Messages in this thread | | | Subject | Re: The VFS cache is not freed when there is not enough free memory to allocate | From | Peter Zijlstra <> | Date | Wed, 22 Nov 2006 11:42:51 +0100 |
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On Wed, 2006-11-22 at 18:02 +0800, Aubrey wrote: > On 11/22/06, Peter Zijlstra <a.p.zijlstra@chello.nl> wrote: > > Please see the > > threads on Mel Gorman's Anti-Fragmentation and Linear/Lumpy reclaim in > > the linux-mm archives. > > > > Thanks to point this. Is it already included in Linus' git tree?
No it is not.
> Well, the test application just use an exaggerated way to replicate the issue. > > Actually, In the real work, the application such as mplayer, asterisk, > etc will run into > the above problem when run them at the second time. I think I have no > reason to modify those kind of applications.
It comes from the choice of architecture, I'd not run general purpose code like that on MMU-less hardware. But yeah, I see your point.
> My patch let kernel drop VFS cache in the low memory situation when > the application requests more memory allocation, I don't think it's > luck. You know, the application just wants to allocate 8 > 1Mbyte-blocks(order =9) and releasing VFS cache we can get almost > 50Mbyte free memory.
Yes it does that, but there is no guarantee that those 50MB have a single 1M contiguous region amongst them.
> The patch indeedly enabled many failed test cases on our side. But > yes, I don't think it's the final solution. I'll try Mel's patch and > update the results.
Mel's patches alone aren't quite enough, you also need some reclaim modifications, I'll ping Andy to see how far he's on that.
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