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Re: [PATCH v4 2/2] tools/xenstore: set open file descriptor limit for xenstored

On 27.09.21 16:13, Andrew Cooper wrote:
On 27/09/2021 11:48, Juergen Gross wrote:
Add a configuration item for the maximum number of open file
descriptors xenstored should be allowed to have.

The default should be "unlimited" in order not to restrict xenstored
in the number of domains it can support, but unfortunately the prlimit
command requires specification of a real value for the number of files,
so use 262144 as the default value.

Citation needed.

prlimit -nunlimited

prlimit --nofile=unlimited

both work fine, and strace confirms they issue correct system calls.

Not on my test system:

# prlimit --pid 734 --nofile=unlimited
prlimit: failed to set the NOFILE resource limit: Operation not permitted
# prlimit --pid 734 --nofile=262144

Support for "unlimited" as a parameter has existed for the entire
lifetime of the utility,

Yes, but not all systems seem to support raising the limit to


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