> -----Original Message----- > From: Minchan Kim [mailto:minchan@xxxxxxxxxx] > Sent: Friday, December 19, 2014 9:05 AM > To: Wang, Yalin > Cc: 'Konstantin Khlebnikov'; 'Kirill A. Shutemov'; 'Andrew Morton'; 'linux- > kernel@xxxxxxxxxxxxxxx'; 'linux-mm@xxxxxxxxx'; 'linux-arm- > kernel@xxxxxxxxxxxxxxxxxxx'; 'n-horiguchi@xxxxxxxxxxxxx' > Subject: Re: [RFC] MADV_FREE doesn't work when doesn't have swap partition > > On Thu, Dec 18, 2014 at 11:50:01AM +0800, Wang, Yalin wrote: > > I notice this commit: > > mm: support madvise(MADV_FREE), > > > > it can free clean anonymous pages directly, doesn't need pageout to > > swap partition, > > > > but I found it doesn't work on my platform, which don't enable any > > swap partitions. > > Current implementation, if there is no empty slot in swap, it does instant > free instead of delayed free. Look at madvise_vma. > > > > > I make a change for this. > > Just to explain my issue clearly, > > Do we need some other checks to still scan anonymous pages even Don't > > have swap partition but have clean anonymous pages? > > There is a few places we should consider if you want to scan anonymous page > withotu swap. Refer 69c854817566 and 74e3f3c3391d. > > However, it's not simple at the moment. If we reenable anonymous scan > without swap, it would make much regress of reclaim. So my direction is > move normal anonymos pages into unevictable LRU list because they're real > unevictable without swap and put delayed freeing pages into anon LRU list > and age them. > I understand your solution, sounds a great idea! When this design will be merged into main stream? Thanks. ��.n������g��� �a��� �&ޖ)���)��h���&������梷���� �Ǟ�m������)������^�����������v���O��zf������