From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f201.google.com (mail-pg1-f201.google.com [209.85.215.201]) (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 3909A7BAEC for ; Wed, 6 Nov 2024 00:30:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730853017; cv=none; b=p/D8Lu79N0Dhfn933F6V13oy/IFpgk3ikTEWcp5dTr6C5mU081QsAF0KbqepBX97a2AwRjVVo7mcEq27VdXHLw6ue1jADDRiebMUp1OBOpL+rHZVMzUle64mx5k61jJfqhUDKRQ9CwkVbNOvfkx0BKh0etOd1YYj6qaRm/aXCpY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730853017; c=relaxed/simple; bh=ipcKC+Xvjs/o+uXqM0HBhCtZoSw03gVtAaqWOi3zBKY=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=qHPjDDUzVdYzakNkF8TXDyHq/E5cNS4odHLlyIMd1YTb+IwI5F6n6OTW2lcZIJRcEq5NLwMOZFHV65WBMkaCtkSr9Tp9U+hUK4L1n9BKVFOJbw0X7OrBhnnDVWqyJ2m02ZINa/xrF95se8Rg5GqWG/0V1BGOwWiorIN1XfFaRfw= 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=wVNsCl3e; arc=none smtp.client-ip=209.85.215.201 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="wVNsCl3e" Received: by mail-pg1-f201.google.com with SMTP id 41be03b00d2f7-7ecb7d90673so6562683a12.2 for ; Tue, 05 Nov 2024 16:30:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1730853013; x=1731457813; 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=GAoTW3tUs2GtkxTfJFEZH6td7ala8u+wh1yVC3NdyWs=; b=wVNsCl3e541agEkvGKLitJiMNE0SB+QvzaJNZbr1N+ctQwEU3QI2pemD4l7jX/vfe8 W33iwGNWyt6pYuYwZihtI8Gft9zF2un8qN2dghSqZschCqRPkBGAp5z2ulbNaFulTU0E G7Wlbi9VvR5tdTajY963+AV0diCTn0ZzJT9qfSQFgq2aLVjfwTCLk/BVx0VV69pUDQrX 2gzJN2Q4jOtYnq21gBson4fCrInLGOxMgMdlNRe7aMy55ILbNvEdK9kGWocQ2t4SbTq0 puOC5JNaKD74oNu0jwPfxK9KiGhriIsIErZcVNGuy0hY+SNgzswtItWuIpCKl4p2ikeX 5D0Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1730853013; x=1731457813; 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=GAoTW3tUs2GtkxTfJFEZH6td7ala8u+wh1yVC3NdyWs=; b=BZwbbW252gbhyAS6/i142R9ab9YUSwEovBM0TroTlTVxi9lOe6qeTaIp/2kqad3/kq yL+1G81SZx6OlyyYs0DNPNlDEAoFxOJBfmXkzD4r8EcBliFUfBKdKy30AoiFzxjuYq6h n8aN++feFn4ZumpFSShzX9IoWE33bA7ZXsffvUJgCWXi9WXpiJeK2kSOdioZD58CRsMI S7cYIm5/z+7EacC1iQQt49ZFj/jrYBYnvylWRNc7EPAgHoJ9+x9HwT6B6n9GEzTvmlQw Dvfir+3vhBdvXduN11Y7eNF+iWvGuq4AzYp5F/17hHIPJsqha7atvcTs4Zk8Fg25ymQi vFmw== X-Gm-Message-State: AOJu0Yy6aji13ESlTBRZXjfPlsqvZX5fEVTd+wOYaZhRt7jgNrCkkLYV A/L7nKIiuC9/erYkmv0sNFdw3NjvqutWDGcTUHFkL+N92Zi4LY+g/liCTbhDBkummw7oobwcOKi NHUZexvARpNC/7JnFMIUbbdEnJjNTojfcDjlB5iNGZylGn7oYLTPE3gXUavsoj6samJ2Um/rMka NZaLJY9Jmnh2hE9eRS34npJgDQ/g8lLl4PAUxj9VYy X-Google-Smtp-Source: AGHT+IGyAvc3UlnyxoY/s+DSBEx42PIPHB2evs1WX6ROqJhqhRsN02w8YFLGFUPp2xXFilKc/9DOuYBKnK0= X-Received: from colette.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:ce7]) (user=ctshao job=sendgmr) by 2002:a63:dd4b:0:b0:7ea:3fa9:9fce with SMTP id 41be03b00d2f7-7ee4130b465mr50558a12.7.1730853012257; Tue, 05 Nov 2024 16:30:12 -0800 (PST) Date: Wed, 6 Nov 2024 00:30:06 +0000 In-Reply-To: <20241106003007.2112584-1-ctshao@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241106003007.2112584-1-ctshao@google.com> X-Mailer: git-send-email 2.47.0.199.ga7371fff76-goog Message-ID: <20241106003007.2112584-2-ctshao@google.com> Subject: [PATCH v3 2/3] perf: Reveal PMU type in fdinfo From: Chun-Tse Shao To: linux-kernel@vger.kernel.org Cc: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , Kan Liang , Ze Gao , Chun-Tse Shao , Weilin Wang , 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: 0 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: 65536 Signed-off-by: Chun-Tse Shao Change-Id: Ibea5618aaf00bae6f48a9b2a6e7798ab2b7f23ce --- kernel/events/core.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/kernel/events/core.c b/kernel/events/core.c index cdd09769e6c56..398cac8b208b9 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -55,6 +55,7 @@ #include #include #include +#include #include "internal.h" @@ -6820,6 +6821,14 @@ 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:\t%llu\n", (unsigned long long)event->attr.config); +} + static const struct file_operations perf_fops = { .release = perf_release, .read = perf_read, @@ -6828,6 +6837,7 @@ static const struct file_operations perf_fops = { .compat_ioctl = perf_compat_ioctl, .mmap = perf_mmap, .fasync = perf_fasync, + .show_fdinfo = perf_show_fdinfo, }; /* -- 2.47.0.199.ga7371fff76-goog