4d9QFDbfzzww0O6hPLPwittNo73VLhgCMPalis18JJGwNxLe2acodiKqbHDm+Loxw5ICpVhQh81lsUdn8eTYevGee+2LqJkycownKNZ6u1EYZ43TQc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763766601; c=relaxed/simple; bh=WQ+E42jjzx5EtriBU1AkfRWskkM+RaFSDeEMNlxJRBk=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=cqoZtqmEO4NIQYuQaCPz2tjE3H2z0DMFTj4A2J5hNEeyQTT9oCYFpOQc3BpIKw2RS+XOPowtZdxfATCTE5yei4Wn9uHedVMHawEcncguuxVX9U0bKKnj3LpbyK7OyjTCu0RcSJEgENf/48p5vP66/WzpVHq4DaL72H/upVNBJwk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--ctshao.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=T606xHfo; arc=none smtp.client-ip=209.85.215.202 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--ctshao.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="T606xHfo" Received: by mail-pg1-f202.google.com with SMTP id 41be03b00d2f7-b969f3f5bb1so4502552a12.0 for ; Fri, 21 Nov 2025 15:09:57 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1763766596; x=1764371396; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=7bEhGrYPGcFfMtBX9//YASMyCXpxJhGnB+vTdwTPOKI=; b=T606xHfoZqBR1Y5sjFrNGZfVRiUWm7mEi7lcLW/tAYHLYtCuwKhit1gOswoxY0Ysue OdVLIolKDk7q2EDSWo7Pydi6Y+dQZSSJ2FmZej1zIs/hM05zgQ0AdFrrPwAD274kQs0i ibC4K+wY9dsupDpxCVLQa7IT7q5acrVxocCl7u6bwBo4eWIAIjtpIwjraDQxdSnUW0qa e/Kga9pv5jvxi9DxH9CyF7UuOqWus6XlYoe4jyRd/Z3pE6okDYNLjSZ5vZazh388IoOM L7jKLQOUscZKNcd1wciBO8ZYd1sqCwiNTr4Z+DXlF6QbWP0laOrrLVGMfHVna53ylSyB Q8pA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1763766596; x=1764371396; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=7bEhGrYPGcFfMtBX9//YASMyCXpxJhGnB+vTdwTPOKI=; b=cFpxIm3oMdZbnBj04LQmu16SoWpA3TtUFiuf6XpLLAFa4L8Rl63MCDZclyeWLuw9dH JvTe68xEDTQze7kJYC29VKY+jetNIzqndRr7h8scwjgcjSRfJLRgPYYwMfRTCrl2rrHP 0UtpcLUjPU/Yh8cYlChJZXLsMrB1Kzm+u26HsfZTikDx+Oi8o6gw/Apsq2VXK5xfmixr NrjWPV/7R/m4k6uLkC/4jbVgb2UQiZZAkKqdzef4FYBSeegXBKrAGfeo2BZ9Tcd/EGEH A4FlX4XZOKQRGOFu6LOMPCdOsky1gcS9ztMJSStclRfMFpGPancx5OCw7XvZAHTlzDZx jgCw== X-Forwarded-Encrypted: i=1; AJvYcCVxBb/UvXDP5Alg7YJo9eQu5Ugz3HfQ8t/HmDPB68pbGtlQQbzE4nsoqIq80d0ZT0EbOMu1dQ3mS81iPREFunr4@vger.kernel.org X-Gm-Message-State: AOJu0YzQNM4UDx93Kg8Bc6d8z/Hrnrldifr2HchbqrP9y0ykTwXtzpvc +qT1iSPerMnbvoy0nNzW7vmD8mZ4PJJaxU5jUpiSq59UZuNrAufH4/JZzchbnZjCugZ3S0ECnZF KCPjKUA== X-Google-Smtp-Source: AGHT+IEu2Ztp3ev6snMBcQPFyM/Hy1k8pVn8YDEGyVmHtHrx6RdTB4cBtdZfbZRp2RA3uY2wY2oocxt9X20= X-Received: from dycog5.prod.google.com ([2002:a05:7301:9a85:b0:2a4:791c:9e95]) (user=ctshao job=prod-delivery.src-stubby-dispatcher) by 2002:a05:7301:f05:b0:2a4:3593:c7da with SMTP id 5a478bee46e88-2a71962cfbbmr1050225eec.26.1763766595706; Fri, 21 Nov 2025 15:09:55 -0800 (PST) Date: Fri, 21 Nov 2025 15:09:11 -0800 Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.52.0.rc2.455.g230fcf2819-goog Message-ID: <20251121230951.3240124-1-ctshao@google.com> Subject: [PATCH v5 1/2] perf: Reveal PMU type in fdinfo From: Chun-Tse Shao To: linux-kernel@vger.kernel.org Cc: Chun-Tse Shao , Ian Rogers , peterz@infradead.org, mingo@redhat.com, acme@kernel.org, namhyung@kernel.org, mark.rutland@arm.com, alexander.shishkin@linux.intel.com, jolsa@kernel.org, adrian.hunter@intel.com, thomas.falcon@intel.com, kan.liang@linux.intel.com, howardchu95@gmail.com, linux-perf-users@vger.kernel.org Content-Type: text/plain; charset="UTF-8" It gives useful info on knowing which PMUs are reserved by this process. Also add config which would be useful. Testing cycles: $ ./perf stat -e cycles & $ cat /proc/`pidof perf`/fdinfo/3 pos: 0 flags: 02000002 mnt_id: 16 ino: 3081 perf_event_attr.type: 0 perf_event_attr.config: 0x0 perf_event_attr.config1: 0x0 perf_event_attr.config2: 0x0 perf_event_attr.config3: 0x0 Testing L1-dcache-load-misses: $ ./perf stat -e L1-dcache-load-misses & $ cat /proc/`pidof perf`/fdinfo/3 pos: 0 flags: 02000002 mnt_id: 16 ino: 1072 perf_event_attr.type: 3 perf_event_attr.config: 0x10000 perf_event_attr.config1: 0x0 perf_event_attr.config2: 0x0 perf_event_attr.config3: 0x0 Reviewed-by: Ian Rogers Signed-off-by: Chun-Tse Shao --- v5: Added config1, config2 and config3 and print output in hex. v4: lore.kernel.org/20250603181634.1362626-1-ctshao@google.com/ Removed the first patch in v3 since it is merged. Retested to make sure the patch still work. v3: lore.kernel.org/20241106003007.2112584-3-ctshao@google.com/ kernel/events/core.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/kernel/events/core.c b/kernel/events/core.c index 7541f6f85fcb..17a71fe1d538 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -56,6 +56,7 @@ #include #include #include +#include #include "internal.h" @@ -7212,6 +7213,20 @@ static int perf_fasync(int fd, struct file *filp, int on) return 0; } +static void perf_show_fdinfo(struct seq_file *m, struct file *f) +{ + struct perf_event *event = f->private_data; + + seq_printf(m, "perf_event_attr.type:\t%u\n", event->orig_type); + seq_printf(m, "perf_event_attr.config:\t0x%llx\n", (unsigned long long)event->attr.config); + seq_printf(m, "perf_event_attr.config1:\t0x%llx\n", + (unsigned long long)event->attr.config1); + seq_printf(m, "perf_event_attr.config2:\t0x%llx\n", + (unsigned long long)event->attr.config2); + seq_printf(m, "perf_event_attr.config3:\t0x%llx\n", + (unsigned long long)event->attr.config3); +} + static const struct file_operations perf_fops = { .release = perf_release, .read = perf_read, @@ -7220,6 +7235,7 @@ static const struct file_operations perf_fops = { .compat_ioctl = perf_compat_ioctl, .mmap = perf_mmap, .fasync = perf_fasync, + .show_fdinfo = perf_show_fdinfo, }; /* -- 2.52.0.rc2.455.g230fcf2819-goog