Messages in this thread Patch in this message | | | Date | Sun, 6 Apr 2003 18:24:35 -0700 | From | Andrew Morton <> | Subject | Re: 2.5.66-(bk) == horrible response times for non X11 applications |
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Zwane Mwaikambo <zwane@linuxpower.ca> wrote: > > This was not reproduceable with 2.4.18-3 nor with 2.5.66 and the > following patch applied; > > http://www.kernel.org/pub/linux/kernel/people/akpm/patches/2.5/2.5.66/2.5.66-mm3/broken-out/sched-interactivity-backboost-revert.patch >
There have been multiple reports of this patch fixing starvation problems.
We need to either apply it or fix up the problem by other means.
From: Ingo Molnar <mingo@elte.hu>
the patch below fixes George's setiathome problems (as expected). It essentially turns off Linus' improvement, but i dont think it can be fixed sanely.
the problem with setiathome is that it displays something every now and then - so it gets a backboost from X, and hovers at a relatively high priority.
kernel/sched.c | 13 +------------ 1 files changed, 1 insertion(+), 12 deletions(-)
diff -puN kernel/sched.c~sched-interactivity-backboost-revert kernel/sched.c --- 25/kernel/sched.c~sched-interactivity-backboost-revert 2003-03-28 22:30:08.000000000 -0800 +++ 25-akpm/kernel/sched.c 2003-03-28 22:30:08.000000000 -0800 @@ -379,19 +379,8 @@ static inline int activate_task(task_t * * boosting tasks that are related to maximum-interactive * tasks. */ - if (sleep_avg > MAX_SLEEP_AVG) { - if (!in_interrupt()) { - sleep_avg += current->sleep_avg - MAX_SLEEP_AVG; - if (sleep_avg > MAX_SLEEP_AVG) - sleep_avg = MAX_SLEEP_AVG; - - if (current->sleep_avg != sleep_avg) { - current->sleep_avg = sleep_avg; - requeue_waker = 1; - } - } + if (sleep_avg > MAX_SLEEP_AVG) sleep_avg = MAX_SLEEP_AVG; - } if (p->sleep_avg != sleep_avg) { p->sleep_avg = sleep_avg; p->prio = effective_prio(p); _
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