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DateFri, 21 Nov 2003 16:34:11 +0900
FromIWAMOTO Toshihiro <>
SubjectRe: O_DIRECT leaks memory on linux-2.6.0-test9
At Thu, 20 Nov 2003 23:17:49 -0800,
Andrew Morton wrote:
> 
> IWAMOTO Toshihiro <iwamoto@valinux.co.jp> wrote:
> >
> >  recently I noticed that direct IO causes memory leaks with
> >  linux-2.6.0-test9.
> >  The program that causes memory leaks is "fsstress", which is
> >  testcases/kernel/fs/fsstress in ltp-full-20031106.tgz (ftp from
> >  http://sourceforge.net/projects/ltp/).
> > 
> >  fsstress does various file operations, and I found that the problem is
> >  with the combination of write and dread (O_DIRECT read).
> >  You should be able to reproduce the bug with the following command
> >  line.
> > 
> >  $ while true; do ./fsstress -c -d /usr/src/test -z -f write=1 \
> >   -f dread=1 -f creat=1 -S -n 1000 -p 32; done
> 
> It seems OK here.   Please take a copy of /proc/meminfo and /proc/slabinfo.

It'll take a while to leak a noticable amount of memory. So I reduced
the amount of memory using a boot option.
I'll try the same test on another machine.

Here they are. slabinfo is in the attachment.

$ cat /proc/meminfo
MemTotal:       254592 kB
MemFree:          3952 kB
Buffers:           688 kB
Cached:           6184 kB
SwapCached:       2512 kB
Active:           8616 kB
Inactive:       212056 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:       254592 kB
LowFree:          3952 kB
SwapTotal:     2097136 kB
SwapFree:      2090436 kB
Dirty:               0 kB
Writeback:           0 kB
Mapped:           4924 kB
Slab:            15200 kB
Committed_AS:    20580 kB
PageTables:        344 kB
VmallocTotal:   770040 kB
VmallocUsed:      9460 kB
VmallocChunk:   760580 kB

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