Messages in this thread | | | Date | Mon, 22 Jan 2007 18:44:02 -0800 (PST) | From | Christoph Lameter <> | Subject | Re: Why active list and inactive list? |
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On Mon, 22 Jan 2007, Rik van Riel wrote:
> The big one is how we are to do some background aging in a > clock-pro system, so referenced bits don't just pile up when > the VM has enough memory - otherwise we might not know the > right pages to evict when a new process starts up and starts > allocating lots of memory.
There are two bad choices right?
1. Scan for reference bits
Bad because we may have to scan quite a bit without too much result. LRU allows us to defer this until memory is tight. Any such scan will pollute the cache and cause a stall of the app. You really do not want this for a realtime system.
2. Take faults on reference and update the page state. Bad because this means a fault if the reference bit has not been set. Could be many faults.
Clock pro really requires 2 right? So lots of additional page faults? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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