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{ "id": 14029, "url": "https://patchwork.libcamera.org/api/1.1/covers/14029/?format=api", "web_url": "https://patchwork.libcamera.org/cover/14029/", "project": { "id": 1, "url": "https://patchwork.libcamera.org/api/1.1/projects/1/?format=api", "name": "libcamera", "link_name": "libcamera", "list_id": "libcamera_core", "list_email": "libcamera-devel@lists.libcamera.org", "web_url": "", "scm_url": "", "webscm_url": "" }, "msgid": "<20211003223606.20016-1-laurent.pinchart@ideasonboard.com>", "date": "2021-10-03T22:36:02", "name": "[libcamera-devel,v2,0/4] libcamera: Improve backtraces", "submitter": { "id": 2, "url": "https://patchwork.libcamera.org/api/1.1/people/2/?format=api", "name": "Laurent Pinchart", "email": "laurent.pinchart@ideasonboard.com" }, "mbox": "https://patchwork.libcamera.org/cover/14029/mbox/", "series": [ { "id": 2593, "url": "https://patchwork.libcamera.org/api/1.1/series/2593/?format=api", "web_url": "https://patchwork.libcamera.org/project/libcamera/list/?series=2593", "date": "2021-10-03T22:36:03", "name": "libcamera: Improve backtraces", "version": 2, "mbox": "https://patchwork.libcamera.org/series/2593/mbox/" } ], "comments": "https://patchwork.libcamera.org/api/covers/14029/comments/", "headers": { "Return-Path": "<libcamera-devel-bounces@lists.libcamera.org>", "X-Original-To": "parsemail@patchwork.libcamera.org", "Delivered-To": "parsemail@patchwork.libcamera.org", "Received": [ "from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id E1AC5C3243\n\tfor <parsemail@patchwork.libcamera.org>;\n\tSun, 3 Oct 2021 22:36:18 +0000 (UTC)", "from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id D71B9691C5;\n\tMon, 4 Oct 2021 00:36:17 +0200 (CEST)", "from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id D19D6691A3\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tMon, 4 Oct 2021 00:36:14 +0200 (CEST)", "from pendragon.lan (62-78-145-57.bb.dnainternet.fi [62.78.145.57])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id 47002A2A\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tMon, 4 Oct 2021 00:36:14 +0200 (CEST)" ], "Authentication-Results": "lancelot.ideasonboard.com;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n\tunprotected) header.d=ideasonboard.com header.i=@ideasonboard.com\n\theader.b=\"Pq7w01En\"; dkim-atps=neutral", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1633300574;\n\tbh=d/gdooZVxOD8zhka53RlTdtP30bihU76kBaKh5L4VBg=;\n\th=From:To:Subject:Date:From;\n\tb=Pq7w01EnHJ/ajWVyZamB/wbNKs70/0+C7AyakLo7oEDyB4bmyiMTMlLQWatpUn//g\n\tIn64JnBz6/aKRRnGxewLR2PsPe/oIls2h/sjLS9p68oCRrXuYcJq9LX41rOQGh6fDX\n\tPmOAWbE2X3P4LBziE6GzB1Iz8TMhBJfwLXhN8/aU=", "From": "Laurent Pinchart <laurent.pinchart@ideasonboard.com>", "To": "libcamera-devel@lists.libcamera.org", "Date": "Mon, 4 Oct 2021 01:36:02 +0300", "Message-Id": "<20211003223606.20016-1-laurent.pinchart@ideasonboard.com>", "X-Mailer": "git-send-email 2.32.0", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Subject": "[libcamera-devel] [PATCH v2 0/4] libcamera: Improve backtraces", "X-BeenThere": "libcamera-devel@lists.libcamera.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "<libcamera-devel.lists.libcamera.org>", "List-Unsubscribe": "<https://lists.libcamera.org/options/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=unsubscribe>", "List-Archive": "<https://lists.libcamera.org/pipermail/libcamera-devel/>", "List-Post": "<mailto:libcamera-devel@lists.libcamera.org>", "List-Help": "<mailto:libcamera-devel-request@lists.libcamera.org?subject=help>", "List-Subscribe": "<https://lists.libcamera.org/listinfo/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=subscribe>", "Errors-To": "libcamera-devel-bounces@lists.libcamera.org", "Sender": "\"libcamera-devel\" <libcamera-devel-bounces@lists.libcamera.org>" }, "content": "Hello,\n\nThis patch series improves backtrace generation. It stems from an effort\nto implement a FileDescriptor leak tracker, and I'm posting it\nseparately because it's useful on its own.\n\nPatch 1/4 extracts the backtrace generation code from the logger to a\nnew Backtrace class. The class allows capturing a backtrace (in a way\nthat is as lightweight as possible), and later formatting it in a\nhuman-readable form (which can be more expensive). Backtrace instances\ncan thus be created relatively frequently and stored for possible later\nusage.\n\nPatches 2/4 to 4/4 then improve the Backtrace class to use libdw and/or\nlibunwind when available. libunwind provides both backtrace capture and\nbacktrace formatting capabilities, while libdw provides the latter only,\nbut with support for more detailed information. In both cases C++ symbol\nnames can now be demangled.\n\nlibdw and libunwind are optional dependencies, they will be used\nautomatically if found.\n\nChanges compared to v1 are minor and listed in individual changelogs.\n\nLaurent Pinchart (4):\n libcamera: base: Add Backtrace class\n libcamera: base: backtrace: Use libdw to provide symbolic names\n libcamera: base: backtrace: Use libunwind when available\n libcamera: base: backtrace: Fallback to libunwind for symbolic names\n\n include/libcamera/base/backtrace.h | 38 ++++\n include/libcamera/base/meson.build | 1 +\n meson.build | 4 -\n src/libcamera/base/backtrace.cpp | 323 +++++++++++++++++++++++++++++\n src/libcamera/base/log.cpp | 27 +--\n src/libcamera/base/meson.build | 18 ++\n 6 files changed, 388 insertions(+), 23 deletions(-)\n create mode 100644 include/libcamera/base/backtrace.h\n create mode 100644 src/libcamera/base/backtrace.cpp\n\n\nbase-commit: d79b41200199e03834578f5120bb8375bad37aec" }