[systemd-devel] [PATCH] Detect page size runtime

[Jan Engelhardt]

On Saturday 2011-03-19 03:10, Lennart Poettering wrote:

>On Fri, 18.03.11 03:44, fykcee1 at gmail.com (fykcee1 at gmail.com) wrote:
>
>> Hi all,
>> 
>> Systemd hardcode page size as 4096(in macro.h), this is not always correct:
>> """ Some architectures support multiple machine types with diffenent
>> page sizes, and some machine types even support multiple page sizes
>> themselves. """
>> 
>> This patch tries to detect page size runtime by sysconf(_SC_PAGESIZE),
>> and uses 4096 as a failsafe value. Note we need memset vec to zero
>> before call mincore(src/readahead-collect.c, 129) -- if the pagesize
>> is not correct, we may randomly record wider range or more ranges to
>> readahead.
>
>Hmm, interesting. Which architecture are you using that has a page size
>!= 4K?

sparc64 would, to name one.