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Re: Memory usage increased

From: Johannes Hofmann <johannes.hofmann@xxxxxx>
Date: 10 May 2010 01:56:09 GMT

Steve O'Hara-Smith <steve@sohara.org> wrote:
>        Hi,
>        OK I think I have something concrete - running hammer rebalance on
> a freshly booted machine runs the active memory usage up past 2GB and it
> stays there after the rebalance has finished even when the machine is left
> alone for some time.
>        Unmounting and remounting the filesystem clears up the memory usage
> but nothing else seems to do it.
>        I can understand that operations like this will bring a lot of
> blocks into memory and it probably helps performance on systems with high
> filesystem activity to keep them in but surely they shouldn't stay on the
> active queue, where the memory cannot be reused, indefinitely. Shuffling
> them off to the inactive queue once they are written out (or just not dirty)
> would enable the blocks to be reused and seems to make more sense to me.

This sounds exactly like what I was observing before
the read-ahead fix in 69adbed48cd5565446e8013fcc5131405a9e7c05
Any chance, that you don't have that fix for some reason?

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