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[2003:cb:c739:5b00:84f2:50f3:bdc8:d500]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-390e4844892sm22239947f8f.64.2025.03.05.12.53.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 05 Mar 2025 12:53:22 -0800 (PST) Message-ID: Date: Wed, 5 Mar 2025 21:53:20 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH -next v1 0/3] kernel/events/uprobes: uprobe_write_opcode() rewrite To: Andrii Nakryiko Cc: Oleg Nesterov , Andrii Nakryiko , Jiri Olsa , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-trace-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Andrew Morton , Matthew Wilcox , Russell King , Masami Hiramatsu , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Ian Rogers , Adrian Hunter , "Liang, Kan" , Tong Tiangen References: <20250304154846.1937958-1-david@redhat.com> <20250305152055.GB28112@redhat.com> <62f93f79-a8d4-44a5-b276-3ac5af4ab25c@redhat.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 74E65C0013 X-Stat-Signature: bbe75bf64q81k3u58jnh6snp7hz7gwo5 X-HE-Tag: 1741208019-551519 X-HE-Meta: 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 n3Kzx691 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 05.03.25 20:58, Andrii Nakryiko wrote: > On Wed, Mar 5, 2025 at 11:47 AM David Hildenbrand wrote: >> >> On 05.03.25 20:43, Andrii Nakryiko wrote: >>> On Wed, Mar 5, 2025 at 7:22 AM Oleg Nesterov wrote: >>>> >>>> On 03/04, David Hildenbrand wrote: >>>>> >>>>> Currently, uprobe_write_opcode() implements COW-breaking manually, which is >>>>> really far from ideal. >>>> >>>> To say at least ;) >>>> >>>> David, thanks for doing this. I'll try to read 3/3 tomorrow, but I don't >>>> think I can really help. Let me repeat, this code was written many years >>>> ago, I forgot everything, and today my understanding of mm/ is very poor. >>>> But I'll try anyway. >>>> >>>>> Are there any uprobe tests / benchmarks that are worth running? >>>> >>>> All I know about uprobe tests is that bpf people run a lot of tests which >>>> use uprobes. >>>> >>>> Andrii, Jiri, what you advise? >>>> >>> >>> We do have a bunch of tests within BPF selftests: >>> >>> cd tools/testing/selftest/bpf && make -j$(nproc) && sudo ./test_progs -t uprobe >> >> I stumbled over them, but was so far not successful in building them in >> my test VM (did not try too hard, though). Will try harder now that I >> know that it actually tests uprobe properly :) > > If you have decently recent Clang and pahole, then just make sure you > have kernel built before you build selftests. So above instructions > are more like: > > 1. cd > 2. cat tools/testing/selftests/bpf/{config, config.} >> .config ^ that did the trick > 3. make -j$(nproc) # build kernel with that adjusted config > 4. cd tools/testing/selftests/bpf > 5. make -j$(nproc) # build BPF selftests > 6. sudo ./test_progs -t uprobe # run selftests with "uprobe" in their name #444 uprobe:OK #445 uprobe_autoattach:OK #446/1 uprobe_multi_test/skel_api:OK #446/2 uprobe_multi_test/attach_api_pattern:OK #446/3 uprobe_multi_test/attach_api_syms:OK #446/4 uprobe_multi_test/link_api:OK #446/5 uprobe_multi_test/bench_uprobe:OK #446/6 uprobe_multi_test/bench_usdt:OK #446/7 uprobe_multi_test/attach_api_fails:OK #446/8 uprobe_multi_test/attach_uprobe_fails:OK #446/9 uprobe_multi_test/consumers:OK #446/10 uprobe_multi_test/filter_fork:OK #446/11 uprobe_multi_test/filter_clone_vm:OK #446/12 uprobe_multi_test/session:OK #446/13 uprobe_multi_test/session_single:OK #446/14 uprobe_multi_test/session_cookie:OK #446/15 uprobe_multi_test/session_cookie_recursive:OK #446/16 uprobe_multi_test/uprobe_sesison_return_0:OK #446/17 uprobe_multi_test/uprobe_sesison_return_1:OK #446/18 uprobe_multi_test/uprobe_sesison_return_2:OK #446 uprobe_multi_test:OK #447/1 uprobe_syscall/uretprobe_regs_equal:OK #447/2 uprobe_syscall/uretprobe_regs_change:OK #447/3 uprobe_syscall/uretprobe_syscall_call:OK #447/4 uprobe_syscall/uretprobe_shadow_stack:SKIP #447 uprobe_syscall:OK (SKIP: 1/4) Summary: 4/21 PASSED, 1 SKIPPED, 0 FAILED Looks promising, thanks! -- Cheers, David / dhildenb