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GET /api/patches/2195344/?format=api
{ "id": 2195344, "url": "http://patchwork.ozlabs.org/api/patches/2195344/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260210201344.1403613-4-pierrick.bouvier@linaro.org/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/projects/14/?format=api", "name": "QEMU Development", "link_name": "qemu-devel", "list_id": "qemu-devel.nongnu.org", "list_email": "qemu-devel@nongnu.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260210201344.1403613-4-pierrick.bouvier@linaro.org>", "list_archive_url": null, "date": "2026-02-10T20:13:43", "name": "[3/4] docs/about/emulation/uftrace: add info about automatic tracing", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "ea7dc8619ae737364e18ea784c8573d747cdf2ea", "submitter": { "id": 85798, "url": "http://patchwork.ozlabs.org/api/people/85798/?format=api", "name": "Pierrick Bouvier", "email": "pierrick.bouvier@linaro.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260210201344.1403613-4-pierrick.bouvier@linaro.org/mbox/", "series": [ { "id": 491734, "url": "http://patchwork.ozlabs.org/api/series/491734/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=491734", "date": "2026-02-10T20:13:44", "name": "contrib/plugins/uftrace: add riscv64 support", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/491734/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2195344/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2195344/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=a8t6EHFt;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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helo=mail-pg1-x536.google.com", "X-Spam_score_int": "-20", "X-Spam_score": "-2.1", "X-Spam_bar": "--", "X-Spam_report": "(-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=ham autolearn_force=no", "X-Spam_action": "no action", "X-BeenThere": "qemu-devel@nongnu.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "qemu development <qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>\n---\n docs/about/emulation.rst | 13 ++++++++++---\n 1 file changed, 10 insertions(+), 3 deletions(-)", "diff": "diff --git a/docs/about/emulation.rst b/docs/about/emulation.rst\nindex e8793b0f9ce..f547e118eef 100644\n--- a/docs/about/emulation.rst\n+++ b/docs/about/emulation.rst\n@@ -849,7 +849,7 @@ Symbols must be present in ELF binaries.\n It tracks the call stack (based on frame pointer analysis). Thus, your program\n and its dependencies must be compiled using ``-fno-omit-frame-pointer\n -mno-omit-leaf-frame-pointer``. In 2024, `Ubuntu and Fedora enabled it by\n-default again on x64\n+default again on 64-bit platforms\n <https://www.brendangregg.com/blog/2024-03-17/the-return-of-the-frame-pointers.html>`_.\n On aarch64, this is less of a problem, as they are usually part of the ABI,\n except for leaf functions. That's true for user space applications, but not\n@@ -976,7 +976,7 @@ You can follow the exact same instructions for a x64 system, combining edk2,\n Linux, and Ubuntu, simply by switching to\n `x86_64 <https://github.com/pbo-linaro/qemu-linux-stack/tree/x86_64>`_ branch.\n \n-To build the system::\n+To build and run the system::\n \n # Install dependencies\n $ sudo apt install -y podman qemu-user-static\n@@ -988,7 +988,14 @@ To build the system::\n # system can be started using:\n $ ./run.sh /path/to/qemu-system-aarch64\n \n-To generate a uftrace for a system boot from that::\n+ # generate a uftrace for execution (collect symbols automatically)\n+ $ ./trace.sh /path/to/qemu-system-aarch64\n+ # show output log to read timestamps\n+ $ cat uftrace.data/exec.log\n+ # generate final trace (compressed) for perfetto\n+ $ ./perfetto.sh <start_timestamp> <end_timestamp> ~/trace.gz\n+\n+To generate manually the same trace::\n \n # run true and poweroff the system\n $ env INIT=true ./run.sh path/to/qemu-system-aarch64 \\\n", "prefixes": [ "3/4" ] }