Messages in this thread | | | Date | Fri, 20 Aug 1999 16:43:40 +0200 (CEST) | From | Andrea Arcangeli <> | Subject | Re: 2.3.14 shared mem in /proc/memnfo is zero |
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On Fri, 20 Aug 1999, Oleg Drokin wrote:
>So what is the new meaning of MemShared?
nothing. To calc such information we should do a O(N) algorithm scanning all the mem_map array. Now si_meminfo runs in O(1). You have less information but after all the shared counter is just been screwed up by the page-buffer cache unification of 2.3.x since most page-cache pages now have the page count > 1 even if they live in cache (and they are not mapped in userspace memory).
I am not the author of such change but I sure agree with it. (for debugging you have the shared information in SYSRQ+M, SYSRQ+M runs in O(N) as usual of course ;).
Andrea
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