Re: [PATCH] Avoiding mmap fragmentation (against 2.6.12-rc4) to

Ingo Molnar
2005-05-12T07:07:36Z

* Wolfgang Wander <wwc@rentec.com> wrote:

> The patch below is against linux-2.6.12-rc4.
>
> Ingo recently introduced a great speedup for allocating new mmaps
> using the free_area_cache pointer which boosts the specweb SSL
> benchmark by 4-5% and causes huge performance increases in thread
> creation.

small correction: 'recently' was more than 2.5 years ago (!). So this
issue is something that hits certain rare workloads. Note that the mmap
speedup was also backported to 2.4 so it is quite widely deployed. This
is the first time anyone complained.

Ingo