Messages in this thread |  | | Date | Sun, 7 Oct 2001 00:58:41 +0200 (CEST) | From | Mikulas Patocka <> | Subject | Re: %u-order allocation failed |
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> > > Nothing dangeorus there. The -ac vm isnt triggering these cases. > > > > Sorry, but it can be triggered by _ANY_ VM since buddy allocator was > > introduced. You have no guarantee, that you find two or more consecutive > > free pages. And if you don't, poll() fails. > > The two page case isnt one you need to worry about. To all intents and > purposes it does not happen,
How do you know it? I showed a simple case where it may happen.
> and if you do the maths it isnt going to > fail in any interesting ways. Once you go to the 4 page set the odds get > a lot longer and then rapidly get very bad indeed,
I hope you don't want to count probability that the server will or won't crash (yes, crash, because when poll in main loop fails, the server process has not many choices - it can only terminate itself). This reminds me some Microsoft announcement saying that Windows NT are 3 times more stable than Windows 95 :-)
And it does happen - see this: http://www.uwsg.indiana.edu/hypermail/linux/kernel/0012.3/0711.html Maybe probability was reduced somehow, but the problem is still there.
Mikulas
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