tracehook: wait_task_inactive
authorRoland McGrath <roland@redhat.com>
Sat, 26 Jul 2008 02:45:58 +0000 (19:45 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Sat, 26 Jul 2008 19:00:09 +0000 (12:00 -0700)
commit85ba2d862e521375a8ee01526c5c46b1f24bb4af
treef098555cb580b2864f145aa845b574f07d2cf694
parent1f5a4ad97a0e7b663d527ecc02aabe203d000d91
tracehook: wait_task_inactive

This extends wait_task_inactive() with a new argument so it can be used in
a "soft" mode where it will check for the task changing state unexpectedly
and back off.  There is no change to existing callers.  This lays the
groundwork to allow robust, noninvasive tracing that can try to sample a
blocked thread but back off safely if it wakes up.

Signed-off-by: Roland McGrath <roland@redhat.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Reviewed-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
arch/ia64/kernel/perfmon.c
include/linux/sched.h
kernel/kthread.c
kernel/ptrace.c
kernel/sched.c