While reviewing RCU's interruptible swaits I noticed signals were actually not expected. Paul explained that the reason signals are not expected is we use kthreads, which don't get signals, furthermore the code avoided the uninterruptible swaits as otherwise it would contribute to the system load average on idle, bumping it from 0 to 2 or 3 (depending on preemption).
Since this can be confusing its best to be explicit about the requirements and goals. This patch depends on the other killable swaits [0] recently proposed as well interms of context. Thee patch can however be tested independently if the hunk is addressed separately. [0] https://lkml.kernel.org/r/[email protected] Luis R. Rodriguez (2): swait: add idle variants which don't contribute to load average rcu: use idle versions of swait to make idle-hack clear include/linux/swait.h | 25 +++++++++++++++++++++++++ kernel/rcu/tree.c | 4 ++-- 2 files changed, 27 insertions(+), 2 deletions(-) -- 2.11.0
