Description of problem:
However in do_try_to_free_pages() (mm/vmscan.c) there is no call
to refill_freelist(). It looks like the call to refill_freelist()
was mistakenly removed when do_try_to_free_pages() cloned into
do_try_to_free_pages_kswapd(). (Maybe refill_freelist() was to be
removed in do_try_to_free_pages_kswapd() ?).

FWIW, in 2.4.18-19.7.x there is a call to refill_freelist() from
do_try_to_free_pages().

This results in a kernel hang when the workload recycles lots of
pages.

When we added the missing call to refill_freelist() in
do_try_to_free_pages(), the test was succesfull and the kernel did
not hang.

Version-Release number of selected component (if applicable):
kernel-smp-2.4.20-20.7

How reproducible:
Every time.

Steps to Reproduce:
1. Install Panasas proprietary filesystem and mount network based 
filesystem.
2. Repeatedly do dd and cp to/from Panasas filesystem and 
from/to /dev/null.
3. Watch free pages dwindle till the kernel hangs.
  
Actual results:
Kernel is not responsive. Can ping the host, but can not ssh to it.
No response to keyboard. Does respond to sysrq magic keys.

Expected results:


Additional info:
Adding refill_freelist() in do_try_to_free_pages()(mm/vmscan.c:879)
ensured that there were free pages and the test completed.