Messages in this thread | | | Date | Wed, 10 Aug 2005 17:32:48 +0100 (IST) | From | Mel Gorman <> | Subject | Re: How to reclaim inode pages on demand |
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On Mon, 8 Aug 2005, Andrew Morton wrote:
> Mel Gorman <mel@csn.ul.ie> wrote: > > > > Hi, > > > > I am working on a direct reclaim strategy to free up large blocks of > > contiguous pages. The part I have is working fine, but I am finding a > > hundreds of pages that are being used for inodes that I need to reclaim. I > > tried purging the inode lists using a variation of prune_icache() but it > > is not working out. > > > > Given a struct page, that one knows is an inode, can anyone suggest the > > best way to find the inode using it and free it? > > Simple answer: invalidate_mapping_pages(page->mapping, start, end). >
The majority of pages I am seeing no longer have page->mapping set. Does this mean they are in the process of being cleared up?
> Problem: races. If you pick a random page up off the LRU and start playing > with its mapping, what stops that mapping from getting freed under your > feet? >
Nothing at all, which explains why I occasionally got oops when I was trying to free pages with the mapping set. I am going to follow your suggestions and see how I get on.
If it is still not working out, I will try reclaiming when the workload is something other than a large number of kernel compiles to see if I am on the right track at all.
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