Re: [PATCH v5 00/12] MADV_FREE support

On Thu, Jan 28, 2016 at 08:16:25AM +0100, Michael Kerrisk (man-pages) wrote:

Hello Minchan,

On 11/30/2015 07:39 AM, Minchan Kim wrote:

quoted

In v4, Andrew wanted to settle in old basic MADV_FREE and introduces
new stuffs(ie, lazyfree LRU, swapless support and lazyfreeness) later
so this version doesn't include them.

I have been tested it on mmotm-2015-11-25-17-08 with additional
patch[1] from Kirill to prevent BUG_ON which he didn't send to
linux-mm yet as formal patch. With it, I couldn't find any
problem so far.

Note that this version is based on THP refcount redesign so
I needed some modification on MADV_FREE because split_huge_pmd
doesn't split a THP page any more and pmd_trans_huge(pmd) is not
enough to guarantee the page is not THP page.
As well, for MAVD_FREE lazy-split, THP split should respect
pmd's dirtiness rather than marking ptes of all subpages dirty
unconditionally. Please, review last patch in this patchset.

Now that MADV_FREE has been merged, would you be willing to write
patch to the madvise(2) man page that describes the semantics, 
noes limitations and restrictions, and (ideally) has some sentences
describing use cases?

Hello Michael,

Could you review this patch?

Thanks.