Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Yicong Yang <yangyicong@huawei.com>
To:     <mathieu.poirier@linaro.org>, <suzuki.poulose@arm.com>,
        <jonathan.cameron@huawei.com>, <corbet@lwn.net>,
        <linux-kernel@vger.kernel.org>, <linux-doc@vger.kernel.org>
CC:     <alexander.shishkin@linux.intel.com>, <helgaas@kernel.org>,
        <linux-pci@vger.kernel.org>, <prime.zeng@huawei.com>,
        <linuxarm@huawei.com>, <yangyicong@hisilicon.com>
Subject: [PATCH v4 4/5] hwtracing: hisi_ptt: Advertise PERF_PMU_CAP_NO_EXCLUDE for PTT PMU
Date:   Tue, 6 Jun 2023 22:22:43 +0800
Message-ID: <20230606142244.10939-5-yangyicong@huawei.com>
In-Reply-To: <20230606142244.10939-1-yangyicong@huawei.com>
References: <20230606142244.10939-1-yangyicong@huawei.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 7BIT
Content-Type:   text/plain; charset=US-ASCII
Precedence: bulk

From: Yicong Yang <yangyicong@hisilicon.com>

The PTT trace collects PCIe TLP headers from the PCIe link and don't
have the ability to exclude certain context. It doesn't support itrace
as well. So only advertise PERF_PMU_CAP_NO_EXCLUDE. This will greatly
save the storage of final data. Tested tracing idle link for ~15s,
without this patch we'll collect ~28.682MB data for context related
information and with this patch it reduced to ~0.226MB.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
---
 drivers/hwtracing/ptt/hisi_ptt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwtracing/ptt/hisi_ptt.c b/drivers/hwtracing/ptt/hisi_ptt.c
index 5c7e93e7705f..ff2c16efe5b1 100644
--- a/drivers/hwtracing/ptt/hisi_ptt.c
+++ b/drivers/hwtracing/ptt/hisi_ptt.c
@@ -1210,7 +1210,7 @@ static int hisi_ptt_register_pmu(struct hisi_ptt *hisi_ptt)
 
 	hisi_ptt->hisi_ptt_pmu = (struct pmu) {
 		.module		= THIS_MODULE,
-		.capabilities	= PERF_PMU_CAP_EXCLUSIVE | PERF_PMU_CAP_ITRACE,
+		.capabilities	= PERF_PMU_CAP_NO_EXCLUDE,
 		.task_ctx_nr	= perf_sw_context,
 		.attr_groups	= hisi_ptt_pmu_groups,
 		.event_init	= hisi_ptt_pmu_event_init,
-- 
2.24.0