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    SubjectRe: Recursive chmod/chown OOM kills box with 32MB RAM
    Denis Vlasenko wrote:

    >On Monday 30 January 2006 15:22, Chris Mason wrote:
    >
    >
    >>On Monday 30 January 2006 01:11, Hans Reiser wrote:
    >>
    >>
    >>>Chris, would Denis Vlasenko wrote:
    >>>
    >>>
    >>>>[CCing namesys]
    >>>>
    >>>>Narrowed it down to 100% reproducible case:
    >>>>
    >>>> chown -Rc 0:<n> .
    >>>>
    >>>>in a top directory of tree containing ~21938 files
    >>>>on reiser3 partition:
    >>>>
    >>>> /dev/sdc3 on /.3 type reiserfs (rw,noatime)
    >>>>
    >>>>causes oom kill storm. "ls -lR", "find ." etc work fine.
    >>>>
    >>>>I suspected that it is a leak in winbindd libnss module,
    >>>>but chown does not seem to grow larger in top, and also
    >>>>running it under softlimit -m 400000 still causes oom kills
    >>>>while chown's RSS stays below 4MB.
    >>>>
    >>>>
    >>In order for the journaled filesystems to make sure the FS is consistent after
    >>a crash, we need to keep some blocks in memory until other blocks have been
    >>written. These blocks are pinned, and can't be freed until a certain amount
    >>of io is done.
    >>
    >>In the case of reiserfs, it might pin as much as the size of the journal at
    >>any time. The default journal is 32MB, which is much too large for a system
    >>with only 32MB of ram.
    >>
    >>You can shrink the log of an existing filesystem. The minimum size is 513
    >>blocks, you might try 1024 as a good starting poing.
    >>
    >>reiserfstune -s 1024 /dev/xxxx
    >>
    >>The filesystem must be unmounted first.
    >>
    >>
    >
    >Will try this and report the result.
    >
    >Please consider printing a big fat warning at mount time if total RAM
    >on the system is close to sum of RAM space required for all currently
    >mounted reiserfs partitions...
    >--
    >vda
    >
    >
    >
    >
    I already suggested this to Chris.;-) I agree.

    Best,

    Hans
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