Christoph Hellwig <[email protected]> wrote:
>
> On Thu, Dec 29, 2005 at 05:54:08PM +0800, Coywolf Qi Hunt wrote:
> > 2005/12/2, [email protected] <[email protected]>:
> > >
> > > The patch titled
> > >
> > > drop-pagecache
> > >
> > > has been added to the -mm tree. Its filename is
> > >
> > > drop-pagecache.patch
> > >
> > >
> > > From: Andrew Morton <[email protected]>
> > >
> > > Add /proc/sys/vm/drop-pagecache. When written to, this will cause the kernel
> > > to discard as much pagecache and reclaimable slab objects as it can.
> > >
> > > It won't drop dirty data, so the user should run `sync' first.
> > >
> > > Caveats:
> > >
> > > a) Holds inode_lock for exorbitant amounts of time.
> > >
> > > b) Needs to be taught about NUMA nodes: propagate these all the way through
> > > so the discarding can be controlled on a per-node basis.
> > >
> > > c) The pagecache shrinking and slab shrinking should probably have separate
> > > controls.
>
> d) it is a total mess.
Rubbish.
> A lot of code
295 bytes.
> for something that you shouldn't do
> except for benchmarking.
Sure. It's a debugging feature.
> If people see problems where pagecache data isn't
> dropped enough we should fix the VM instead of adding code that just bloats
> the kernel more.
It's useful for debugging VM problems, too.
I'm not fussed, really - it's useful for kernel developers and testers. If
we're so worried about a very small amount of not-at-all-messy code then we
can stick it under CONFIG_DEBUG_VM.
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