Re: [libvirt] [PATCH 1/2] Introduce posix_fallocate() to allocate disk space

On (Thu) Mar 19 2009 [10:39:05], Daniel P. Berrange wrote: > char * buf = mmap(NULL, len, MAP_SHARED, MAP_ANONYMOUS, fd, offset) > memset(buf, 0, len); > munmap(buf, len); > > Or, do your calloc() of a 1 MB chunk, and then call safewrite in a > loop, just to avoid too large a memory allocation. Yeah; I forgot the free(). My approach was to never allocate more than 500MiB. However we can call safezero() itself with less than 500M; is 200M OK?