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SubjectRe: [PATCH] mm: page_alloc: Avoid marking zones full prematurely after zone_reclaim()
Hi Michal,
On 04/09/2013 06:14 PM, Michal Hocko wrote:
> On Tue 09-04-13 18:05:30, Simon Jeons wrote:
> [...]
>>> I try this in v3.9-rc5:
>>> dd if=/dev/sda of=/dev/null bs=1MB
>>> 14813+0 records in
>>> 14812+0 records out
>>> 14812000000 bytes (15 GB) copied, 105.988 s, 140 MB/s
>>>
>>> free -m -s 1
>>>
>>> total used free shared buffers
>>> cached
>>> Mem: 7912 1181 6731 0 663 239
>>> -/+ buffers/cache: 277 7634
>>> Swap: 8011 0 8011
>>>
>>> It seems that almost 15GB copied before I stop dd, but the used
>>> pages which I monitor during dd always around 1200MB. Weird, why?
>>>
>> Sorry for waste your time, but the test result is weird, is it?
> I am not sure which values you have been watching but you have to
> realize that you are reading a _partition_ not a file and those pages
> go into buffers rather than the page chache.

buffer cache are contained in page cache, is it? Which value I should watch?




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