Messages in this thread | | | Date | Tue, 08 Dec 2009 17:34:14 +0800 | From | Cong Wang <> | Subject | Re: [RFC Patch] getrusage: fill ru_ixrss, ru_idrss and ru_isrss fields |
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KOSAKI Motohiro wrote: >> KOSAKI Motohiro wrote: >>> The next three fields, the subject of this patch, are named ru_XXrss: >>> though the 80-column comment omits to say "resident set" before "size", >>> I believe they'd be expected to account (subdivided) resident set sizes? >>> >>> >>> your calculation is not rss nor not integral. >>> >> Hmm, I misunderstood rss here. Does it mean the memory stayed in >> physical mem? i.e. not swapped out. > > Yes. > > Plus, 'integral' mean "tick * rss". but in dyntick environment, per tick statistics is not > so easy nor low cost.
Thanks for explanation!
> >> So, if I want to get those rss statistics, I have to add some more >> mm_counter by myself? I only find file_rss and anon_rss in mm_struct. > > Hmm.. > I doubt nobody use such statistics. if nobody explain real world usage, I oppose to add > new counter overhead.
Well, this is one of the usages. :)
I just checked more, I found it's not easy to add rss statistics for stack, executable, etc... the reason is that we don't have a page flag to mark a page as used for stack etc.
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