Messages in this thread | | | Date | Sat, 3 Mar 2007 20:35:56 -0800 | From | Andrew Morton <> | Subject | Re: userspace pagecache management tool |
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On Sat, 3 Mar 2007 21:35:59 -0500 "Lee Revell" <rlrevell@joe-job.com> wrote:
> On 3/3/07, Andrew Morton <akpm@linux-foundation.org> 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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