Re: [patch 10/19] No Reclaim LRU Infrastructure

KOSAKI Motohiro
2008-01-15T00:06:56Z

Hi Lee-san

> > > +config NORECLAIM
> > > + bool "Track non-reclaimable pages (EXPERIMENTAL; 64BIT only)"
> > > + depends on EXPERIMENTAL && 64BIT
> > > + help
> > > + Supports tracking of non-reclaimable pages off the [in]active lists
> > > + to avoid excessive reclaim overhead on large memory systems. Pages
> > > + may be non-reclaimable because: they are locked into memory, they
> > > + are anonymous pages for which no swap space exists, or they are anon
> > > + pages that are expensive to unmap [long anon_vma "related vma" list.]
> >
> > Why do you select to default is NO ?
> > I think this is really improvement and no one of 64bit user
> > hope turn off without NORECLAIM developer :)
>
> This was my doing. I left the default == NO during
> development/experimemental stage so that one would have to take explicit
> action to enable this function. If the feature makes it into mainline
> and we decide that the default should be 'yes', that will be an easy
> change.

Oh I see.
I will help testing too for it merges to mainline early.

thanks.

- kosaki