Re: userspace pagecache management tool

[Andrew Morton]

On Sat, 3 Mar 2007 21:35:59 -0500 "Lee Revell" <rlrevell@xxxxxxxxxxx> wrote:

> On 3/3/07, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
> > But yes, updatedb's pagecache usage will be mainly metadata, and this tool
> > doesn't address metadata pagecache, although it could do so.
> >
> 
> With no kernel changes?  How?  I can't find an equivalent API to
> posix_fadvise() for metadata.
> 

We can use mincore and fadvise against /dev/sda1, too.

mincore's linear search would hurt but you could just run fadvise
regularly.  A lot of the blockdev pagecache is pretty useless anyway: we've
already copied it much of it into dentries and inodes, and some of ext2/3/4's
pagecache is already pinned by the fs.

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