Messages in this thread | | | From | Con Kolivas <> | Subject | Re: [PATCH] mm: limit lowmem_reserve | Date | Thu, 18 May 2006 17:21:38 +1000 |
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On Thursday 18 May 2006 17:11, Nick Piggin wrote: > If we're under memory pressure, kswapd will try to free up any candidate > zone, yes. > > > On my test case this indeed happens and my ZONE_DMA never goes below 3000 > > pages free. If I lower the reserve even further my pages free gets stuck > > at 3208 and can't free any more, and doesn't ever drop below that either. > > > > Here is the patch I was proposing > > What problem does that fix though?
It's a generic concern and I honestly don't know how significant it is which is why I'm asking if it needs attention. That concern being that any time we're under any sort of memory pressure, ZONE_DMA will undergo intense reclaim even though there may not really be anything specifically going on in ZONE_DMA. It just seems a waste of cycles doing that.
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