Messages in this thread | | | From | David Mosberger <> | Date | Wed, 18 Jun 2003 15:12:42 -0700 | Subject | Re: add /proc/sys/kernel/cache_decay_ticks |
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>>>>> On 19 Jun 2003 00:05:18 +0200, Andi Kleen <ak@suse.de> said:
Andi> David Mosberger <davidm@napali.hpl.hp.com> writes: >> /proc/sys/kernel/cache_decay_ticks allows runtime tuning of the >> scheduler. The earlier patch collided with the C99-ification of >> the file, so here is a retransmit.
Andi> Funny, I did a similar patch for 2.4 a short time ago. But I Andi> would suggest one change before you merge that to Andi> mainline. The variable is currently used like this:
Andi> #define CAN_MIGRATE_TASK(p,rq,this_cpu) \ ((jiffies - Andi> (p)->last_run > cache_decay_ticks) && \o
Andi> Which means 0 means 1 jiffie. For a tunable it would be useful Andi> to be able to turn it off completely, which means the > needs Andi> to be replaced with a >=. Unfortunately this requires changes Andi> in the architectures too to subtract one. But it would make it Andi> more useful. I would do the change before exposing it.
I don't see why the two have to be tied together. I agree it would be _nice_, but having /proc/sys/kernel/cache_decay_ticks in it's current form is much better than nothing at all.
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