Messages in this thread | | | Subject | Re: + prctl-add-pr_set_proctitle_area-option.patch added to -mm tree | From | Timo Sirainen <> | Date | Tue, 10 Nov 2009 13:00:16 -0500 |
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On Wed, 2009-11-11 at 02:48 +0900, KOSAKI Motohiro wrote: > There is unwritten reason. I hope to add /proc/[pid]/cmdline cache. It > help to avoid > ps getting stuck by mmap_sem.
Can you explain this further? When would it cache the value and when would it be returned? I was at least hoping to avoid calling prctl() every time when I want process title changed.
I think Solaris saves the first 80 chars of the initial cmdline to kernel memory and gives that to ps. I guess doing something similar and returning it only when userspace memory can't be accessed would be ok.
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