Linus Torvalds b0cb56cbbd 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

2025-03-24 13:39:27 -07:00

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