Re: [PATCH v5] tools/xenconsoled: Increase file descriptor limit

[Ian Campbell <ian.campbell@citrix.com>]

On Fri, 2015-02-27 at 17:53 +0000, Andrew Cooper wrote:
> XenServer's VM density testing uncovered a regression when moving from
> sysvinit to systemd where the file descriptor limit dropped from 4096 to
> 1024. (XenServer had previously inserted a ulimit statement into its
> initscripts.)
> 
> One solution is to use LimitNOFILE=4096 in xenconsoled.service to match the
> lost ulimit, but that is only a stopgap solution.
> 
> As Xenconsoled genuinely needs a large number of file descriptors if a large
> number of domains are running, attempt to increase the limit.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
> CC: Ian Campbell <Ian.Campbell@citrix.com>
> CC: Ian Jackson <Ian.Jackson@eu.citrix.com>
> CC: Wei Liu <wei.liu2@citrix.com>

I tried to apply but I'm afraid that for 32-bit userspace this gives me:

daemon/main.c: In function 'increase_fd_limit':
daemon/main.c:89:10: error: format '%lu' expects argument of type 'long unsigned int', but argument 3 has type 'rlim_t' [-Werror=format]
daemon/main.c:89:10: error: format '%lu' expects argument of type 'long unsigned int', but argument 4 has type 'rlim_t' [-Werror=format]
daemon/main.c:89:10: error: format '%lu' expects argument of type 'long unsigned int', but argument 5 has type 'rlim_t' [-Werror=format]
daemon/main.c:89:10: error: format '%lu' expects argument of type 'long unsigned int', but argument 6 has type 'rlim_t' [-Werror=format]

I've no idea how one is formally supposed to print and rlim_r.

Ian.