Re: [Sbcl-devel] Changes to GENCGC memory zeroing

[Florian W. <fw...@de...>]

* Juho Snellman:

>   * Instead of zeroing memory by remapping memory with munmap/mmap at
>     GC time, pages are just marked as needing zeroing and zeroed with
>     memset when they're added to a new allocation region. This reduces
>     GC latency both for the common and worst cases (~30% improvement
>     for both on an Athlon X2 with kernel 2.6.14, ~5% average/~15%
>     worst-case on a PIII/2.6.10).

I think you could put in a madvise(MADV_DONTNEED), which indicates to
the kernel that you no longer need its contents.