scottl at samsco.org
Thu Jan 3 15:09:05 PST 2008
On Jan 3, 2008, at 3:46 PM, John Baldwin wrote:
> On Thursday 03 January 2008 05:23:52 pm Scott Long wrote:
>> Dag-Erling Smørgrav wrote:
>>> Jason Evans <jasone at freebsd.org> writes:
>>>> [sbrk is broken]
>>> The real question is why we would revert perfectly good code
>>> from using a modern interface to using one that has been obsolete
>>> twenty years, and marked as such in the man page for seven years.
>>> If rwatson@ wants malloc() to respect resource limits, he can bloody
>>> well fix mmap(). Until he does, the datasize limit is a joke
>>> anyway, as
>>> anyone can circumvent it by either using mmap() instead of
>>> malloc() or
>>> setting _malloc_options before calling malloc().
>> That is a pretty damning argument in my mind. Why make such a major
>> change right before the release when it's effectively useless?
> The motivation for the change is to preserve POLA as malloc() does
> RLIMIT_DATA in previous releases (4.x, 6.x, etc.). That said, I think
> RLIMIT_VMEM is probably more useful going forward. I know at work
> we have
> lots of hacks to deal with maxdsiz and trying to allow apps that use
> malloc() and large mmap both cooperate. Having one resource limit
> for malloc
> + mmap is probably best for the future.
If it were happening on a stable branch, I'd agree more with the POLA
The tradeoff between last minute destabilization, which is exactly
here, and the highly imperfect and antiquated justification, is pretty
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