Ingo Molnar <[email protected]> writes:
> * Eric W. Biederman <[email protected]> wrote:
>
>> > so ... is anyone pursuing this? This would allow us to make
>> > sys_wait4() faster and more scalable: no tasklist_lock bouncing for
>> > example.
>>
>> which part?
>
> all of it :) Everything you mentioned makes sense quite a bit. The
> thread signal handling of do_wait was added in a pretty arbitrary
> fashion so i doubt there are strong requirements in that area. Apps
> might have grown to get used to it meanwhile though, so we've got to do
> it carefully.
I'm looking at. If only because there is a reasonable chance doing this
will fix the races with a threaded init.
However I just found something nasty. The wait __WNOTHREAD flag.
And my quick search seems to find at least one user space applications
that uses it, and it is widely documented so I suspect there are
others :(
I played with moving the lists into signal_struct, and short of
architecture specific users of task->children all I had to touch
were:
include/linux/init_task.h | 2 +-
include/linux/sched.h | 5 +-
kernel/exit.c | 159 +++++++++++++++++++++------------------------
kernel/fork.c | 2 +-
mm/oom_kill.c | 4 +-
So it should be relatively easy to change this child lists around...
Eric
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]