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[2003:cb:c708:9d00:edd9:835b:4bfb:2ce3]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-38a1c8ace0esm3569887f8f.106.2024.12.20.01.56.51 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 20 Dec 2024 01:56:52 -0800 (PST) Message-ID: <860a1ef0-678d-414d-8511-9695b90c3ca0@redhat.com> Date: Fri, 20 Dec 2024 10:56:50 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3] perf: map pages in advance To: Lorenzo Stoakes , "Chen, Zide" Cc: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , Kan Liang , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Matthew Wilcox , Yi Lai References: <20241205082948.56212-1-lorenzo.stoakes@oracle.com> <65a04f0d-668b-47b6-a532-d1e11ef4835a@intel.com> <4ded2d63-03dd-498e-9810-690a9eff0c22@lucifer.local> From: David Hildenbrand Content-Language: en-US Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 20.12.24 10:31, Lorenzo Stoakes wrote: > On Thu, Dec 19, 2024 at 01:17:44PM -0800, Chen, Zide wrote: > >> With this patch, it seems perf tool has some problems in capturing the >> kernel data with Intel PT. >> >> Running the following commands, the size of perf.data is very small, and >> perf script can't find any valid records. >> >> perf record -e intel_pt//u -- /bin/ls >> perf script --insn-trace >> >> > > Hi, > > I'm on leave (and should really go back to relaxing :>), returning on 2nd > Jan so can't really dig into this. > > But I tried it on my intel box and it 'works on my machine' with and > without patch with commands provided, so I'm not sure this is actually a > product of this change (which shouldn't impact this). Zide Chen, can you try with and without this patch to see if it introduces the issue? -- Cheers, David / dhildenb