From nobody Thu Dec 18 04:49:11 2025 Received: from mail-oa1-f74.google.com (mail-oa1-f74.google.com [209.85.160.74]) (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 8BEC71F0E2A for ; Mon, 24 Mar 2025 22:35:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.74 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742855705; cv=none; b=AVr2bSnUNkATOD8AFGNSI3dmOhBjwlDzY/ApiIlqB016m8Ql86vr7owAjl9ALEePHQJAIc7wnj2iMxgMXEPdfkZQJ9aRBMe8bA2THilGwL3cD4WHEqeW39xG5ogQYfBrSa0C1yoGilrXj/Zpi3wxibnVhGMXDFqDTzEsiW7fHB0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742855705; c=relaxed/simple; bh=/B7cAvSrRfNXbB5b3SzCIR4ejZKLzspf1N2+U2b5jiY=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Content-Type; b=Ii2EzI/hbo9rEeb2W5YosFdr/05Ma8oXZN+03/xdFTMqc53oLw2g0ayRYdvjRpPfU253HDpeZmOIHAioKGFZLrCbcudqt7O6aLp7//mVK+bDBDds08fSpfopXVNpRA8mo9a5CUfVS5y4KlDNAZqlpM9G6GiMOxUWgTEb6YGhk+o= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=IOUuK1Up; arc=none smtp.client-ip=209.85.160.74 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--irogers.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="IOUuK1Up" Received: by mail-oa1-f74.google.com with SMTP id 586e51a60fabf-2c70bdbbb1bso3943491fac.3 for ; Mon, 24 Mar 2025 15:35:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1742855702; x=1743460502; darn=vger.kernel.org; h=to:from:subject:message-id:references:mime-version:in-reply-to:date :from:to:cc:subject:date:message-id:reply-to; bh=22SmbJgPWD6WV+8wjcChVtc8LFfVPThDvnKhbyYVaoQ=; b=IOUuK1Up9/FB/KKlL/hGxjRX9JLZzFyQ8pOO1cFU5hpwCgxogKqYuQKwob2huvglGU Jb/kNnhvTMRgNMCDieWE5NgXVRCc2ZutzJpI9JR16aqE4A4vi6NNHcLEcDvf8QhxUEsW suNFQ88jSXW6+NKz0d+0oEeNA2e1ZfKaQYqpmuBxFpGtQyvp3F8iI8FCSVjhfmtHICUz tjI7RCK2MqNGun1xwbENZPyr7DY3HzpX9U6Vbw8LnHN1AIXIh82wBk0vPGNjFuL2xUMH A9eI8YgUlgpsdwLFhleZE0xqIVaGcLt8ifDKpMU3FJUYLNllh4bqO2w3BkXhU0JruJhL vHMg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1742855702; x=1743460502; h=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=22SmbJgPWD6WV+8wjcChVtc8LFfVPThDvnKhbyYVaoQ=; b=aYV3QJ2Qpny+TNMzDOiSkulqRWTWLGE+Q/T6j8H6C3hUinpVCOsOzIWCYQLGul4G5P g7kMlGTofijIVw4Y+sgoghAJrtFtVubQDVwpvxmjOZyt9uwoIo1AqYEAw84qL4ynWQNr OcKx7w7pYJMAD85wmPiA0pL//kUp8fPv08Di78fHm+AnKD4pGW6rGxYItfG0JIAO5Ko3 FvO5//R68Pnz0d+VY5YO5MrbGCxcR6PUoErvIhkiwWWA6qtpa+vAprpEzYl/nyxnenVh reJJ8P7B+ZODJcjbB5/CBVSTkC4Q0Pa7E4CipGbXuaAmB4uGcYlH3w15gD6qZxsrtKnC RZ0A== X-Forwarded-Encrypted: i=1; AJvYcCVsCo/QiPNjiF1QM7fQsdEnJqvh12oTp/lJbweX2nPdY6mTsJWh8GDKSk1DLpTNmEh0cDarfcXU3W0vV7Q=@vger.kernel.org X-Gm-Message-State: AOJu0YzK9yLw1GaORFqrL0LOjRpOEiN6U8RzQHwWEUhelMQ9b2l1805w otb/dEL7xywV4qU62kH5M6RcQWrjfpL2u43fMUm2TkW7iChjzJm7RF5xwPiU3mLueysnLRDq05y xGX4Zrw== X-Google-Smtp-Source: AGHT+IFOVJXVRtCGs0SgsEjxtHiADU1/akT31/WAh+aLJp4gwRJS1cn3i/NzT/QM8DFuam9wWbBlVfvwjFds X-Received: from oabpu4.prod.google.com ([2002:a05:6870:9e84:b0:2b8:1fa:4ac5]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6871:2313:b0:2c1:ade0:26a0 with SMTP id 586e51a60fabf-2c7802cfa69mr9471444fac.10.1742855702718; Mon, 24 Mar 2025 15:35:02 -0700 (PDT) Date: Mon, 24 Mar 2025 15:34:41 -0700 In-Reply-To: <20250324223452.208081-1-irogers@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250324223452.208081-1-irogers@google.com> X-Mailer: git-send-email 2.49.0.395.g12beb8f557-goog Message-ID: <20250324223452.208081-4-irogers@google.com> Subject: [PATCH v1 03/14] perf intel-tpebs: Separate evsel__tpebs_prepare out of evsel__tpebs_open From: Ian Rogers To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , Kan Liang , Weilin Wang , James Clark , Xu Yang , John Garry , Howard Chu , Levi Yun , Dominique Martinet , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Separate the creation of the tpebs_retire_lat result out of the opening step. This is in preparation for adding a prepare operation for evlists. Signed-off-by: Ian Rogers --- tools/perf/util/intel-tpebs.c | 133 ++++++++++++++++++++++------------ 1 file changed, 86 insertions(+), 47 deletions(-) diff --git a/tools/perf/util/intel-tpebs.c b/tools/perf/util/intel-tpebs.c index 2b2f4b28e8ef..e218e435c1d7 100644 --- a/tools/perf/util/intel-tpebs.c +++ b/tools/perf/util/intel-tpebs.c @@ -36,7 +36,7 @@ static struct child_process tpebs_cmd; struct tpebs_retire_lat { struct list_head nd; /* Event name */ - const char *name; + char *name; /* Event name with the TPEBS modifier R */ const char *tpebs_name; /* Count of retire_latency values found in sample data */ @@ -189,6 +189,82 @@ static int tpebs_stop(void) return ret; } =20 +static char *evsel__tpebs_name(struct evsel *evsel) +{ + char *name, *modifier; + + name =3D strdup(evsel->name); + if (!name) + return NULL; + + modifier =3D strrchr(name, 'R'); + if (!modifier) { + pr_err("Tpebs event missing modifier '%s'\n", name); + free(name); + return NULL; + } + + *modifier =3D 'p'; + return name; +} + +static struct tpebs_retire_lat *tpebs_retire_lat__new(struct evsel *evsel) +{ + struct tpebs_retire_lat *result =3D zalloc(sizeof(*result)); + + if (!result) + return NULL; + + result->tpebs_name =3D evsel->name; + result->name =3D evsel__tpebs_name(evsel); + if (!result->name) { + free(result); + return NULL; + } + list_add_tail(&result->nd, &tpebs_results); + tpebs_event_size++; + return result; +} + +/** + * evsel__tpebs_prepare - create tpebs data structures ready for opening. + * @evsel: retire_latency evsel, all evsels on its list will be prepared. + */ +static int evsel__tpebs_prepare(struct evsel *evsel) +{ + struct evsel *pos; + struct tpebs_retire_lat *tpebs_event; + + list_for_each_entry(tpebs_event, &tpebs_results, nd) { + if (!strcmp(tpebs_event->tpebs_name, evsel->name)) { + /* + * evsel, or an identically named one, was already + * prepared. + */ + return 0; + } + } + tpebs_event =3D tpebs_retire_lat__new(evsel); + if (!tpebs_event) + return -ENOMEM; + + /* + * Eagerly prepare all other evsels on the list to try to ensure that by + * open they are all known. + */ + evlist__for_each_entry(evsel->evlist, pos) { + int ret; + + if (pos =3D=3D evsel || !pos->retire_lat) + continue; + + ret =3D evsel__tpebs_prepare(pos); + if (ret) + return ret; + } + return 0; +} + /** * evsel__tpebs_open - starts tpebs execution. * @evsel: retire_latency evsel, all evsels on its list will be selected. = Each @@ -196,10 +272,7 @@ static int tpebs_stop(void) */ int evsel__tpebs_open(struct evsel *evsel) { - int ret =3D 0; - struct evsel *pos; - struct evlist *evsel_list =3D evsel->evlist; - char cpumap_buf[50]; + int ret; =20 /* * We should only run tpebs_start when tpebs_recording is enabled. @@ -208,49 +281,13 @@ int evsel__tpebs_open(struct evsel *evsel) if (tpebs_cmd.pid !=3D 0 || !tpebs_recording) return 0; =20 - cpu_map__snprint(evsel_list->core.user_requested_cpus, cpumap_buf, sizeof= (cpumap_buf)); - /* - * Prepare perf record for sampling event retire_latency before fork and - * prepare workload - */ - evlist__for_each_entry(evsel_list, pos) { - int i; - char *name; - struct tpebs_retire_lat *new; - - if (!pos->retire_lat) - continue; - - pr_debug("tpebs: Retire_latency of event %s is required\n", pos->name); - for (i =3D strlen(pos->name) - 1; i > 0; i--) { - if (pos->name[i] =3D=3D 'R') - break; - } - if (i <=3D 0 || pos->name[i] !=3D 'R') { - ret =3D -1; - goto err; - } - - name =3D strdup(pos->name); - if (!name) { - ret =3D -ENOMEM; - goto err; - } - name[i] =3D 'p'; - - new =3D zalloc(sizeof(*new)); - if (!new) { - ret =3D -1; - zfree(&name); - goto err; - } - new->name =3D name; - new->tpebs_name =3D pos->name; - list_add_tail(&new->nd, &tpebs_results); - tpebs_event_size +=3D 1; - } + ret =3D evsel__tpebs_prepare(evsel); + if (ret) + return ret; =20 if (tpebs_event_size > 0) { + struct evlist *evsel_list =3D evsel->evlist; + char cpumap_buf[50]; struct pollfd pollfd =3D { .events =3D POLLIN, }; int control_fd[2], ack_fd[2], len; char ack_buf[8]; @@ -267,6 +304,9 @@ int evsel__tpebs_open(struct evsel *evsel) goto out; } =20 + cpu_map__snprint(evsel_list->core.user_requested_cpus, cpumap_buf, + sizeof(cpumap_buf)); + ret =3D start_perf_record(control_fd, ack_fd, cpumap_buf); if (ret) goto out; @@ -320,7 +360,6 @@ int evsel__tpebs_open(struct evsel *evsel) close(ack_fd[0]); close(ack_fd[1]); } -err: if (ret) tpebs_delete(); return ret; --=20 2.49.0.395.g12beb8f557-goog