Process stuck in R state at extent = 2049

[Sakai Yasutoshi <sakai-yasutoshi@xxxxxxxxxxxxx>]

Hi.

We are running linux 2.4.26 on IBM PPC405GP.

Sometimes our process stuck in 'R' state when number of extent reaches 
2049.
And disk cache is freed at same time, so we have 40Mbyte of free memory,
but we get kernel message "kernel: __alloc_pages: 4-order allocation 
failed (gfp=0xf0/0)".
Process reverts to normal state after 5 seconds to 20 minutes once in a 
while.
is this XFS problem?

Regards, 

Yasutoshi Sakai