Messages in this thread |  | | From | "Jon Burgess" <> | Date | Thu, 31 Aug 2000 18:25:48 +0100 | Subject | Re: 2.2.[16,17pre20] VM do_try_to_free_pages |
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> When trying to compile SimGear-0.0.12 under 2.2.16, with gcc-2.95.2, > I could (quite reproducibly) cause an unbounded number of: > > VM: do_try_to_free_pages failed for x > >where x was cc1plus, kswapd, syslogd, etc. > >Under 2.2.17pre20, this still start to happen, but shortly thereafter >the kernel kills cc1plus, and it stops. I don't think I'm reaching >memory exhaustion; I've got 256M ram, and I ran the compile from the >console with nothing else running. > >Is the cause of this behavior known, and if not, what can I do to help >diagnose it?
I've read that seeing a few of these messages is ok, but I too have experienced the case where these messages loop forever. Sys-Rq is still active, so some stats can be dumped. This occurs for me when I run a dbench test with 35 or more clients on a machine with 32Mb of RAM.
I believe this first occured in the changes made between 2.2.17pre3 and pre4. With pre3 I can run dbench for days without problems, with pre4 it dies within a few hours. I've tried this with 2.2.17pre19 and the problem still exists.
I think that reverting the changes to the do_try_to_swap_out & kswapd functions in mm/vmscan.c fixes the problem, but i've been busy fixing other things recently to prove that this really is a good fix.
Jon
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