On 08/15/2012 05:05 AM, Petr Tesarik wrote:
Hi folks,
while looking at my /proc/zoneinfo, I noticed that the counters are a bit
strange:
Node 0, zone DMA
pages free 3945
min 7
low 8
high 10
scanned 0
spanned 4080
present 3905
nr_free_pages 3945
OK, you'll probably argue that the rest is hidden in PCP differentials... BUT:
1. this machine has only 2 CPUs
2. stat_threshold = 4
3. vm_stat_diff[NR_FREE_PAGES] = 0 on both CPUs
Is this only me? Or do I misrepresent what these number actually tell?
Present should always be equal to or smaller
than spanned, as well as equal to or larger
than free.
Something looks odd...
I wonder if the statistic ends up going off
at bootmem free time?
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