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dc433797c6
When writing a pid to file "tasks", a callback function move_myself() is queued to this task to be called when the task returns from kernel mode or exits. The purpose of move_myself() is to activate the newly assigned closid and/or rmid associated with this task. This activation is done by calling resctrl_sched_in() from move_myself(), the same function that is called when switching to this task. If this work is successfully queued but then the task enters PF_EXITING status (e.g., receiving signal SIGKILL, SIGTERM) prior to the execution of the callback move_myself(), move_myself() still calls resctrl_sched_in() since the task status is not currently considered. When a task is exiting, the data structure of the task itself will be freed soon. Calling resctrl_sched_in() to write the register that controls the task's resources is unnecessary and it implies extra performance overhead. Add check on task status in move_myself() and return immediately if the task is PF_EXITING. [ bp: Massage. ] Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Reinette Chatre <reinette.chatre@intel.com> Link: https://lkml.kernel.org/r/1578500026-21152-1-git-send-email-xiaochen.shen@intel.com |
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| .. | ||
| core.c | ||
| ctrlmondata.c | ||
| internal.h | ||
| Makefile | ||
| monitor.c | ||
| pseudo_lock_event.h | ||
| pseudo_lock.c | ||
| rdtgroup.c | ||