Re: [PATCH]: VM 7/8 cluster pageout

[Andrew Morton <akpm@osdl.org>]

Nikita Danilov <nikita@clusterfs.com> wrote:
>
> Andrew Morton writes:
>   > Nikita Danilov <nikita@clusterfs.com> wrote:
>   > >
>   > > Andrew Morton writes:
>   > >  > Nikita Danilov <nikita@clusterfs.com> wrote:
>   > >  > >
>   > >  > > Implement pageout clustering at the VM level.
>   > >  > 
>   > >  > I dunno...
>   > >  > 
>   > >  > Once __mpage_writepages() has started I/O against the pivot page, I don't
>   > >  > see that we have any guarantees that some other CPU cannot come in,
>   > >  > truncated or reclaim all the inode's pages and then reclaimed the inode
>   > >  > altogether.  While __mpage_writepages() is still dinking with it all.
>   > > 
>   > > Ah, silly me. Will __iget(page->mapping->host) in pageout_cluster() be
>   > > enough? We risk truncate on matching iput(), but VM scanner calls iput()
>   > > on inodes with ->i_nlink == 0 already (from shrink_dcache()).
>   > 
>   > I have vague memories about iput() in page reclaim causing deadlocks or
>   > some other nastiness.  Maybe not.
> 
>  Aren't you talking about
> 
>  http://marc.theaimsgroup.com/?t=108272583200001&r=1&w=2
> 
>  by any chance?

Nope, this all happened in the early 2002 timeframe.
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