[Fontconfig] [PATCH 1/2] Use MAP_POPULATE to eliminate startup page faults.
keithp at keithp.com
Thu Dec 31 16:27:01 PST 2009
On Thu, 31 Dec 2009 21:54:10 +0100, Behdad Esfahbod <behdad at behdad.org> wrote:
> The mmap manpage says: MAP_POPULATE is only supported for private mappings
> since Linux 2.6.23. Does the POPULATE do anything with MAP_SHARED?
Hrm. I recall measuring this a while ago and finding some difference in
the page fault counts, but I cannot replicate that now (even after
fixing my patch to not call mmap twice). I'd say you can discard this patch.
> An alternative would be calling fadvise().
This also has no effect:
posix_fadvise(fd, 0, fd_stat->st_size, POSIX_FADV_WILLNEED))
Looks like whatever effect I measured has disappeared in more recent
keith.packard at intel.com
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