Messages in this thread | | | Date | Tue, 2 Dec 2003 10:33:10 -0800 | From | Mike Fedyk <> | Subject | Rmap was: 2.4.20 page cache information |
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On Tue, Dec 02, 2003 at 04:33:23AM -0800, kernwek jalsl wrote: > Hello Everyone; > > On my embedded system having 64MB of RAM and no swap, > I see the following information on opening > /proc/meminfo: >
Everything goes through the page cache, including all of your apps. The executables are mapped through the page cache, cache is combined with executable data.
And you have a kernel patched with the rmap VM.
All numbers are seperate below:
> total: used: free: shared: buffers: > cached: > Mem: 62894080 47947776 14946304 0 4964352 > 23674880 > Swap: 0 0 0 > MemTotal: 61420 kB
MemTotal =
> MemFree: 14596 kB > Active: 32340 kB > Inact_dirty: 0 kB > Inact_laundry: 6336 kB > Inact_clean: 236 kB > Inact_target: 7780 kB
Not sure why Inact_target is in there, but it adds up almost perfect to memtotal.
These below are within the active/inactive lists:
> MemShared: 0 kB > Buffers: 4848 kB > Cached: 23120 kB > SwapCached: 0 kB
> ActiveAnon: 10760 kB > ActiveCache: 21580 kB
Remember, that's active. If it's not active, then it's in the inactive list. And it doesn't show inactive_anon memory (because it's not on a seperate list)
> HighTotal: 0 kB > HighFree: 0 kB > LowTotal: 61420 kB > LowFree: 14596 kB > SwapTotal: 0 kB > SwapFree: 0 kB >
Don't try adding the numbers on stock 2.4, they're just not fully accounted in /proc/meminfo, but with rmap you can get close.
> As I see the total memory belonging to page cache is > 23MB and the anonymous list is 10MB. But if I count > the RSS values for all the processes running on the > system, it hardly comes to 15MB. Where is the rest of > the 18MB? If I understand the "cached:" = (pages in > the page cache - buffer cache). Even if I am doing > lots of file activity; I cannot imagine the file > system reads and writes holding up 18MB of the page > cache. Am I missing something here?
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