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Date: Mon, 13 Aug 2007 15:53:00 +0200 From: Peter Zijlstra <peterz@...radead.org> To: Pavel Machek <pavel@....cz> Cc: Andrew Morton <akpm@...l.org>, kernel list <linux-kernel@...r.kernel.org>, andrea@...e.de, npiggin@...e.de Subject: Re: min_free_kbytes documentation, /proc/sys/vm docs On Mon, 2007-08-13 at 15:46 +0200, Pavel Machek wrote: > Hi! > > min_free_kbytes documentation says: > > min_free_kbytes: > > This is used to force the Linux VM to keep a minimum number > of kilobytes free. The VM uses this number to compute a pages_min > value for each lowmem zone in the system. Each lowmem zone gets > a number of reserved free pages based proportionally on its size. > > ....which is not too helpful :-(. In particular, should kernel survive > setting this to 0 and still work reliably? IOW is this > performance-only tweak, or does it correctness implications? correctness sort-of, since PF_MEMALLOC usage is currently un-bounded. > I guess it should also say something like "do not set this to more > than half of your physical RAM (or half of lowmem?) or you get an > instant OOM". yeah, lowmem, not sure on the oom part, it should work with quite high limits, although I've never tried it with ridiculous numbers. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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