releasing page cached pages in 2.4.20

[Rimaher Molanski]

Hi,
I'm conducting a small analysis of cache algorithms, and have run into 
problems trying to implement cache eviction in 2.4.20 kernel.   I call 
try_to_release_page (with GFP_NOIO flag) on pages that aren't referenced by 
anything other than page cache and sometimes also the buffer cache.  I 
sometimes do this call from inside the scheduler tq (a task_schedule 
function), if this is relevant.

Anyway, in certain scenarios I get deadlocked on the text.lock.buffer lock, 
and I have no idea which locks I must obtain (or any other prerequisites) 
before I can safely call try_to_release_page. Can anyone help on the 
requirements?  Also, is there a simpler function I could call to get the job 
done?

Thanks,
Rimaher.

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