Re: Task watchers v2
Matt wrote:
Previous iterations of task watchers would prevent the code in these
paths from being inlined. Furthermore, the code certainly wouldn't be
placed near the table of function pointers (which was in an entirely
different ELF section). By placing them adjacent to each other in the
same ELF section we can improve the likelihood of cache hits in
fork-heavy workloads (which were the ones that showed a performance
decrease in the previous iteration of these patches).
Ah so - by marking some of the fork (and exit, exec, ...) routines
with the WATCH_TASK_* mechanism, you can compact them together in the
kernel's text pages, instead of having them scattered about based on
whatever source files they are in.
Nice.
--
I won't rest till it's the best ...
Programmer, Linux Scalability
Paul Jackson <pj(a)sgi.com> 1.925.600.0401