On 04.03.2013 10:52, Lenky Gao wrote:
Hi,
When i just run a test on Centos 6.2 as follows:
#!/bin/bash
while true
do
file="/tmp/filetest"
echo $file
dd if=/dev/zero of=${file} bs=512 count=204800 &> /dev/null
sleep 5
done
the inactive memory keep growing:
#cat /proc/meminfo | grep Inactive\(fi
Inactive(file): 420144 kB
...
#cat /proc/meminfo | grep Inactive\(fi
Inactive(file): 911912 kB
...
#cat /proc/meminfo | grep Inactive\(fi
Inactive(file): 1547484 kB
...
and i cannot reclaim it:
# cat /proc/meminfo | grep Inactive\(fi
Inactive(file): 1557684 kB
# echo 3 > /proc/sys/vm/drop_caches
# cat /proc/meminfo | grep Inactive\(fi
Inactive(file): 1520832 kB
I have tested on other version kernel, such as 2.6.30 and .6.11, the
problom also exists.
When in the final situation, i cannot kmalloc a larger contiguous
memory, especially in interrupt context.
Can you give some tips to avoid this?
The drop_caches mechanism doesn't free dirty page cache pages. And your
bash script is creating a lot of dirty pages. Run it like this and see
if it helps your case:
sync; echo 3 > /proc/sys/vm/drop_caches
Regards,
--
Zlatko
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