Messages in this thread | | | From | Con Kolivas <> | Subject | Re: Respin: [PATCH] mm: limit lowmem_reserve | Date | Thu, 6 Apr 2006 14:52:42 +1000 |
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On Thursday 06 April 2006 14:36, Con Kolivas wrote: > On Thursday 06 April 2006 13:40, Andrew Morton wrote: > > Con Kolivas <kernel@kolivas.org> wrote: > > > On Thursday 06 April 2006 12:55, Con Kolivas wrote: > > > > On Thursday 06 April 2006 12:43, Andrew Morton wrote: > > > > > Con Kolivas <kernel@kolivas.org> wrote: > > > > > > It is possible with a low enough lowmem_reserve ratio to make > > > > > > zone_watermark_ok fail repeatedly if the lower_zone is small > > > > > > enough. > > > > > > > > > > Is that actually a problem? > > > > > > > > Every single call to get_page_from_freelist will call on zone > > > > reclaim. It seems a problem to me if every call to __alloc_pages will > > > > do that? > > > > > > every call to __alloc_pages of that zone I mean > > > > One would need to check with the NUMA guys. zone_reclaim() has a > > (lame-looking) timer in there to prevent it from doing too much work. > > > > That, or I'm missing something. This problem wasn't particularly well > > described, sorry. > > Ah ok. This all came about because I'm trying to honour the lowmem_reserve > better in swap_prefetch at Nick's request. It's hard to honour a watermark > that on some configurations is never reached.
Forget that. If the numa people don't care about it I shouldn't touch it. I thought I was doing something helpful at the source but got no response from Nick or the the other numa_ids out there so they obviously don't care. I'll tackle it differently in swap prefetch.
Cheers, Con - 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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