Messages in this thread | | | Date | Wed, 10 Aug 2005 18:27:26 +0100 (IST) | From | Mel Gorman <> | Subject | Re: How to reclaim inode pages on demand |
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On Wed, 10 Aug 2005, Andrew Morton wrote:
> Mel Gorman <mel@csn.ul.ie> wrote: > > > > 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? > > They're just anonymous pages, aren't they? But you said "pages that are > being used for inodes". Confused. >
So am I, I'm missing something really stupid.
What I have is the following;
1. Add a new flag GFP_INODE to mark inode pages 2. Add a GFP_INODE to the flags passed to mapping_set_gfp_mask() in fs/inode.c#alloc_inode(). This means that the page allocator will now know when it is allocating pages for inodes 3. Added a PG_inode flag for page->flags which will flag all pages that were allocated for inodes
(Note, I don't intend to use this flags in the long term, I've added them for investigation purposes).
I later linearly scan the mem_map looking for pages that can be freed up (usually LRU pages). I was expecting any page with PG_inode set to have a page->mapping but not all of them do. It is the pages without a ->mapping that are confusing the hell out of me.
-- Mel Gorman Part-time Phd Student Java Applications Developer University of Limerick IBM Dublin Software Lab - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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