{"id":13919,"url":"https://patchwork.libcamera.org/api/covers/13919/?format=json","web_url":"https://patchwork.libcamera.org/cover/13919/","project":{"id":1,"url":"https://patchwork.libcamera.org/api/projects/1/?format=json","name":"libcamera","link_name":"libcamera","list_id":"libcamera_core","list_email":"libcamera-devel@lists.libcamera.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20210924102323.26787-1-laurent.pinchart@ideasonboard.com>","date":"2021-09-24T10:23:19","name":"[libcamera-devel,v1,0/4] libcamera: Improve backtraces","submitter":{"id":2,"url":"https://patchwork.libcamera.org/api/people/2/?format=json","name":"Laurent Pinchart","email":"laurent.pinchart@ideasonboard.com"},"mbox":"https://patchwork.libcamera.org/cover/13919/mbox/","series":[{"id":2562,"url":"https://patchwork.libcamera.org/api/series/2562/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=2562","date":"2021-09-24T10:23:19","name":"libcamera: Improve backtraces","version":1,"mbox":"https://patchwork.libcamera.org/series/2562/mbox/"}],"comments":"https://patchwork.libcamera.org/api/covers/13919/comments/","headers":{"Return-Path":"","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 AE871BDC71\n\tfor ;\n\tFri, 24 Sep 2021 10:23:32 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id D56F069193;\n\tFri, 24 Sep 2021 12:23:31 +0200 (CEST)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 27901687DD\n\tfor ;\n\tFri, 24 Sep 2021 12:23:30 +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 A550C45E\n\tfor ;\n\tFri, 24 Sep 2021 12:23:29 +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=\"W5NSPFen\"; dkim-atps=neutral","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1632479009;\n\tbh=iBUElzB6bzNtsj6Nf8RYjdNIvZSJU4MXXgu3/s1FCcs=;\n\th=From:To:Subject:Date:From;\n\tb=W5NSPFenxFOV+6B/TRWtprK5KTAWap/hEL2RWPIo39sudJ+fDK+30hugTT3uvrccW\n\t868AoqHcI0QClxpdDpA5hakZqxyJn7gneXR0UJs8E+K+PzdORwNsrZ/kacIQeNcUHl\n\twVQll5DJjpBFdJ8E+AkkkjwMiSftG+bfcw1+TkRU=","From":"Laurent Pinchart ","To":"libcamera-devel@lists.libcamera.org","Date":"Fri, 24 Sep 2021 13:23:19 +0300","Message-Id":"<20210924102323.26787-1-laurent.pinchart@ideasonboard.com>","X-Mailer":"git-send-email 2.32.0","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","Subject":"[libcamera-devel] [PATCH v1 0/4] libcamera: Improve backtraces","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "},"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\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 | 317 +++++++++++++++++++++++++++++\n src/libcamera/base/log.cpp | 25 +--\n src/libcamera/base/meson.build | 18 ++\n 6 files changed, 380 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: 6942fb11cc01ad7d5484b52963d15861d6ca4f2a"}