svn commit: r355828 - head/sys/sys

[Brooks Davis]

On Tue, Dec 17, 2019 at 01:28:20PM -0500, Pedro Giffuni wrote:
> On 16/12/2019 23:42, Cy Schubert wrote:
> > In message <201912162355.xBGNtUq6078840 at repo.freebsd.org>, "Pedro F.
> > Giffuni" w
> > rites:
> >> Author: pfg
> >> Date: Mon Dec 16 23:55:30 2019
> >> New Revision: 355828
> >> URL: https://svnweb.freebsd.org/changeset/base/355828
> >>
> >> Log:
> >>    Double the size of ARG_MAX on LP64 platforms.
> >>    
> >>    As modern software keeps growing in size, we get requests to update the
> >>    value of ARG_MAX in order to link the resulting object files. Other OSs
> >>    have much higher values but Increasiong ARG_MAX has a multiplied effect on
> >>    KVA, so just bumping this value is dangerous in some archs like ARM32 that
> >>    can exhaust KVA rather easily.
> >>    
> >>    While it would be better to have a unique value for all archs, other OSs
> >>    (Illumos in partidular) can have different ARG_MAX limits depending on the
> >>    platform,  For now we want to be really conservative so we are avoidng
> >>    the change on ILP32 and in the alternative case we only double it since tha
> >> t
> >>    seems to work well enough for recent Code Aster.
> >>    
> >>    I was planning to bump the _FreeBSD_version but it was bumped recently
> >>    (r355798) so we can reuse the 1300068 value for this change.
> > This doesn't seem right. Each bump should be for a distinct change and
> > documented as such.
> 
> TBH, it is just not worth it: this change will currently benefit only 
> one port (french/aster) and the update won't be committed until after 
> the MFC is done.

An MFC is a quite long-term solution.  If merged to 11 and 12 then any
workarounds can't be removed until 11.3 and 12.1 are EOL since we'll be
building packages there until that point.

-- Brooks
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