Messages in this thread | | | Date | Tue, 18 Sep 2007 21:31:02 +0200 | From | Andrea Arcangeli <> | Subject | Re: [00/41] Large Blocksize Support V7 (adds memmap support) |
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On Mon, Sep 17, 2007 at 12:56:07AM +0200, Goswin von Brederlow wrote: > When has free ever given any usefull "free" number? I can perfectly > fine allocate another gigabyte of memory despide free saing 25MB. But > that is because I know that the buffer/cached are not locked in.
Well, as you said you know that buffer/cached are not locked in. If /proc/meminfo would be rubbish like you seem to imply in the first line, why would we ever bother to export that information and even waste time writing a binary that parse it for admins?
> On the other hand 1GB can instantly vanish when I start a xen domain > and anything relying on the free value would loose.
Actually you better check meminfo or free before starting a 1G of Xen!!
> The only sensible thing for an application concerned with swapping is > to whatch the swapping and then reduce itself. Not the amount > free. Although I wish there were some kernel interface to get a > preasure value of how valuable free pages would be right now. I would > like that for fuse so a userspace filesystem can do caching without > cripling the kernel.
Repeated drop caches + free can help. - 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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