From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f202.google.com (mail-pl1-f202.google.com [209.85.214.202]) (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 D7C6A2853E0 for ; Tue, 3 Jun 2025 18:16:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748974601; cv=none; b=hKCuTaXz1ty17oJO2fZ7084E8BA1Yzr/tt+9hZtH115R+JuoPbmKINSF5zHwCiEanKstOAUUpAcUxwtA1RiKx9JRm2L7xuNbE/XZr03rfMLll761U61/tm2vUUF1azyx+m3Lwd29C50XZUvESvkQAPlMwI4qyDGClRwt8EiTgW4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748974601; c=relaxed/simple; bh=zzlz0XiaHl9k5I5nTOV3bt+4IyFgiGwUBoM8qCzc6d4=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=fwAd2MytXqx4sNd2sNahefZ7tismiQ/vgLD9Wg3VoX5YKlxTeMaS+5vuoJA1fHOxEC3G90w9moIDhLQGaWX+uyyRvKjRnl9EsVR0K6ayyDm/aKamgAbVwEj8b1j8+3JFDmafrA055FoCsN0qRlwpwoqXqzJPEm8TbkEINzy5e+M= 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=afQCS+m0; arc=none smtp.client-ip=209.85.214.202 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="afQCS+m0" Received: by mail-pl1-f202.google.com with SMTP id d9443c01a7336-234b133b428so41325805ad.3 for ; Tue, 03 Jun 2025 11:16:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1748974599; x=1749579399; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=dlaUJQBmuGJwNHdjlVkIdQC8DooPW/OGsJq5Qkj2en0=; b=afQCS+m0fjrTXuEvT0NFk9IqG8Zgbc9ZE4OV/A/IRPb7yaaNQ/Jmcc79yjpjH2kO9b 0dY0oOURUOmmngCUnxa1I64cGNNDrKb1c8jYlTrlsErtTkON5zARPe0QRurbQKNAc4so Y4aLBkese4+fLCQAajkgAjui4Ax4Gj2xAz4UzHwYrr34/4a3RSsWdhjZTqya0sU2K8DM Nf7wjL/S0wfvdF7mZL+iu70yCNuVmSej09IOdWBXLj9kO6/REtTKngTi/uiSxvDz6L2f 5tpwRpNnkaDHL2vPrfaoetGPARag+Pa6OWF85KO+0o46tY/efsyYPKgYAKEr7t7xrbU3 9pFg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1748974599; x=1749579399; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=dlaUJQBmuGJwNHdjlVkIdQC8DooPW/OGsJq5Qkj2en0=; b=hfJ/5VboBoUESIR4qYUCNhVuOGd2IitA9J7eVje8N8EqLmpIPvbQbxcBU3nBnxAQLT BFWg7lOKjthO+u6dnbuBzzJ9922ULKY50dMEvr+Af3aSxxkudRcAgde2nDQIyhGVq1Q4 nLSUaz9zADVmdLj5ychNMGs+bW2SiqcOz+ym6KDpy18DfvcKcl57NvMMYMk+NNynu3RU 9DQAf4HIf9riEu8vKnL0GmcNCxouPb0G+CvTFOqyHwczURz/ylK1+3NDvRfCi/x8eajg W0gbsbYrDwHmgyyF9y4b/m6RBDNx0Kcb+QduHNyY7MyeAngjNXnrEhzYoRzqR8Bcmgi4 S/1Q== X-Gm-Message-State: AOJu0YzVhqu6JlXODWOr93qwD/fkJDkOe5IZkPV0dJBJjfzeZAA6y1H3 2iTLZWe1bXGALUk9JmoaNYMEH6hvBLVbtOPsLv4EjTaTYiJMmLEsGyWJ5kCRJJ5LfYsfIyKvOy3 NrAqnWD6ObxkwpXL9DE8Gt3tCNJmX16Xu7cui5o5My4JgJjZ+P+SV5NXQPDMj+C/rhWEMeQ08FV oMgCT8/Mtaxn+pf2PLDqNhru9sdlYMr2h69dJFI8d1guxP X-Google-Smtp-Source: AGHT+IGzo+5jSA0iizSd6Tn3gQ4e3xsellXfHop9mUoZhgA5AqQTUoYuEgJH3L+6oxVBfetYe8qPhwiqW9c= X-Received: from plblg15.prod.google.com ([2002:a17:902:fb8f:b0:220:d81a:8975]) (user=ctshao job=prod-delivery.src-stubby-dispatcher) by 2002:a17:902:f611:b0:224:76f:9e4a with SMTP id d9443c01a7336-235291f59aamr292314915ad.14.1748974599152; Tue, 03 Jun 2025 11:16:39 -0700 (PDT) Date: Tue, 3 Jun 2025 11:15:53 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.49.0.1204.g71687c7c1d-goog Message-ID: <20250603181634.1362626-1-ctshao@google.com> Subject: [PATCH v4 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, kan.liang@linux.intel.com, james.clark@linaro.org, howardchu95@gmail.com, weilin.wang@intel.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: 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 Reviewed-by: Ian Rogers Signed-off-by: Chun-Tse Shao --- v4: Removed the first patch in v3 since it is merged. Retested to make sure the patch still work. v3: lore.kernel.org/20241106003007.2112584-2-ctshao@google.com kernel/events/core.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/kernel/events/core.c b/kernel/events/core.c index 95e703891b24..bad563692d63 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -56,6 +56,7 @@ #include #include #include +#include #include "internal.h" @@ -7077,6 +7078,14 @@ 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, @@ -7085,6 +7094,7 @@ static const struct file_operations perf_fops = { .compat_ioctl = perf_compat_ioctl, .mmap = perf_mmap, .fasync = perf_fasync, + .show_fdinfo = perf_show_fdinfo, }; /* -- 2.49.0.1204.g71687c7c1d-goog