Include performance and multi-CPU scalability of uretprobes by avoiding
a rather expensive (and somewhat limiting in terms of multi-CPU scalability)
use of kmalloc()+kfree() combo for short-lived struct return_instance, used
for keeping track of pending return uprobes.

First few patches are preparatory doing some internal refactoring and setting
things up for the actual struct return_instance reuse done in the last patch
of the series.

Andrii Nakryiko (4):
  uprobes: simplify session consumer tracking
  uprobes: decouple return_instance list traversal and freeing
  uprobes: ensure return_instance is detached from the list before
    freeing
  uprobes: reuse return_instances between multiple uretprobes within
    task

 include/linux/uprobes.h |  16 +++-
 kernel/events/uprobes.c | 176 +++++++++++++++++++++++++++-------------
 2 files changed, 133 insertions(+), 59 deletions(-)

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2.43.5