diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2025-12-15 17:52:15 +0100 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2026-01-22 11:11:17 +0100 |
| commit | 99d2592023e5d0a31f5f5a83c694df48239a1e6c (patch) | |
| tree | f58a294e6f752c04fdf00f9d6c7360380722d4d4 /include/linux | |
| parent | 28621ec2d46c6adf7d33a6facbd83e2fa566bd34 (diff) | |
rseq: Implement sys_rseq_slice_yield()
Provide a new syscall which has the only purpose to yield the CPU after the
kernel granted a time slice extension.
sched_yield() is not suitable for that because it unconditionally
schedules, but the end of the time slice extension is not required to
schedule when the task was already preempted. This also allows to have a
strict check for termination to catch user space invoking random syscalls
including sched_yield() from a time slice extension region.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://patch.msgid.link/20251215155708.929634896@linutronix.de
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/rseq_types.h | 2 | ||||
| -rw-r--r-- | include/linux/syscalls.h | 1 |
2 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/rseq_types.h b/include/linux/rseq_types.h index 67e40c059b1b..8c540e775161 100644 --- a/include/linux/rseq_types.h +++ b/include/linux/rseq_types.h @@ -89,9 +89,11 @@ union rseq_slice_state { /** * struct rseq_slice - Status information for rseq time slice extension * @state: Time slice extension state + * @yielded: Indicator for rseq_slice_yield() */ struct rseq_slice { union rseq_slice_state state; + u8 yielded; }; /** diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h index cf84d98964b2..6c8a570cf44a 100644 --- a/include/linux/syscalls.h +++ b/include/linux/syscalls.h @@ -961,6 +961,7 @@ asmlinkage long sys_statx(int dfd, const char __user *path, unsigned flags, unsigned mask, struct statx __user *buffer); asmlinkage long sys_rseq(struct rseq __user *rseq, uint32_t rseq_len, int flags, uint32_t sig); +asmlinkage long sys_rseq_slice_yield(void); asmlinkage long sys_open_tree(int dfd, const char __user *path, unsigned flags); asmlinkage long sys_open_tree_attr(int dfd, const char __user *path, unsigned flags, |