Re: mlockall() with pid parameter

[Vlastimil Babka <vbabka@suse.cz>]

On 12/07/2016 04:39 PM, Federico Reghenzani wrote:
> Hello,
> 
> I'm working on Real-Time applications in Linux. `mlockall()` is a
> typical syscall used in RT processes in order to avoid page faults.
> However, the use of this syscall is strongly limited by ulimits, so
> basically all RT processes that want to call `mlockall()` have to be
> executed with root privileges.

Is it not possible to change the ulimits with e.g. prlimit?

> What I would like to have is a syscall that accept a "pid", so a process
> spawned by root would be able to enforce the memory locking to other
> non-root processes. The prototypes would be:
> 
> int mlockall(int flags, pid_t pid);
> int munlockall(pid_t pid);
> 
> I checked the source code and it seems to me quite easy to add this
> syscall variant.
> 
> I'm writing here to have a feedback before starting to edit the code. Do
> you think that this is a good approach?
> 
> 
> Thank you,
> Federico
> 
> -- 
> *Federico Reghenzani*
> PhD Candidate
> Politecnico di Milano
> Dipartimento di Elettronica, Informazione e Bioingegneria
> 

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