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
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This archive was generated by hypermail 2b29 : Mon Jun 23 2003 - 22:00:29 EST