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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2025-03-24 23:39:27 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2025-03-24 23:39:27 +0300 |
| commit | b0cb56cbbdb4754918c28d6d7c294d56e28a3dd5 (patch) | |
| tree | 0ea5d93e6fb3b90e4af055ded02376f851e8fc4f /include/linux/pid.h | |
| parent | 56e7a8b051512da8e7eb5c5a00dcc8e2065a89bb (diff) | |
| parent | 0a7713ac0d98d02f2c69145754c93715ab07b307 (diff) | |
| download | linux-b0cb56cbbdb4754918c28d6d7c294d56e28a3dd5.tar.xz | |
Merge tag 'kernel-6.15-rc1.tasklist_lock' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
Pull tasklist_lock optimizations from Christian Brauner:
"According to the performance testbots this brings a 23% performance
increase when creating new processes:
- Reduce tasklist_lock hold time on exit:
- Perform add_device_randomness() without tasklist_lock
- Perform free_pid() calls outside of tasklist_lock
- Drop irq disablement around pidmap_lock
- Add some tasklist_lock asserts
- Call flush_sigqueue() lockless by changing release_task()
- Don't pointlessly clear TIF_SIGPENDING in __exit_signal() ->
clear_tsk_thread_flag()"
* tag 'kernel-6.15-rc1.tasklist_lock' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
pid: drop irq disablement around pidmap_lock
pid: perform free_pid() calls outside of tasklist_lock
pid: sprinkle tasklist_lock asserts
exit: hoist get_pid() in release_task() outside of tasklist_lock
exit: perform add_device_randomness() without tasklist_lock
exit: kill the pointless __exit_signal()->clear_tsk_thread_flag(TIF_SIGPENDING)
exit: change the release_task() paths to call flush_sigqueue() lockless
Diffstat (limited to 'include/linux/pid.h')
| -rw-r--r-- | include/linux/pid.h | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/include/linux/pid.h b/include/linux/pid.h index 98837a1ff0f3..311ecebd7d56 100644 --- a/include/linux/pid.h +++ b/include/linux/pid.h @@ -101,9 +101,9 @@ extern struct pid *get_task_pid(struct task_struct *task, enum pid_type type); * these helpers must be called with the tasklist_lock write-held. */ extern void attach_pid(struct task_struct *task, enum pid_type); -extern void detach_pid(struct task_struct *task, enum pid_type); -extern void change_pid(struct task_struct *task, enum pid_type, - struct pid *pid); +void detach_pid(struct pid **pids, struct task_struct *task, enum pid_type); +void change_pid(struct pid **pids, struct task_struct *task, enum pid_type, + struct pid *pid); extern void exchange_tids(struct task_struct *task, struct task_struct *old); extern void transfer_pid(struct task_struct *old, struct task_struct *new, enum pid_type); @@ -129,6 +129,7 @@ extern struct pid *find_ge_pid(int nr, struct pid_namespace *); extern struct pid *alloc_pid(struct pid_namespace *ns, pid_t *set_tid, size_t set_tid_size); extern void free_pid(struct pid *pid); +void free_pids(struct pid **pids); extern void disable_pid_allocation(struct pid_namespace *ns); /* |