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Fri, 15 Sep 2023 17:42:35 -0500 From: Babu Moger To: , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v10 01/10] x86/resctrl: Add multiple tasks to the resctrl group at once Date: Fri, 15 Sep 2023 17:42:18 -0500 Message-ID: <20230915224227.1336967-2-babu.moger@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230915224227.1336967-1-babu.moger@amd.com> References: <20230915224227.1336967-1-babu.moger@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000E9CD:EE_|DM6PR12MB4563:EE_ X-MS-Office365-Filtering-Correlation-Id: 2348c6bf-3e18-41c4-9b2c-08dbb63d0fd9 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230031)(4636009)(396003)(346002)(136003)(39860400002)(376002)(82310400011)(186009)(451199024)(1800799009)(40470700004)(36840700001)(46966006)(26005)(5660300002)(16526019)(8936002)(1076003)(8676002)(4326008)(40460700003)(66899024)(36756003)(2906002)(83380400001)(7406005)(7416002)(86362001)(82740400003)(81166007)(356005)(36860700001)(47076005)(336012)(426003)(44832011)(40480700001)(7696005)(6666004)(2616005)(110136005)(54906003)(70586007)(70206006)(478600001)(41300700001)(316002)(36900700001);DIR:OUT;SFP:1101; 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Fri, 15 Sep 2023 15:43:50 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1777187661651937294 X-GMAIL-MSGID: 1777187661651937294 The resctrl task assignment for monitor or control group needs to be done one at a time. For example: $mount -t resctrl resctrl /sys/fs/resctrl/ $mkdir /sys/fs/resctrl/ctrl_grp1 $echo 123 > /sys/fs/resctrl/ctrl_grp1/tasks $echo 456 > /sys/fs/resctrl/ctrl_grp1/tasks $echo 789 > /sys/fs/resctrl/ctrl_grp1/tasks This is not user-friendly when dealing with hundreds of tasks. Support multiple task assignment in one command with tasks ids separated by commas. For example: $echo 123,456,789 > /sys/fs/resctrl/ctrl_grp1/tasks Reviewed-by: Tan Shaopeng Tested-by: Tan Shaopeng Reviewed-by: Reinette Chatre Reviewed-by: Fenghua Yu Signed-off-by: Babu Moger Signed-off-by: Babu Moger Tested-by: Tan Shaopeng Reviewed-by: Tan Shaopeng Reviewed-by: Fenghua Yu Reviewed-by: Reinette Chatre Reviewed-by: Ilpo Järvinen --- Documentation/arch/x86/resctrl.rst | 9 ++++++++- arch/x86/kernel/cpu/resctrl/rdtgroup.c | 25 ++++++++++++++++++++++--- 2 files changed, 30 insertions(+), 4 deletions(-) diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst index cb05d90111b4..8154e9975d1e 100644 --- a/Documentation/arch/x86/resctrl.rst +++ b/Documentation/arch/x86/resctrl.rst @@ -299,7 +299,14 @@ All groups contain the following files: "tasks": Reading this file shows the list of all tasks that belong to this group. Writing a task id to the file will add a task to the - group. If the group is a CTRL_MON group the task is removed from + group. Multiple tasks can be added by separating the task ids + with commas. Tasks will be assigned sequentially. Multiple + failures are not supported. A single failure encountered while + attempting to assign a task will cause the operation to abort and + already added tasks before the failure will remain in the group. + Failures will be logged to /sys/fs/resctrl/info/last_cmd_status. + + If the group is a CTRL_MON group the task is removed from whichever previous CTRL_MON group owned the task and also from any MON group that owned the task. If the group is a MON group, then the task must already belong to the CTRL_MON parent of this diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c index 725344048f85..f0d163950969 100644 --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c @@ -696,11 +696,10 @@ static ssize_t rdtgroup_tasks_write(struct kernfs_open_file *of, char *buf, size_t nbytes, loff_t off) { struct rdtgroup *rdtgrp; + char *pid_str; int ret = 0; pid_t pid; - if (kstrtoint(strstrip(buf), 0, &pid) || pid < 0) - return -EINVAL; rdtgrp = rdtgroup_kn_lock_live(of->kn); if (!rdtgrp) { rdtgroup_kn_unlock(of->kn); @@ -715,7 +714,27 @@ static ssize_t rdtgroup_tasks_write(struct kernfs_open_file *of, goto unlock; } - ret = rdtgroup_move_task(pid, rdtgrp, of); + while (buf && buf[0] != '\0' && buf[0] != '\n') { + pid_str = strim(strsep(&buf, ",")); + + if (kstrtoint(pid_str, 0, &pid)) { + rdt_last_cmd_printf("Task list parsing error pid %s\n", pid_str); + ret = -EINVAL; + break; + } + + if (pid < 0) { + rdt_last_cmd_printf("Invalid pid %d\n", pid); + ret = -EINVAL; + break; + } + + ret = rdtgroup_move_task(pid, rdtgrp, of); + if (ret) { + rdt_last_cmd_printf("Error while processing task %d\n", pid); + break; + } + } unlock: rdtgroup_kn_unlock(of->kn);