2.6.16-mm1 leaks in dvb playback

[Adrian Bridgett <adrian@smop.co.uk>]

I've had this problem for a little while (probably since 2.6.14/15
era) but I've only recently spent some time to figure out what's been
going wrong.

There is a patch in the -mm series which causes leaks in both
sock_inode_cache and dentry_cache for me during DVB playback (thanks
to slabtop). 

2.6.16 is fine (no leakage), 2.6.16-mm1 has this problem (~ 2MB/s in
each cache).

I'm using dvbstream and sending the output to /dev/null,  dvb modules
loaded are dvb_usb_vp7045, dvb_usb, dvb_core, dvb_pll.  It's an EHCI USB
device running on a Dell D600 latitude.

turning on some debugging and looking at /proc/slab_allocators and
/proc/page_owners shows that the most prevalent page owners are:

(5363 out of 5631)
Page allocated via order 0, mask 0xd0
[0xc0161079] poison_obj+41
[0xc0162355] cache_alloc_refill+981
[0xc0161889] cache_alloc_debugcheck_after+169
[0xc01d5169] vsnprintf+857
[0xc0247eec] lock_sock+204
[0xc0244999] sock_alloc_inode+25
[0xc0161f73] kmem_cache_alloc+131
[0xc027a4b4] inet_csk_accept+436

(1989 out of 2734)
Page allocated via order 0, mask 0xd0
[0xc0162355] cache_alloc_refill+981
[0xc0161079] poison_obj+41
[0xc0161079] poison_obj+41
[0xc01d5169] vsnprintf+857
[0xc0182341] d_alloc+33
[0xc0161f73] kmem_cache_alloc+131
[0xc0182341] d_alloc+33
[0xc02461e0] sock_attach_fd+96

I don't normally read LKML so best to Cc me in case I forget :-)  

Many thanks,

Adrian
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