Re: [PATCH v1 4/4] accel/tcg: increase default code gen buffer size for 64 bit

[Richard Henderson]

On 2/27/20 4:31 AM, Alex Bennée wrote:
>> It does not make sense for a linux-user chroot, running make -jN, on just 
>> about
>> any host.  For linux-user, I could be happy with a modest increase, but not 
>> all
>> the way out to 2GiB.
>>
>> Discuss.
> 
> Does it matter that much? Surely for small programs the kernel just
> never pages in the used portions of the mmap?

That's why I used the example of a build under the chroot, because the compiler
is not a small program.

Consider when the memory *is* used, and N * 2GB implies lots of paging, where
the previous N * 32MB did not.

I'm saying that we should consider a setting more like 128MB or so, since the
value cannot be changed from the command-line, or through the environment.


r~