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Wed, 15 Jun 2022 16:08:30 +0000 Received: from VE1PR08MB4989.eurprd08.prod.outlook.com ([fe80::5f7:6dd:4715:5169]) by VE1PR08MB4989.eurprd08.prod.outlook.com ([fe80::5f7:6dd:4715:5169%6]) with mapi id 15.20.5332.022; Wed, 15 Jun 2022 16:08:29 +0000 From: Pavel Tikhomirov To: linux-kernel@vger.kernel.org Cc: Pavel Tikhomirov , Alexander Mikhalitsyn , Eric Biederman , Kees Cook , Alexander Viro , Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Valentin Schneider , Andrew Morton , linux-ia64@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, kernel@openvz.org Subject: [PATCH v2 0/2] Introduce CABA helper process tree Date: Wed, 15 Jun 2022 19:08:17 +0300 Message-Id: <20220615160819.242520-1-ptikhomirov@virtuozzo.com> X-Mailer: git-send-email 2.35.3 X-ClientProxiedBy: AM6PR02CA0032.eurprd02.prod.outlook.com (2603:10a6:20b:6e::45) To VE1PR08MB4989.eurprd08.prod.outlook.com (2603:10a6:803:114::19) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 50ccedb2-774b-4da0-391d-08da4ee949a4 X-MS-TrafficTypeDiagnostic: AM0PR08MB4340:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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b=MThjHYDYbl8gLepUOJogQp5gQg00aQigX1rJkpiV4X7f2kEveN7gyqGqTM2M07EQ4SbKyS msuEGjTTdCQejGz/n0t7jKmYihNwrI8Kp+zULdb9JXvD8k0p4hcp2fzJ/KA44FNGV+V7MQ RA6mqiRbnqgh357aGa7r/OkFewB2Q9U= X-Stat-Signature: 68iur797ybc68mdxfqrhydwpbi9mq3wd X-Rspamd-Queue-Id: 4355E8007E Authentication-Results: imf30.hostedemail.com; dkim=pass header.d=virtuozzo.com header.s=selector2 header.b=SbkG9pIa; arc=pass ("microsoft.com:s=arcselector9901:i=1"); spf=pass (imf30.hostedemail.com: domain of ptikhomirov@virtuozzo.com designates 40.107.2.90 as permitted sender) smtp.mailfrom=ptikhomirov@virtuozzo.com; dmarc=pass (policy=quarantine) header.from=virtuozzo.com X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1655309319-383103 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: Please see "Add CABA tree to task_struct" for deeper explanation, and "tests: Add CABA selftest" for a small test and an actual case for which we might need CABA. Probably the original problem of restoring process tree with complex sessions can be resolved by allowing sessions copying, like we do for process group, but I'm not sure if that would be too secure to do it, and if there would not be another similar resource in future. We can use CABA not only for CRIU for restoring processes, in normal life when processes detach CABA will help to understand from which place in process tree they were originally started from sshd/crond or something else. Hope my idea is not completely insane =) CC: Eric Biederman CC: Kees Cook CC: Alexander Viro CC: Ingo Molnar CC: Peter Zijlstra CC: Juri Lelli CC: Vincent Guittot CC: Dietmar Eggemann CC: Steven Rostedt CC: Ben Segall CC: Mel Gorman CC: Daniel Bristot de Oliveira CC: Valentin Schneider CC: Andrew Morton CC: linux-ia64@vger.kernel.org CC: linux-kernel@vger.kernel.org CC: linux-mm@kvack.org CC: linux-fsdevel@vger.kernel.org CC: kernel@openvz.org Pavel Tikhomirov (2): Add CABA tree to task_struct tests: Add CABA selftest arch/ia64/kernel/mca.c | 3 + fs/exec.c | 1 + fs/proc/array.c | 20 + include/linux/sched.h | 7 + init/init_task.c | 3 + kernel/exit.c | 50 ++- kernel/fork.c | 4 + tools/testing/selftests/Makefile | 1 + tools/testing/selftests/caba/.gitignore | 1 + tools/testing/selftests/caba/Makefile | 7 + tools/testing/selftests/caba/caba_test.c | 501 +++++++++++++++++++++++ tools/testing/selftests/caba/config | 1 + 12 files changed, 593 insertions(+), 6 deletions(-) create mode 100644 tools/testing/selftests/caba/.gitignore create mode 100644 tools/testing/selftests/caba/Makefile create mode 100644 tools/testing/selftests/caba/caba_test.c create mode 100644 tools/testing/selftests/caba/config