dentry cache leak? Re: rsync out of memory 2.6.8-rc2

bert hubert
2004-07-19T11:20:50Z

On Mon, Jul 19, 2004 at 11:19:43AM +0200, Klaus Dittrich wrote:

> I found out I could trigger the memory outage using du -s /disc1 too.

Including crashing and/or running out of swap? That would indicate that the
dentry cache is not cleaning itself up, or that something is wrong with
reference counting.

Can you run 'cat fs/dentry-state' before and after the du -s? (assuming
there is an 'after'. Also, which fs is /disc1 on? any messages in dmesg?

dentry-state
------------

Status of the directory cache. Since directory entries are
dynamically allocated and deallocated, this file indicates the current
status. It holds six values, in which the last two are not used and are
always zero. The others are listed in table 2-1.

Table 2-1: Status files of the directory cache
..............................................................................
File Content
nr_dentry Almost always zero
nr_unused Number of unused cache entries
age_limit
in seconds after the entry may be reclaimed, when memory is
short
want_pages internally

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