On Nov 24, 2010, at 4:05 PM, Andres Freund <andres@anarazel.de> wrote:
>>>
>>> Won't this just cause loads of additional pagefaults after fork() when
>>> those pages are used the first time and then a second time when first
>>> written to (to copy it)?
>>
>> Aren't we incurring those page faults anyway, for whatever memory
>> palloc is handing out? The heap is no different from bss; we just
>> move the pointer with sbrk().
> Yes, but only once. Also scrubbing a page is faster than copying it... (and
> there were patches floating around to do that in advance, not sure if they got
> integrated into mainline linux)
I'm not following - can you elaborate?
...Robert