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Message-ID: <20130312083711.GA1943@gmail.com> Date: Tue, 12 Mar 2013 16:37:11 +0800 From: Zheng Liu <gnehzuil.liu@...il.com> To: Lenky Gao <lenky.gao@...il.com> Cc: linux-ext4@...r.kernel.org Subject: Re: Inactive memory keep growing and how to release it? Hi Gao, On Tue, Mar 12, 2013 at 02:58:24PM +0800, 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): 554662 kB > ... > #cat /proc/meminfo | grep Inactive\(fi > Inactive(file): 882824 kB > > and i cannot reclaim it: > > # cat /proc/meminfo | grep Inactive\(file\); > Inactive(file): 882824 kB > # sync; > # echo 3 > /proc/sys/vm/drop_caches > # cat /proc/meminfo | grep Inactive\(file\); > Inactive(file): 777664 kB > > My file system type is ext3, mounted with the option data=journal and > it is easy to reproduce. If the mount option is data=ordered, > reproducing this problom need more time. Because of the problom, when > in the final situation, i cannot kmalloc a larger contiguous memory, > especially in interrupt context. I have tested on other version > kernel, such as 2.6.30 and 3.6.11, the problom also exists. > > Is this a bug? I don't think it is a bug. If I understand correctly, when you try to reclaim memory (sync and drop caches), the test script is still running, right? If so, that means that some memory will be re-dirtied again. So the number of inactive pages could not reduce as you expected. Regards, - Zheng -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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