Hidden at the end of a thread titled "[PATCH] 2.5.72 O(1) interactivity 
bugfix" was a much improved patch for interactivity against 2.5.72 which 
seemed to be swallowed and never appeared on lkml so here it is again.

If a task is interactive it will declare itself in a short period and the 
max_sleep_avg being 10 seconds is too long for a task to be detected as such. 
Unfortunately decreasing the max_sleep_avg will quickly put a task onto the 
expired array if the task uses sustained cpu for a period. This makes X slow 
down after a little usage when the machine is under heavy load. 

This patch uses two settings to determine a task's interactivity, the old 
max_sleep_avg is now more of a sleep_avg "attack" and the new 
best_sleep_decay is the decay. Initially these have been set to 1 and 60 
seconds. Audio skipping is eliminated in my testing at heavy loads, and X 
does not slow down during sustained usage under very heavy load. Unlike my 
previous patch this one does not reset the sleep_avg of new forked processes.

Included as an attachment to prevent mailer mangling.

Testers required. A version for -ck will be created soon.

Con