Re: [PATCH] mm: page_alloc: Avoid marking zones full prematurelyafter zone_reclaim()
From: Michal Hocko
Date: Tue Apr 09 2013 - 06:14:43 EST
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
> >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.
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