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| author | Tony Luck <tony.luck@intel.com> | 2017-09-25 16:39:35 -0700 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2017-09-27 12:10:10 +0200 |
| commit | 29e74f35b2fed0ca3e8b31db157e1d183e9d0819 (patch) | |
| tree | 8a618a93b8a53d9c07506b4cba9ac1bac2d9e852 /arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | |
| parent | c377dcfbee808efdb66cf1bb6b9f06fa26b2ad0a (diff) | |
| download | linux-29e74f35b2fed0ca3e8b31db157e1d183e9d0819.tar.gz | |
x86/intel_rdt: Add diagnostics when writing the tasks file
About the only tricky case is trying to move a task into a monitor
group that is a subdirectory of a different control group. But cover
the simple cases too.
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Vikas Shivappa <vikas.shivappa@intel.com>
Cc: Boris Petkov <bp@suse.de>
Cc: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lkml.kernel.org/r/f1841cce6a242aed37cb926dee8942727331bf78.1506382469.git.tony.luck@intel.com
Diffstat (limited to 'arch/x86/kernel/cpu/intel_rdt_rdtgroup.c')
| -rw-r--r-- | arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c index 68103513130b..d39092eb63bb 100644 --- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c +++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c @@ -478,6 +478,7 @@ static int __rdtgroup_move_task(struct task_struct *tsk, */ atomic_dec(&rdtgrp->waitcount); kfree(callback); + rdt_last_cmd_puts("task exited\n"); } else { /* * For ctrl_mon groups move both closid and rmid. @@ -488,10 +489,12 @@ static int __rdtgroup_move_task(struct task_struct *tsk, tsk->closid = rdtgrp->closid; tsk->rmid = rdtgrp->mon.rmid; } else if (rdtgrp->type == RDTMON_GROUP) { - if (rdtgrp->mon.parent->closid == tsk->closid) + if (rdtgrp->mon.parent->closid == tsk->closid) { tsk->rmid = rdtgrp->mon.rmid; - else + } else { + rdt_last_cmd_puts("Can't move task to different control group\n"); ret = -EINVAL; + } } } return ret; @@ -510,8 +513,10 @@ static int rdtgroup_task_write_permission(struct task_struct *task, */ if (!uid_eq(cred->euid, GLOBAL_ROOT_UID) && !uid_eq(cred->euid, tcred->uid) && - !uid_eq(cred->euid, tcred->suid)) + !uid_eq(cred->euid, tcred->suid)) { + rdt_last_cmd_printf("No permission to move task %d\n", task->pid); ret = -EPERM; + } put_cred(tcred); return ret; @@ -528,6 +533,7 @@ static int rdtgroup_move_task(pid_t pid, struct rdtgroup *rdtgrp, tsk = find_task_by_vpid(pid); if (!tsk) { rcu_read_unlock(); + rdt_last_cmd_printf("No task %d\n", pid); return -ESRCH; } } else { @@ -555,6 +561,7 @@ static ssize_t rdtgroup_tasks_write(struct kernfs_open_file *of, if (kstrtoint(strstrip(buf), 0, &pid) || pid < 0) return -EINVAL; rdtgrp = rdtgroup_kn_lock_live(of->kn); + rdt_last_cmd_clear(); if (rdtgrp) ret = rdtgroup_move_task(pid, rdtgrp, of); |