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authorLinus Torvalds <torvalds@linux-foundation.org>2022-03-21 12:37:33 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2022-03-21 12:37:33 -0700
commitbba90e096468a3185649e9ab75873722ae4d6f96 (patch)
tree8e19217216ceeec75f9109de0630131e3c1ca871 /include/linux/sched
parent3fd33273a4675e819544ccbbf8d769e14672666b (diff)
parentbf9ad37dc8a30cce22ae95d6c2ca6abf8731d305 (diff)
Merge tag 'core-core-2022-03-21' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull core process handling RT latency updates from Thomas Gleixner: - Reduce the amount of work to release a task stack in context switch. There is no real reason to do cgroup accounting and memory freeing in this performance sensitive context. Aside of this the invoked functions cannot be called from this preemption disabled context on PREEMPT_RT enabled kernels. Solve this by moving the accounting into do_exit() and delaying the freeing of the stack unless the vmap stack can be cached. - Provide a mechanism to delay raising signals from atomic context on PREEMPT_RT enabled kernels as sighand::lock cannot be acquired. Store the information in the task struct and raise it in the exit path. * tag 'core-core-2022-03-21' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: signal, x86: Delay calling signals in atomic on RT enabled kernels fork: Use IS_ENABLED() in account_kernel_stack() fork: Only cache the VMAP stack in finish_task_switch() fork: Move task stack accounting to do_exit() fork: Move memcg_charge_kernel_stack() into CONFIG_VMAP_STACK fork: Don't assign the stack pointer in dup_task_struct() fork, IA64: Provide alloc_thread_stack_node() for IA64 fork: Duplicate task_struct before stack allocation fork: Redo ifdefs around task stack handling
Diffstat (limited to 'include/linux/sched')
-rw-r--r--include/linux/sched/task_stack.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/sched/task_stack.h b/include/linux/sched/task_stack.h
index d10150587d81..892562ebbd3a 100644
--- a/include/linux/sched/task_stack.h
+++ b/include/linux/sched/task_stack.h
@@ -79,6 +79,8 @@ static inline void *try_get_task_stack(struct task_struct *tsk)
static inline void put_task_stack(struct task_struct *tsk) {}
#endif
+void exit_task_stack_account(struct task_struct *tsk);
+
#define task_stack_end_corrupted(task) \
(*(end_of_stack(task)) != STACK_END_MAGIC)