cvs commit: src/sys/sys proc.h umtx.h src/sys/kern kern_thread.c kern_umtx.c

[Alexey Dokuchaev]

On Sat, Mar 05, 2005 at 09:15:03AM +0000, David Xu wrote:
> davidxu     2005-03-05 09:15:03 UTC
> 
>   FreeBSD src repository
> 
>   Modified files:
>     sys/sys              proc.h umtx.h 
>     sys/kern             kern_thread.c kern_umtx.c 
>   Log:
>   Allocate umtx_q from heap instead of stack, this avoids
>   page fault panic in kernel under heavy swapping.

So..  Slow malloc/free path at last.  As a side note, could someone (not
necessarily David) comment on my impression that, for example, recently
reported not-so-optimal performance of our threading model(s) is largely due
to heavy use of malloc/free, as opposed to other operating systems out
there?  Am I right thinking that this is main bottleneck?  If malloc'ing is
so costly, why we're taking this path?  Can kernel malloc() be optimized?

Thanks.

./danfe