Messages in this thread | | | Date | Fri, 21 Nov 2003 16:34:11 +0900 | From | IWAMOTO Toshihiro <> | Subject | Re: O_DIRECT leaks memory on linux-2.6.0-test9 |
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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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